Cold plunges

How to choose a cold plunge in six decisions

Most regret we hear about comes from buying in the wrong order: picking a tub from a photo, then discovering the outlet is on the wrong wall, the deck was never designed for a half ton of water, or the chiller cannot keep up with a Phoenix patio in July. Work through these six decisions in order and the shortlist builds itself.

First, the spot. Decide where the plunge will live, indoors, in a garage, on a slab or on a deck, and measure it, leaving room to lift the lid and reach the chiller's vents and filter. Second, the cooling method: ice only, a tub with a separate chiller, or an all in one system. Third, the fit: inside length, seated depth and whether you sit upright or lie back. Fourth, the chiller size for your climate and tub volume. Fifth, power: the amps the unit draws, the circuit it needs and how far the outlet is from the water. Sixth, water care: filtration, sanitation and how you will drain it.

Price comes last on purpose. Two plunges with similar starting prices can differ by a dedicated 20 amp circuit, a structural engineer's visit or a year of ice, and those costs only show up when the first five decisions are made.

Our own checklist, built from the questions buyers ask us before they order.

Ice only, tub plus chiller, or all in one

An ice only tub is an insulated shell you fill with water and ice. There is nothing to wire and almost nothing to break, which is why the lowest priced models on this page are in this group. The catch is the ice. Every session that starts from warm water needs a real quantity of it, and in summer the water warms back up between sessions. Ice only tubs suit people who plunge once or twice a week, who live where tap water runs cold, or who want to try the habit before committing.

A tub with a separate chiller is the flexible middle path. The chiller pumps water through a refrigeration coil and back into the tub, usually through an inline filter, and holds the temperature you set. You can pair a chiller with a stock tank, a barrel, a cedar tub or a purpose built shell, and replace either half later. Several tubs on this page are sold chiller ready, with molded or universal ports, and several chillers are sold on their own.

An all in one system puts the chiller, pump, filter and sanitizer in one insulated cabinet, often with an app. It costs more, but it is the closest thing to set and forget, and most models on this page run from a standard 120 volt outlet. Some also heat, which turns the same tub into a warm soak in winter.

Counted from the cooling and chiller lines on each maker spec sheet in our catalog. "Chiller optional" means the maker sells the same tub with or without a chiller.

The cooling table counts every product on this page by how its maker describes cooling. Ice only tubs cluster at the low end of the price range; all in one systems span the widest range because they include everything from compact inflatables with a small chiller to multi-person commercial tubs.

Read more: Best cold plunges · Best cold plunges under $5,000

Every cold plunge we list, side by side

This table is rebuilt from the maker spec sheets in our catalog every time the site is published, so it always matches the listings above. Use it to filter by cooling setup, water volume, chiller and power before you open individual product pages. Chillers sold on their own are in the electrical table further down.

Water, chiller, lowest temperature and power are quoted or read from each maker's spec sheet as last checked. Water weight is our math at 8.34 lb per gallon (the low end where a maker gives a range). A dash means the maker does not publish that figure on the page we checked, so we leave it blank rather than guess.

Read the water column with care. Some makers quote the volume at a recommended fill line and others at the brim, and a few give a range. Water weight is our math at 8.34 pounds per gallon, and it is the number your floor actually feels, before the tub and the person are added.

The lowest temperature is the maker's claim, usually under good conditions. Sun Home, for example, says the final temperature its chiller reaches depends on ambient conditions. Treat the figure as a ceiling on performance, not a promise for a south facing patio.

Fit: inside dimensions, posture and your height

Compare inside dimensions, never outside. A thick insulated wall or a cabinet that hides the chiller can add a foot to the footprint without adding an inch of room for you. Tall users should look at three numbers: inside length if you want to lie back, seated water depth if you want the water at your shoulders while sitting upright, and the maker's own height guidance.

Posture changes everything. An upright or vertical tub, like a barrel or a pod, takes the least floor space and the least water, and you sit with knees bent. A lay down tub lets you stretch out and recline, uses more water and more floor, and usually feels more natural to taller people. A few designs, like ReGen's Blast, sit in between with an upright seat in a longer tub.

If two people will share the plunge at the same time, look for a maker's stated two person or multi-person capacity rather than assuming a large tub fits two. Coldtub, for example, lists its Icebreaker as two people face to face.

