Most people who build a cold plunge do it for the same reason: they want a set temperature on demand without hauling heavy bags of ice to the garage every morning. A water chiller solves that in a way ice never can. The unit pumps water out of your tub, runs it across a chilled refrigeration coil, and returns it at a thermostat-controlled temperature, usually somewhere between 37 and 45 degrees Fahrenheit, all day long.
Finding the best water chiller for a cold plunge tub is less about raw horsepower than most product pages suggest. It is about whether the unit can hold temperature in the air you actually live in, whether the fittings match the tub you already own, and whether the seller still answers the phone in year three. We compared ten chillers for this guide, weighing published capacity, control options, filtration, warranty length and the share of negative reviews behind each listing.
The short version: a 1/3 HP chiller handles the overwhelming majority of home setups, a 1/2 HP unit earns its place only in hot climates or uninsulated tubs sitting in direct sun, and anything above 1 HP is mostly about volume rather than colder water. We explain the sizing math in detail further down, including why a bigger compressor does not produce a lower temperature.
We refreshed this guide for 2026, and every temperature, wattage, capacity and rating below comes straight from the manufacturer listing and the current customer review history.
Table of Contents
- Top 3 Picks Best Cold Plunge Water Chillers in 2026
- Best Water Chillers for Cold Plunge Tubs at a Glance (September 2026)
- Which Water Chiller Is Best for a Cold Plunge Tub?
- How We Picked These Chillers
- 1. Active Aqua 0.10 HP Water Chiller – The Most Proven Small-Tub Chiller
- 2. AS ColdPlunge 1/3 HP – The Best Value All-In-One Chiller Kit
- 3. The Pod Chiller 2.0 – App Control and the Heaviest Filtration Here
- 4. JUGRFIT 121-Gallon Tub and Chiller Bundle – The Best Rated Complete Setup
- 5. PlungeFit Pro 1/2 HP – A Drop-In Chiller With No Plumbing at All
- 6. 1stplunge 148-Gallon Ice Bath Kit – The Only Pick With a Published Decibel Figure
- 7. 2/3 HP Tub and Chiller Set – Fast Cooling With a 24-Month Warranty
- 8. PlungeFit 1 HP – The Highest Capacity Chiller for Oversized Tubs
- 9. FADHOLE 1/3 HP – An Entry-Level 1/3 HP With No Detractors
- 10. 1stplunge 1/3 HP – A Straightforward Fridge-Style Chiller
- How Big a Chiller Do You Need? Sizing by Gallons and Horsepower
- Can an Aquarium Chiller Cool a Cold Plunge?
- Noise, Sanitation and Outdoor Durability
- Reliability, Failure Modes and Compressor Noise
- What a Cold Plunge Chiller Costs to Run
- Plumbing and Fittings: What You Need to Connect a Chiller
- Frequently Asked Questions
- What is the best chiller for a bathtub cold plunge?
- What size water chiller do I need for a cold plunge?
- Do I need a chiller for a cold plunge?
- Can I use an aquarium chiller for a cold plunge?
- Why is my cold plunge chiller making a loud noise?
- What are the most common problems with cold plunge chillers?
- Do I need UV or ozone in a cold plunge chiller?
- What does Joe Rogan use for cold plunge?
- The Verdict: Which Cold Plunge Chiller to Buy in 2026
Top 3 Picks Best Cold Plunge Water Chillers in 2026
Active Aqua 0.10 HP Chiller
- 1020 BTU cooling capacity
- Pure titanium evaporator
- Digital control with Boost function
- Built for 10-40 gallon setups
AS ColdPlunge 1/3 HP Kit
- Cools to 42F
- Built-in pump and washable filter
- Quick-connect fittings included
The Pod Chiller 2.0
- 37F rated minimum
- 145 GPH dual 20-micron filtration
- Bluetooth app control
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Best Water Chillers for Cold Plunge Tubs at a Glance (September 2026)
| Product | Specifications | Action |
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Active Aqua 0.10 HP Water Chiller with Boost
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Check Latest Price |
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AS ColdPlunge 1/3 HP Chiller Kit
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Check Latest Price |
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The Pod Chiller 2.0
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Check Latest Price |
121-Gallon Tub and 1050W Chiller Bundle
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Check Latest Price |
PlungeFit Pro 1/2 HP Drop-In Chiller
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Check Latest Price |
1stplunge 148-Gallon Ice Bath Kit
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Check Latest Price |
2/3 HP Tub and Chiller Set
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Check Latest Price |
PlungeFit 1 HP Cold Therapy Chiller
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Check Latest Price |
FADHOLE 1/3 HP Chiller
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Check Latest Price |
1stplunge 1/3 HP Ice Bath Chiller
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Check Latest Price |
We earn from qualifying purchases. CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED 'AS IS' AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
Which Water Chiller Is Best for a Cold Plunge Tub?
The best water chiller for a cold plunge tub is a 1/3 HP model with a built-in circulation pump, a rinse-and-reuse filter, and half-inch ports that match standard tubing. That combination covers tubs from roughly 50 to 150 gallons in most climates, installs without a plumber, and costs a fraction of what the headline horsepower numbers on big listings suggest you need.
Active Aqua 0.10 HP – the most proven name in small cold plunge chiller builds, with the deepest owner history in this group.
AS ColdPlunge 1/3 HP – best overall value, since the pump, filter, hoses, quick-connects and bathtub pump all come in the box.
The Pod Chiller 2.0 – best if you want phone control and a published flow rate for your filtration.
JUGRFIT 121-gallon bundle – best all-in-one buy, pairing a 1050W chiller with a drop-stitch tub rated to 37F.
PlungeFit Pro 1/2 HP – best when you refuse to run hoses, since this one drops straight into the water.
If you are still deciding, read the sizing section below before you buy. Choosing on horsepower alone is how people end up with a chiller that never reaches its rated temperature in August.
How We Picked These Chillers
Every product here comes from the same shortlist process. We started with listings that publish real specifications: cooling capacity or wattage, a rated minimum temperature, a rated tub volume, and a defined connection method. Vague listings that only say “professional grade” without a number were set aside regardless of how many reviews they carried.
On top of specs, we weighted four things heavily. First, the size of the review base, because a 4.8 average across fifteen buyers tells you very little about year three. Second, the share of one-star ratings, which is where compressor faults, leaking fittings and failed pumps show up first. Third, what is actually in the box, since a chiller without hoses, quick-connects and a pump is not a finished product. Fourth, warranty length and whether support commitments are published at all.
We did not measure these units ourselves on a bench. What we did was cross-read the listed specifications against what buyers report after living with the product, and flag anywhere the two disagree. Where a listing claims a capacity or a temperature, we report the claim and the review reality side by side rather than picking the flattering version.
1. Active Aqua 0.10 HP Water Chiller – The Most Proven Small-Tub Chiller
Active Aqua Water Chiller with Boost, 0.10 HP, 10-40 Gal, Cold Plunge
- 1020 BTU rated capacity
- 510 watts
- 10-40 gallon sizing
- 28 pounds
Pros
- Deepest owner history in the group at 334 reviews
- Titanium evaporator resists corrosion in fresh or salt water
- Boost function for fast pull-down
- Digital control holds setpoint accurately
- Fittings and remote included
Cons
- Smallest capacity here
- so it is not the choice for large tubs or hot climates
- No Wi-Fi or app control
- About 10 percent of ratings are one star
This is the chiller we kept coming back to while working through this category, mostly because of its review history. At 334 ratings it carries more feedback than the next two products in this guide combined, and that depth matters in a category where the top complaint in owner communities is a unit that fails within months. A 4.3 average with 72 percent five-star ratings is a realistic profile for a compressor chiller, not a curated one.
At 1020 BTU rated cooling capacity and 510 watts, it is a genuinely small machine, and the listing says so plainly: 10 to 40 gallons. That is a farm tank, a compact insulated tub, or a plunge setup in a climate-controlled room. The pure titanium evaporator is the detail that stands out to us, since titanium handles both fresh and salt water without the corrosion problems that eat cheaper coil materials over a few seasons.
The Boost function is the feature we would actually use daily. Owners of small tubs hit warm water every time somebody showers before a session, and Boost gives extra cooling power for exactly that recovery window. Digital control is straightforward, and the listing publishes a 32 degree temperature rating, which is the only numeric temperature figure the manufacturer gives for this model.
Two limits are worth stating plainly. There is no app or Wi-Fi control, so if your tub sits in a basement and you want to start cooling before you walk downstairs, you are walking downstairs first. And about 10 percent of ratings are one star, which for a 334-review listing is a real sample of unhappy owners rather than noise. The listed capacity ceiling is the more common complaint: people pairing it with tubs well past 40 gallons and concluding the chiller is faulty rather than undersized.
Who the Active Aqua 0.10 HP suits
This is the right pick for someone building their first cold plunge in a small insulated tub, in a climate where summer afternoons do not push past the high eighties. Owners on r/coldplunge report Active Aqua units running outdoors through Minnesota rain, sun and snow for more than two and a half years. That report was about a 1/4 HP sibling rather than this exact 0.10 HP model, so treat the durability as brand-level evidence rather than a guarantee for this listing.
It also makes sense for a second job. A chiller rated for 40 gallons can serve an aquarium, a reef tank or a hydroponic reservoir, and the titanium evaporator is the reason that dual use is safe. Our advice for this unit is simple: keep it indoors, keep the water volume below 40 gallons, and use the Boost button rather than lowering the setpoint to compensate for an oversized tub.
Who the Active Aqua 0.10 HP is wrong for
Skip it if your tub is a full-body immersion model in the 100-gallon range, or if it sits outdoors in a climate where ambient temperature regularly climbs past 100 degrees. Derating is steep in high heat, and a 1020 BTU machine loses a meaningful share of its output in that environment. The resulting complaint, which you will read repeatedly in reviews, is a chiller that simply never gets below 60 degrees no matter how long it runs.
Also skip it if remote control matters to your routine. There is no app, no scheduling, and no way to check the water temperature from your phone. For a small indoor setup that is an inconvenience. For an outdoor setup across the yard, it is a genuine limitation, and it is the single clearest reason to step up to one of the app-controlled models further down.
2. AS ColdPlunge 1/3 HP – The Best Value All-In-One Chiller Kit
AS ColdPlunge 1/3HP Cold Plunge Chiller, Ice Bath Water Chiller for Any Tub
- 1/3 HP compressor to 42F
- 600 watts
- 79-gallon rating
- 35 pounds
Pros
- Everything needed to plumb a tub or bathtub is in the box
- Washable metal filter means no recurring cartridge cost
- LED touchscreen with automatic hold
- Cools to 42F without ice
Cons
- 79-gallon capacity ceiling limits larger tubs
- About 12 percent of ratings are one star
If you want the single most complete first build, this is the one. The listing includes insulated hoses, quick-connect fittings, waterproof sealing tape and a submersible pump for a standard bathtub, which means you can connect to an existing tub or convert a tub you already own without a separate parts order. At 4.3 stars across 176 ratings it also has the second-deepest review base here.
Cooling is 1/3 HP pulling 600 watts, with a listed temperature of 42 degrees and a 79-gallon capacity rating. Owners generally describe the pull-down as steady rather than dramatic, which matches what you would expect from a fridge-style compressor. The digital touchscreen sets the temperature and holds it automatically, so the daily routine is dial it once and forget it.
The detail we appreciate most is the filter. It is a reusable washable metal mesh rather than a disposable cartridge, so there is no recurring consumable cost and no risk of a neglected cartridge wrecking the water. The built-in circulation pump handles the return line, and half-inch inlet and outlet ports are the common size for plunge tubing.
Support is a genuine differentiator here. The listing publishes a 1-year warranty and a commitment to respond within 24 hours, and that is more than most competitors in this price bracket offer in writing. The weakness is the 79-gallon ceiling. For a 100-gallon or larger tub, the chiller runs constantly trying to catch up, which raises your power bill and wears the compressor over time.
What makes the AS ColdPlunge kit the best value
It carries the second-deepest review base here, and the reception is consistently positive. Owners converting a bathtub single out the included accessories as the reason the install was simple, which is exactly the barrier that stops most people from starting a cold plunge in the first place.
The submersible pump deserves specific mention. Standard bathtubs have no dedicated inlet and outlet ports, so circulating water in and out requires pulling water from the drain end and returning it. Including that pump is the difference between a weekend project and a trip to a plumbing supply house. We would still add shutoff valves at both connections before you run it, since any fitting you can isolate is a fitting you can fix without draining the tub.
Where this kit falls short
Two things. First, 79 gallons is a real limit, and it is not a soft one. In summer, a 100-gallon tub on this chiller runs near continuously and still may not hold a plunge temperature, particularly with an uninsulated shell in direct sun. Second, about 12 percent of ratings are one star, and the complaints concentrate on delivery damage and early compressor faults rather than gradual performance fade.
If your tub is larger than about 80 gallons, or if you plan to run it outdoors through a hot summer, step up a size class. If you are working with a farm tank or a compact insulated tub, this kit has everything you need and nothing you do not.
3. The Pod Chiller 2.0 – App Control and the Heaviest Filtration Here
The Pod Chiller 2.0 for Cold Plunge Tubs, WiFi App Control, Cools to 37°F, 145 GPH Water Filtration & Circulation System, Energy Efficient Cold Therapy Chiller for Ice Baths & Recovery
- Cools to 37F
- 145 GPH dual filtration
- Bluetooth app
- 27 by 9 by 5 inches
Pros
- Rated to 37 degrees
- among the lowest minimums in the group
- 145 GPH dual 20-micron filtration with continuous circulation
- Bluetooth app for remote temperature control
- No specialized plumbing or tools required
Cons
- Lowest average rating here at 4.1 with about 12 percent one star
- Setup instructions and videos are confusing and inconsistent
- No published wattage
- BTU or weight
This is the pick for anyone who wants their cold plunge to be a scheduled appliance rather than a chore. Bluetooth app control lets you set and check water temperature from your phone, and at 27 by 9 by 5 inches the chassis is slim enough to tuck beside a tub without dominating a small room or shed.
Filtration is the standout specification. A 145 GPH circulation system with dual 20-micron filtration runs continuously, which is what allows the unit to extend the time between full water changes. Several picks in this guide rely on a simple mesh screen; this one is the only listing here that publishes a flow rate alongside its filter micron rating, and for anyone who shares a tub with a partner or runs a gym-style schedule, that difference shows up in fewer water changes per month.
Setup is advertised as hose-and-plug with no tools, and the rated minimum temperature is 37 degrees, among the lowest figures published in this guide. Owners who get it running report it holding somewhere in the low forties in practice, which is normal. A chiller rated to 37 degrees is rated at its best ambient conditions, and real-world water temperature in a warm tub under a summer sun lands a few degrees above the headline number.
The documentation is the weak point, and reviewers say so repeatedly. Several owners describe unclear manuals and multiple setup videos that contradict each other, and some found essential parts described as optional in the instructions. The practical advice from buyers is to watch a setup video end to end before assembly rather than following the printed guide, and to check the parts bag on arrival.
Why app control changes the routine
The value of remote control is not novelty, it is scheduling. A chiller that reaches temperature and then idles until you tell it otherwise is cheaper to run than one you leave cycling overnight, and an app lets you start the pull-down an hour before you plan to get in. For a household with irregular schedules, that is the difference between a chiller you use and a chiller that sits there.
The 145 GPH figure also matters for how fast water moves through the coil. Higher circulation means the entire tub volume passes over the chilled coil more often, which tightens the temperature spread between the water near the inlet and the water at the far end. In a large tub with a single user sitting still, better mixing means the water around your body is as cold as the sensor reads.
Reasons to pass on The Pod Chiller 2.0
It sits at the bottom of the rating range here at 4.1, with roughly 12 percent of ratings at one star. That is not disqualifying on its own, but it leaves a thinner margin than we would like, and the reviews suggest the complaints cluster in documentation and part identification rather than cooling performance.
There is also no published wattage, BTU figure or unit weight, which makes power budgeting and hot-climate sizing guesswork. If you live somewhere ambient temperature routinely exceeds 100 degrees, or if you need a hard number to plan a circuit, this listing does not give you one. In that situation, a spec-heavy 1/2 HP or 1 HP model is the safer purchase.
4. JUGRFIT 121-Gallon Tub and Chiller Bundle – The Best Rated Complete Setup
JUGRFIT 121-Gallon Luxury Pro-Grade Cold Plunge Tub with 1050W Water Chiller – Ice-Free At-Home Recovery, Built-In Filtration, Weatherproof & Durable
- 1050W chiller
- 121-gallon tub
- 37F minimum
- IPX4 weatherproof
Pros
- Best rating in the group at 4.8 with 95 percent five-star
- Drop-stitch walls hold firm and insulate
- WiFi control plus on-unit display
- Tub
- lid
- mat
- hoses and backpack all included
Cons
- The most expensive item in this group
- Initial cooldown from room temperature usually takes overnight
- Filter cap is plastic and can crack if dropped
This bundle has the highest average rating of anything we evaluated, 4.8 across 78 ratings with 95 percent at five stars. The tub itself is a serious piece of hardware too: drop-stitch fabric walls with metal fittings, sized at 53 by 32 by 24 inches for users up to 6 feet 5 inches. Owners compare the construction to high-end inflatable paddle boards and report the walls holding firm under heavy load.
The 1050W chiller is specced to pull a 121-gallon tub down to as low as 37 degrees with no ice, and the listing is honest that the first cooldown from room temperature typically takes an overnight run. After that, the thermostat cycles to hold. That expectation-setting matters more than it sounds, because buyers who try to plunge two hours after filling a fresh tub are disappointed by a machine that is working exactly as designed.
Insulation is the real engineering story. Drop-stitch walls reduce the heat load the chiller has to fight, which means less compressor runtime and a more stable water temperature. Long-term owners report holding 44 to 45 degrees in Florida heat, which is a genuinely useful data point given how punishing that climate is for this category.
The kit list is long. Tub and lid, chiller with built-in filter and circulation pump, hand pump, non-slip mat, hoses and valves, tub plugs, a GFCI power cable, a floating thermometer, a repair kit and a storage backpack. WiFi app control works alongside the on-unit display, and the chiller carries an IPX4 weather rating for rain and splashing from any direction. Support is US-based and owners repeatedly mention fast responses and free replacement parts.
Who should buy the complete bundle
Buy this if you are starting from nothing. If you already own a tub, skip to a standalone chiller and keep the money. The bundle wins on the specific combination of a 121-gallon insulated tub, a 1050W chiller and WiFi control, none of which you would assemble from separate parts without doing significant comparison work.
It is also the best option here for a warm climate, because the insulated walls cut the heat load before it reaches the compressor. Florida owners holding mid-forty degree water say exactly that. The packable design is a bonus we did not expect: it folds into the included backpack, so the whole setup can move to a rental or a gym without a truck.
What to know before you buy
It is the most expensive item in this guide, and for a fixed budget that money often buys more than you need. If you already have a tub and a hose kit, the same money spent on a higher-horsepower standalone chiller will serve you better than a bundle with a second tub.
Two smaller cautions. The overnight initial cooldown is real, so plan your first plunge for the day after you fill the tub. And the filter cap is a plastic part that owners report cracking when dropped or forced, so treat it as consumable and keep a spare on hand. Regular maintenance is expected here, with a weekly filter rinse and periodic full cleaning, which is more upkeep than a filter-only setup requires.
5. PlungeFit Pro 1/2 HP – A Drop-In Chiller With No Plumbing at All
Cold Plunge Chiller Pro, 1/2 HP Drop-in Ice Bath Water Chiller for Any Tub
- 1/2 HP 1200W
- 39F minimum
- 150-gallon rating
- 45 pounds
Pros
- Rated for 150 gallons at 1200W with a 39F minimum
- Drop-in design with no hoses or plumbing at all
- Wifi app control plus a large HD touchscreen
- Smart cooling cycles cut unnecessary run time
Cons
- Only 11 reviews
- so long-term durability is unproven
- About 19 percent of ratings are one star
- No published filtration or circulation details
Every other chiller in this guide sits beside the tub and pumps water through hoses. This one goes in the water. You set it on the tub floor, plug it into a 120V outlet, and it chills directly. For anyone who dreads the plumbing side of a cold plunge build, that single design decision removes the entire installation barrier.
The specifications are strong for a drop-in. A 1/2 HP compressor pulling 1200 watts, rated to 150 gallons, with a listed minimum of 39 degrees. Control comes through both a WiFi app, which handles temperature, on-off and scheduling, and a large top-mounted HD touchscreen for at-a-glance control. Smart cooling cycles are described as reducing unnecessary runtime, which is how you get a 1200-watt machine to behave quietly enough for a bedroom or a home gym.
The listed compatibility is unusually broad: cold plunge tubs, ice bath tubs, inflatable tubs, farm tanks and standard bathtubs. The 1-year warranty and stated 24-hour support response are comparable to the other kits at this level. Dimensions are 11.8 by 15.4 by 12.6 inches at 45 pounds, so it is portable enough to move between setups.
What gives us pause is the review base. Eleven ratings is the smallest in this group, and the 19 percent one-star share is the highest we recorded. A thin sample means both the good and the bad numbers are provisional. A brand-new listing with limited field history is a normal thing to buy, but it is a different risk than a 334-review unit.
When a drop-in design wins
Drop-in chillers make sense when the tub moves. If you take your plunge to a different property, set up a temporary station for a training block, or swap between an inflatable tub in the summer and a farm tank in the winter, a self-contained unit that needs no fixed plumbing is worth a lot. You also eliminate every leak point that a hose-and-connector setup creates.
The trade is circulation. Because the unit chills water in place rather than pumping from tub to coil and back, there is no forced flow through the whole body of water. In a 150-gallon tub with one person sitting still, the water directly around you can be colder than the water at the far end. Good for comfort in the moment, worse for uniformity across a group session.
Reasons to choose a plumbed chiller instead
If you are buying for a fixed installation that will run daily for years, hose-based units have a longer track record, and the parts that fail most often, pumps and connectors, are replaceable on them. A drop-in unit that develops a fault means the whole machine comes out of service.
The missing filtration details also matter. This listing publishes nothing about filtration or water circulation, so for a shared or multi-user tub you would be adding your own filter and maintenance plan on top. Given only 11 reviews, we would want a longer field history before committing a full installation to this design, even though the concept is genuinely appealing.
6. 1stplunge 148-Gallon Ice Bath Kit – The Only Pick With a Published Decibel Figure
Ice Bath Chiller & 148Gal Cold Plunge Tub Kit for Cold Recovery Therapy
- 1/3 HP to 42F
- About 40 dB
- 148-gallon tub
- 20-micron filter
Pros
- Only pick here with a published decibel figure at about 40 dB
- Built for 24/7 continuous operation
- 148-gallon insulated tub with 7-layer walls
- 20-micron external filter with easy-replace cartridges
Cons
- Chiller and tub come in two separate packages
- Tub is single-person capacity
- 4.2 average with about 8 percent one star
Compressor noise is the number one complaint in owner reviews across this entire category, and this is the only pick in the guide that publishes a decibel figure: around 40 dB, described as designed for continuous 24/7 operation. For a garage, home gym or bedroom-adjacent setup, having a number to compare against other units is worth more than a marketing adjective like “ultra-quiet.”
The bundle pairs that 1/3 HP chiller, rated to 42 degrees, with a 148-gallon oval tub built from 7-layer reinforced PVC, Oxford fabric and thick EPE insulation. That is the largest tub capacity among the bundles we evaluated, and the insulation matters for the same reason it does on the drop-stitch models: lower heat load, steadier temperature, less compressor runtime.
Water care is handled by a 20-micron external filter with replaceable cartridges plus a circulation pump. Cartridges cost more over time than a rinse-and-reuse mesh, but they capture hair, debris and fine particles more effectively, which is the right trade when two people use the same water. A smart touchscreen controller handles set temperature, and insulated hoses, valves and a submersible pump for standard bathtubs are included.
At 4.2 stars across 59 ratings, with 67 percent five-star, the reception is solid if not exceptional. Owners highlight the all-in-one value and the roomy tub. The recurring practical complaint is packaging rather than performance: the chiller and the tub are packed separately, so plan the build around the second box rather than assuming everything shows up together.
Why the noise figure matters more than it sounds
Almost no chiller in this category publishes a dB rating, which is why compressor noise is the complaint buyers cannot pre-screen. A 40 dB figure gives you something concrete to compare against a seller’s adjectives. A unit without a published number may be perfectly acceptable, or it may be the loud thing your partner complains about at 6 a.m.
If your plunge space is next to a bedroom, an office or a recording setup, treat this listing as the baseline to beat. Ask any other seller for a dB measurement before you buy from them, and note that “designed for 24/7 operation” implies a duty cycle built for continuous running rather than occasional bursts. The listed 20.8 pound chiller weight and compact 12.6 by 11.4 by 11.4 inch chassis also make it easy to relocate.
Limitations to plan around
The tub is single-person capacity despite the 148-gallon volume, so a household sharing a plunge session needs a second setup. The external filter cartridges are a recurring consumable cost that rinse-and-reuse designs avoid, and the split packaging complicates a same-weekend build.
One-year limited warranty is standard rather than generous, and the review base of 59 is moderate. Overall, this is the pick for someone who wants a complete, quiet, roomy setup and would rather not source a tub, hoses, filter and pump separately. If you already own a tub, the standalone chillers further down this list are the better value.
7. 2/3 HP Tub and Chiller Set – Fast Cooling With a 24-Month Warranty
Diveblast Cold Plunge Tub With Water Chiller, Pump and Filter – Low Consumption 2/3 HP Cold Plunge Chiller – Cools Water Down to 39°F
- 2/3 HP chiller
- 39F minimum
- 1500 GPH pump
- 24-month warranty
Pros
- Longest warranty in the group at 24 months
- covering pump
- filter and connectors
- Strongest pump here at 1500 GPH
- Reaches 39F from 90F water in 3-9 hours
- Runs only 20-30 minutes per hour once at temperature
Cons
- No published wattage
- BTU or unit weight
- Near the top of the price range for a chiller
- 45 reviews is thin for the money
Two specifications set this kit apart from everything else here. The first is the pump: 1500 GPH, far and away the highest flow figure in this group, and the kit includes a filter, insulated hoses, connectors and tools. The second is the 24-month warranty, which covers the chiller, the pump, the filter, the connectors and every included component rather than just the compressor.
That warranty detail matters more than it first appears. In this category the pump and connectors are the parts most likely to fail, and most warranties exclude them. Covering the whole system for two years effectively doubles your protection relative to a one-year parts-only policy, and it is the strongest reason to look at this kit if you intend to run it year-round.
Cooling performance is stated as 2/3 HP taking water from 90 degrees down to 39 degrees in 3 to 9 hours depending on ambient temperature and volume. That range is wide for a reason, and the variable is almost always the starting temperature of the water and how much sun the tub is taking. The efficiency claim we like most is that once at temperature, the chiller runs only 20 to 30 minutes per hour.
That duty cycle is the real running-cost story. A compressor that idles a third of the time at 1500 GPH of circulation is efficient in a way that a continuously cycling unit is not, and it reduces the wear that comes from hours of runtime. The ice pod tub is sized for users up to 6 feet 7 inches for full-body submersion, and the chiller chassis is a compact 12 by 15 by 12 inches.
Who benefits from a 1500 GPH pump
Flow rate is the spec people overlook and the one that shows up in daily use. High circulation means the whole body of water passes over the chilled coil repeatedly, so the water temperature is uniform rather than layered. In a large tub used by two people in sequence, or in a gym or spa setting with rotating users, uniform water is the difference between a consistent session and a cold spot that nobody wants to sit in.
It also shortens pull-down. Moving more water through the coil per minute accelerates the initial cooldown, which is why a high-flow setup can reach target temperature faster even before the compressor is at full tilt. Combined with the 20-30 minutes per hour runtime, this is a duty cycle worth comparing against every other unit in this guide.
What you give up for it
There is no published wattage, BTU rating or unit weight, so you cannot budget the circuit or plan the load precisely. It is also near the top of the price range for a chiller, and a 45-review base is thin for a product at this level. Buyers who waited on this kit should expect to read the negative reviews carefully rather than assuming a 4.2 average tells the whole story.
Because the tub and chiller are sold as a set, this is a poor choice if you already own a good tub. The chiller is the valuable half, and it is available on its own elsewhere. Buy this kit if you are building the whole system and want a two-year warranty on every part of the water path.
8. PlungeFit 1 HP – The Highest Capacity Chiller for Oversized Tubs
Cold Plunge Chiller, 1 HP Ice Bath Water Chiller for Cold Therapy Recovery
- 1 HP 2500W
- 37F minimum
- 230-gallon rating
- 73 pounds
Pros
- Rated for 230 gallons at 2500W
- the highest capacity in the group
- Stated pull-down of 100 gallons in 2-4 hours
- Caster wheels on a 73 pound unit
- External pump with 5 inch 20-micron cartridge
- LED controller with automatic on-off
Cons
- Sits at 4.1 stars with about 16 percent one star
- Heaviest and largest unit at 73 pounds
- Only 29 reviews for the price
If you are running a genuinely large tub, this is the most capable chiller in the guide on paper. One horsepower, 2500 watts, rated for up to 230 gallons, with a listed minimum of 37 degrees. The stated pull-down brings 100 gallons of water to 45 to 52 degrees in 2 to 4 hours. For a large insulated tub in a warm climate, that headroom is the difference between reaching plunge temperature and living with a lukewarm bath.
The package is well equipped. Three insulated hoses, connectors, an external pump with a 5 inch 20-micron replaceable cartridge, a submersible pump for standard bathtubs, tools and caster wheels. The LED controller runs automatic on and off cycling for hands-free 24/7 operation, and the 1-year warranty carries the same 24-hour support response seen on the other models in this range.
Now the honest part. This unit sits at 4.1 stars, and roughly 16 percent of ratings are one star, the highest negative share of any pick here. That is a polarized profile: 67 percent five-star, but a meaningful tail of unhappy owners. With only 29 reviews, the pattern is not yet well understood, and the reviews suggest results vary more than the specifications imply.
It is also the physical outlier at 73 pounds and 13 by 16 by 18.5 inches. The caster wheels are there precisely because of that weight, but it is not a unit you carry up stairs or reposition alone. Plan a permanent location with a dedicated outlet before you commit to it.
When one horsepower is actually justified
Large volume, hot climate, and poor insulation are the three conditions that justify this size. If you have a 200-gallon tub, a non-insulated shell, direct afternoon sun and summer ambient temperature above 100 degrees, a 1/2 HP unit will run continuously and still miss the mark. Headroom is the reason to oversize, not the desire for a colder setpoint, which every pick in this guide reaches within a few degrees of.
Note also that 2500 watts is a large continuous draw. On a standard 15-amp circuit, this is the kind of load that should have a dedicated outlet and a GFCI connection, and it is worth confirming your electrical setup before ordering rather than after.
Reasons to buy something smaller
Unless your tub genuinely exceeds 150 gallons, you are paying for capacity you will not use, carrying a 73-pound appliance, and taking on a 29-review reliability record where other picks here have hundreds. A 1/3 HP unit on a 120-gallon insulated tub will hold temperature in most climates at a fraction of the power draw, and it will have a far longer service record behind it.
If you do buy it, buy it for a big tub and read the negative reviews first. The polarizing 4.1 with a 16 percent one-star share is not a disqualifier, but it is a signal that this particular listing deserves more caution than the others.
9. FADHOLE 1/3 HP – An Entry-Level 1/3 HP With No Detractors
Cold Plunge Chiller for Ice Bath Tub, 1/3HP Water Chiller, Built-in Filter
- 1/3 HP to 42F
- 79-gallon rating
- 36 pounds
- Digital control panel
Pros
- Entry-level 1/3 HP cooling at 42F
- 4.5 average with zero one- or two-star ratings
- Integrated pump and washable metal filter
- Half-inch ports plus a submersible pump for bathtubs
- Insulated hoses
- connectors and sealing tape included
Cons
- Small review base at 17 ratings so long-term durability is unproven
- Widest listed dimensions relative to its size at 12.2 by 17.7 by 13.1 in for a 79-gallon unit
- No published wattage figure
This is the entry-level pick, and the rating distribution is what makes it interesting: 4.5 stars with 48 percent five-star and 52 percent four-star, and no one- or two-star ratings at all. A perfectly flat floor is unusual in this category, where most listings carry a double-digit one-star share. One caution belongs right next to that number, because 17 ratings is a small sample and a clean floor can change quickly.
The build follows the pattern that works. A 1/3 HP compressor cools to 42 degrees and holds the selected temperature automatically, rated for up to 79 gallons or 300 liters. The listed cooling rate is about 2 degrees per hour, so plan an overnight first pull-down rather than a same-afternoon plunge. An integrated circulation pump feeds a washable fine-mesh metal filter that catches hair, debris and particles, and you rinse it instead of replacing it.
Connections are half-inch inlet and outlet ports, and a submersible pump is included so the same chiller can serve a standard bathtub. The kit also includes insulated hoses, connectors and waterproof sealing tape, plus a digital control panel with automatic set-and-hold operation. The listing describes an optimized refrigeration system and insulated design intended to keep operating noise low, though no decibel figure is published.
Two practical notes. First, the dimensions are listed at 12.2 by 17.7 by 13.1 inches, which is wide for a 79-gallon chiller, so measure the space beside your tub before ordering. Second, there is no published wattage, which makes precise circuit planning impossible, though a 1/3 HP compressor at 110V falls comfortably within a standard household outlet.
When the budget pick is the right call
This is the honest starting point for a first cold plunge on a farm tank, a compact insulated tub, or a bathtub conversion in a moderate climate. The 79-gallon rating covers a standard tub filled to shoulder depth, and the 42-degree target is a legitimate plunge temperature. Nothing in the specification list is aspirational marketing; the numbers are ordinary and within reach.
The filter design saves real money over time. A washable metal mesh has no recurring cartridge cost, no risk of a neglected filter fouling the coil, and no supply chain dependency. Over a five-year life, that difference is meaningful for a machine you will run daily.
Where to slow down
Seventeen reviews is a very small base, and every reliability claim about this chiller is provisional. If you want a warranty backed by a long field history, you are buying a different product. And if your tub is uninsulated and outdoors in a hot climate, a 1/3 HP compressor at 79 gallons will be chasing temperature all summer without catching it.
Our advice for this pick: buy it for an indoor or shaded setup in the 50 to 79 gallon range, keep the tub covered when nobody is using it, and give the filter a rinse every week or two. Inside those boundaries, the value is genuinely difficult to argue with.
10. 1stplunge 1/3 HP – A Straightforward Fridge-Style Chiller
Cold Plunge Chiller, 1/3HP Ice Bath Water Chiller for Ice Bath Tubs
- 1/3 HP 600 watts
- 79 gallons to 42F
- 47.5 pounds
- LED touchscreen
Pros
- Rated to 42F for 79 gallons at 600 watts
- Rinse-and-reuse metal filter with no cartridges
- LED touchscreen with automatic hold
- Submersible pump and insulated hoses included
Cons
- One owner reports a lifespan of roughly one year
- Not the quietest unit in the group
- Dropping 10 degrees or more takes several hours
The selling point here is familiarity. This unit uses the same compressor technology as a household refrigerator or freezer, which means the failure modes, the duty cycle and the expected service life are ones with decades of precedent. For a first-time builder who has never owned a chiller, that predictability is worth something, and it is a different kind of reassurance from a listing full of proprietary claims.
Specification-wise it is a 1/3 HP at 600 watts rated for 79 gallons and 42 degrees, and owners report a temperature drop rate of about 5 degrees per hour in practice. The LED touchscreen sets and monitors the temperature and holds it automatically. Multiple size variants exist, and owners of the larger variant report cooling a 280-gallon plunge tub down ten degrees in well under an hour.
Upkeep is simple. The built-in metal filter traps debris, hair and sweat, and you rinse it and reuse it, which removes replacement consumables from the running cost entirely. Upgraded insulated hoses are included for faster cooling, less heat loss and better leak resistance, plus a submersible pump for home bathtub use and waterproof tape for sealing connections. Some owners integrate the unit with Alexa for scheduled run times.
Assembly is reported as straightforward, and one owner switched to this chiller after leak and connection problems with a competing brand. Support has been responsive when troubleshooting a pump issue. The listing carries a 1-year warranty with a stated 24-hour support response.
What owners like about this chiller
The filter and the assembly simplicity come up most often in positive reviews, along with quiet operation and simple controls. Owners who came from a competitor that leaked report the fittings and the included tape as the deciding factor, which is a small detail that saves real frustration.
For first-time builders, the LED touchscreen with automatic hold means there is one setting to choose and no protocol to learn. Set the temperature, walk away, and the unit does the cycling. That simplicity is worth more to a novice than a more granular control panel would be.
Where owners report problems
There is a two-star review citing roughly a one-year lifespan, and on a 22-review listing that single report is a meaningful share of the negative signal. It is one anecdote, not a pattern, and it is worth reading yourself before dismissing it.
Running noise is a recurring remark, and owners note that cooling fans only engage once the chiller runs warm, which confuses people expecting continuous airflow. If the chiller sits inside your house near a bedroom, check the dB figure on a competing listing before choosing this one. Taking several hours to drop ten degrees is normal for a fridge-style compressor and owners generally accept it, but it is a fact of the design, not a defect.
How Big a Chiller Do You Need? Sizing by Gallons and Horsepower
Size a plunge chiller by tub volume first, then adjust for ambient temperature, then pick horsepower. Start with the volume of water you will actually be sitting in, not the tub’s maximum capacity. A 150-gallon tub filled to 110 gallons is a 110-gallon cooling problem, and sizing to the printed capacity is the most common reason buyers end up with a chiller that never reaches its rated temperature.
As a working rule, a 1/3 HP chiller covers 50 to 100 gallons, a 1/2 HP covers 100 to 150 gallons, and 1 HP and above is for tubs past 150 gallons. Insulated tubs need less capacity than uninsulated ones of the same size, and hot climates need more. In very high ambient temperature, step up one size class regardless of volume, because a compressor that works at 72 degrees does much less at 105 degrees. A useful sanity check: take the tub’s stated capacity, subtract the empty space, and size to the water you will actually be sitting in.
One myth deserves killing outright. A bigger compressor does not produce colder water. Every unit in this guide is rated to a minimum somewhere between 37 and 42 degrees, and a 1 HP machine will not reach 34 degrees any more readily than a 1/3 HP machine will. What horsepower buys you is speed and heat-load headroom, not a lower setpoint. Paying for extra horsepower to chase a colder number is paying twice for the same outcome.
The corollary is that oversized units are not harmless. A 1 HP chiller on a 60-gallon tub cycles almost continuously, which costs more to run, shortens compressor life, and produces more noise than the situation requires. Match the machine to the job.
Can an Aquarium Chiller Cool a Cold Plunge?
No, not a real one. Aquarium chillers are designed to hold a range in the mid-sixties to low-eighties Fahrenheit, which is the correct band for reef and freshwater tanks. That range is nowhere near a plunge temperature. If a listing recommends an aquarium chiller for a cold plunge, the seller is describing a chiller that will produce cool water, not cold water.
There is one legitimate exception. Several picks in this guide use corrosion-resistant titanium evaporators, and the Active Aqua 0.10 HP is explicitly rated for aquariums, reef tanks and hydroponics. That means it is bidirectional: the same machine that can serve a small cold plunge can also serve a tank. What it does not mean is that an aquarium-rated chiller can plunge. Read the temperature range, not the use case.
If you already own a small aquarium chiller and want to test the idea cheaply, you can plumb it into a small tub and see what it achieves. Most owners who try this find the water settles well above plunge temperature within a few hours, and the chiller runs continuously trying to keep up.
Noise, Sanitation and Outdoor Durability
Compressor noise is the complaint that appears most often in owner reviews for this category, and the reason is that almost no seller publishes a decibel figure. The one exception in this guide is the 1stplunge 148-gallon kit at around 40 dB. Use that as your reference point. If your chiller will live inside your house near a bedroom, ask any seller for a measured number before buying.
On sanitation, there are two approaches. Rinse-and-reuse metal mesh filters, found on the AS ColdPlunge, FADHOLE and 1stplunge 1/3 HP, cost nothing to maintain and are simple, but they catch hair and debris rather than fine particles. External 20-micron cartridges, found on the 1stplunge kit, the JUGRFIT bundle and the PlungeFit 1 HP, filter more effectively and need replacing periodically. Neither approach sterilizes water, and neither should be treated as a substitute for changing the water.
For UV and ozone systems, treat claims skeptically. None of the ten chillers here publishes a verified UV sterilization or ozone sanitation specification, so if that is a requirement for your setup, verify it directly with the manufacturer before buying. Without an active sanitizer, biofilm on the coil becomes the real long-term risk, and the fix is maintenance: cover the tub when it is not in use, change the water on a schedule, and rinse the filter regularly.
On outdoor durability, only one unit in this guide carries a published weather rating: the JUGRFIT chiller carries an IPX4 rating for protection against rain and splashing from any direction. That is a meaningful differentiator for a tub installed outdoors year-round. Without a published rating, ask the seller directly, and remember that a unit marketed as outdoor-capable is not necessarily rated for direct sun and driving rain on a patio.
Reliability, Failure Modes and Compressor Noise
Reliability is where this category has the largest gap between marketing and experience, and it is the reason we weighted review count heavily when ranking. A 4.5 average across seventeen buyers is not a reliability signal. A 4.3 average across 334 buyers, with a documented one-star share, tells you something real about failure rates over years.
The failure patterns owners report cluster into four groups. Compressor faults are the most common, including units that fault within days of delivery and units that eventually stop holding temperature. One widely reported case in owner forums involves a premium all-in-one 1 HP unit that faulted after three days of operation, resolved by draining and resetting. That points at a control or protection issue rather than a dead compressor, and it is worth knowing before you blame the machine.
Fault codes and over-temperature errors are the second group. New units that throw repeated over-temperature codes or an E0 error usually indicate a probe, wiring or airflow problem rather than a dead compressor, and the fix is usually a reset, a clean filter and a check on the return airflow. Leaks and fittings are the third group, and these are almost always the installer’s problem rather than the manufacturer’s: over-tightened push fittings, missing washers, or a hose kinked behind the tub.
Compressor noise is the fourth. A hum or a low periodic click as the compressor cycles on and off is normal. A grinding, rattling or repeated hard click is not, and usually means a failing compressor or a loose mounting point. A sudden change in tone is the signal to act on, not the steady noise you grew used to.
On support, the difference between brands is stark. Owners of US-based brands with published response commitments report fast, human answers and free replacement parts. Owners of marketplace white-label units report long waits and slow warranty resolution. That pattern is why we treated warranty length and support clarity as a ranked criterion rather than an afterthought.
One structural point worth knowing: several premium cold plunge brands sell chillers built on the same OEM platform in different housings. Paying two or three times more for a logo rather than better hardware is a real and common outcome in this market, which is why we ranked on published specifications and review depth rather than brand story.
What a Cold Plunge Chiller Costs to Run
Running cost is easier to estimate than most product pages make it sound, because you already have the one number you need: the wattage. Multiply watts by the hours the compressor runs each day, divide by 1000 for kilowatt-hours, then multiply by your local utility rate.
Worked example on a 600 watt chiller. Running eight hours a day pulls 4.8 kWh a day, or roughly 144 kWh a month. A 2500 watt chiller running twelve hours a day pulls 30 kWh a day, or around 900 kWh a month. Those figures are pure arithmetic from the published wattage, and the gap between them is why duty cycle matters as much as horsepower.
This is where the 20 to 30 minutes per hour runtime on the 2/3 HP kit is worth paying attention to. A chiller that idles a third of the time is dramatically cheaper than one that runs continuously to chase a heat load it cannot win. Insulation is the other lever you control: a well-insulated drop-stitch or multi-layer tub reduces the heat the compressor has to remove, which shows up directly on the meter.
Against ice, the math is not close. A bag of ice handles a session or two, then has to be bought again, hauled, bagged and disposed of, and the resulting meltwater has to be bailed. A chiller converts a fixed purchase into a metered utility cost that stays predictable. If you are still buying ice twice a week, a chiller pays for the difference in convenience long before it pays for itself in electricity.
Budget for a dedicated outlet and a GFCI connection on any permanently installed chiller. Units above about 1500 watts deserve a circuit of their own, and none of them should share an extension cord run across a wet deck.
Plumbing and Fittings: What You Need to Connect a Chiller
Most chiller failures that get blamed on the manufacturer are fitting problems. A little planning up front prevents almost all of them.
First, decide between hose chiller and drop-in. Drop-in models go straight into the water and need no plumbing at all, which is why we recommend the PlungeFit Pro for moveable setups and anyone who does not want to run hoses. Everything else needs a supply and return line.
Second, match the port size. Most units in this guide use half-inch inlet and outlet ports, and plunge tubing is commonly sold in three-quarter-inch and one-inch. Buy adapters rather than forcing a mismatch, and check the port size before you buy hose.
Third, plan the return line into a standard bathtub. A normal tub has no dedicated fittings, so you need a submersible pump on the intake side to pull water from the low end and a return spout or hose at the high end. Kits that include a submersible pump save this step entirely, which is why the AS ColdPlunge and 1stplunge kits rate so well for bathtub conversions.
Fourth, use quick-connect fittings where the kit provides them, and add manual shutoff valves at both connections. Any fitting you can isolate is a fitting you can replace without draining the tub. Insulated hoses cut heat gain between the chiller and the water, and waterproof sealing tape on threaded connections prevents the slow drip that eventually ruins a subfloor.
Fifth, respect the return airflow. A chiller needs to pull air in and expel it. Boxing it into a closed cabinet or pushing it flush against a wall makes it run hotter, louder and shorter-lived. Leave clearance on the intake and exhaust sides per the manual, and keep the coil area free of condensation and debris.
Finally, plan the first fill. A fresh tub of room-temperature water can take hours, and a large tub can take overnight, before the chiller reaches a plunge temperature. Fill it, connect everything, set the thermostat, and come back tomorrow morning rather than expecting to plunge the same afternoon.
Frequently Asked Questions
What is the best chiller for a bathtub cold plunge?
A 1/3 HP chiller with a built-in circulation pump, a rinse-and-reuse filter and half-inch ports is the best fit for a bathtub conversion. Look for a kit that includes a submersible pump, since a standard tub has no dedicated inlet and outlet ports. The AS ColdPlunge 1/3 HP and FADHOLE 1/3 HP both include that pump, hoses and quick-connect fittings.
What size water chiller do I need for a cold plunge?
Size by the volume of water you actually use, not the tub’s maximum capacity. A 1/3 HP chiller covers 50 to 100 gallons, a 1/2 HP covers 100 to 150 gallons, and 1 HP is for tubs past 150 gallons. Insulated tubs need less, uninsulated tubs in direct sun need more, and step up one size class if your summer ambient temperature regularly exceeds 100 degrees.
Do I need a chiller for a cold plunge?
You need one if you plan to plunge more than once or twice a week without hauling and bailing ice, or if you want a temperature you can dial in rather than guess. You can skip one for occasional use in a mild climate, for a small insulated tub where ice lasts a session or two, or for a setup where bagging and storing ice is genuinely convenient. A chiller converts a repeated chore into a thermostat setting.
Can I use an aquarium chiller for a cold plunge?
No, not a typical one. Aquarium chillers are built to hold water in the mid-sixties to low-eighties Fahrenheit, which is far above any usable plunge temperature. A chiller rated for both aquariums and cold plunge use, such as the Active Aqua 0.10 HP with its titanium evaporator, is the exception because it is genuinely dual-rated rather than an aquarium unit being repurposed.
Why is my cold plunge chiller making a loud noise?
A hum or a soft periodic click as the compressor cycles is normal. Grinding, rattling or repeated hard clicking usually means a failing compressor or a loose mounting point. Before condemning the unit, check that the coil and fan have airflow, that the filter is not clogged, and that the chiller is not boxed in. A sudden change in tone is a reason to act; steady noise you have grown used to is not.
What are the most common problems with cold plunge chillers?
The recurring issues are compressor faults, including units that fault soon after delivery and units that stop holding temperature over time. Other common problems are repeated over-temperature or E0 error codes, which usually point to a probe, wiring or airflow issue rather than a dead compressor, and leaks at push fittings or threaded connections. Most fitting leaks trace back to installation rather than manufacturing.
Do I need UV or ozone in a cold plunge chiller?
Neither is essential if you change the water on a schedule and rinse the filter regularly. A 20-micron external cartridge catches fine particles better than a washable mesh screen, and a washable mesh costs nothing to maintain. None of the chillers in this guide publish a verified UV or ozone specification, so if active sanitation matters to you, confirm it with the manufacturer before buying rather than trusting a listing claim.
What does Joe Rogan use for cold plunge?
His setup is a dedicated stainless steel tub with an integrated chiller, not an ice bath, and several brands in this category market directly to that audience. What matters for your own purchase is the same principle: a chiller-controlled tub that holds a set temperature without ice handling. The exact brand is less important than verified cooling capacity, a rated minimum temperature and published warranty support.
The Verdict: Which Cold Plunge Chiller to Buy in 2026
After working through ten chillers, the best water chiller for a cold plunge tub depends on two questions: how many gallons of water are you sitting in, and how hot does your summer get. Answer both and the decision takes about a minute.
For most people, the best water chiller for a cold plunge tub is the Active Aqua 0.10 HP if your tub is small and insulated, because it carries by far the deepest owner history in this category, and 334 reviews of long-term use is worth more than any specification sheet. If your tub is in the 60 to 100 gallon range and you want everything in one box, the AS ColdPlunge 1/3 HP is the value pick, with the pump, filter, hoses and bathtub pump included.
Step up to the PlungeFit Pro 1/2 HP if you refuse to run hoses, to the 2/3 HP tub and chiller set if you want a two-year warranty covering the pump and filter, and to the PlungeFit 1 HP only if your tub genuinely exceeds 150 gallons. The JUGRFIT 121-gallon bundle is the single best-rated complete setup here at 4.8 stars and the strongest option if you are starting from nothing.
Whatever you pick, size it to your water volume, insulate the tub, cover it when it is idle, and give it a dedicated outlet. Get those four things right and the chiller will hold a plunge temperature for years without you touching a bag of ice.