Quoted from each maker's page. Height limits are the maker's own claims; seated depth and leg room vary, so tall buyers should compare inside dimensions too.

Maker height claims are the most generous number on any spec sheet. If you are close to a stated limit, ask the maker for the seated depth and inside length, and compare them with your own seated shoulder height and leg length.

Chiller size: horsepower, BTU and pull-down time

Chillers are marketed in horsepower, but horsepower describes the compressor, not how much heat it removes. The figure that predicts performance is cooling capacity in BTU per hour. Penguin Chillers, for example, rates its half horsepower unit at 5,000 BTU per hour and its high efficiency half horsepower at 5,750, so two chillers with the same horsepower label can do different amounts of work.

The physics is simple. One gallon of water weighs about 8.34 pounds, and removing one BTU drops one pound of water by one degree Fahrenheit. A 95 gallon tub therefore needs about 792 BTU removed for every degree it cools. Divide a chiller's rated BTU per hour by that number and you get the best case degrees per hour. The table below runs that math for a fresh fill from 65 degree tap water down to 39 degrees, using real chiller ratings and real tub volumes from this page.

Our physics math, not maker figures: gallons x 8.34 lb x 26 F (65 F tap water down to 39 F) = BTU to remove, divided by the chiller's rated BTU per hour. The figure in brackets is the ideal degrees per hour. It assumes no heat leaking in, so real times run longer, more so outdoors in summer or with the lid off. BTU ratings and volumes are from products on this page.

Two lessons stand out. Volume matters as much as chiller size: the same chiller that pulls a compact pod down in an hour or two needs most of a day for a large group tub. And the ideal figures are a floor, not a forecast. Heat leaks in through the walls, the lid, the plumbing and the air around the chiller, so real pull-down takes longer, especially outdoors in summer.

Maker figures line up with the math once those losses are counted. Plunge lists its All-In at 10 to 12 degrees per hour and its standard Air and Pod chillers at 4 to 6 degrees per hour, and says its Pro chiller cools about 12.5 degrees per hour and holds 37 degrees in 120 degree ambient air. When a maker publishes degrees per hour, prefer it to horsepower when you compare.

Climate decides how much margin you need. A plunge in a cool basement only has to fight a little heat gain, so a small chiller holds temperature with short run times. A plunge on a sunny patio in Las Vegas, Phoenix or Houston fights hot air and sun all day, so a larger chiller, a shade structure and a tight lid all pay off. ReGen states the same logic for commercial use: its half horsepower chiller for under 10 uses a day and its 1 horsepower chiller for 10 or more.

Read more: Half HP vs 1 HP chillers · Chiller power in Las Vegas · Chiller noise and placement

How much ice an ice only plunge really needs

Ice is the hidden running cost of an ice only tub, and the numbers are larger than most people expect. Melting one pound of ice absorbs about 144 BTU, and the melt water then absorbs one more BTU per degree as it warms to your target. Put that against the 8.34 BTU it takes to cool each gallon by one degree and you can work out the minimum ice for a fresh fill.

Our physics math: each pound of ice absorbs 144 BTU as it melts, plus 1 BTU per degree as the melt water warms to your target. Pounds of ice = gallons x 8.34 x degrees to drop / (144 + target minus 32). It ignores heat from the air, the tub walls and your body, so treat it as the minimum for one fresh fill. Volumes are real tubs from this page.

These are minimums for one fresh fill with no heat coming in from the air, the tub or your body. Real sessions need more, and summer tap water is the expensive case: dropping a mid size tub from 80 degrees to 50 can take well over a hundred pounds of ice. Melted ice also raises the water level, so leave room or drain a little before you add it.

This is why so many owners who start with ice add a chiller later. If you plunge most days, the ice math usually settles the question, and a chiller ready tub with ports keeps that upgrade simple.

Electrical draw and your circuit

Almost every cold plunge and chiller on this page runs on 120 volts, and most makers publish the amps or watts the unit draws while chilling. That number decides whether the plunge can share a circuit, needs its own, or needs a 20 amp circuit rather than a 15. Plunge, for example, requires a dedicated 120 volt, 15 amp circuit for several models. Coldtub specifies a 110 volt, 20 amp dedicated outlet. Chilly GOAT's Valaris contrast tubs need 240 volts at 50 amps and a licensed electrician, and Penguin's two and a half horsepower chiller runs on 208 to 240 volts.

A chiller may run for hours at a stretch, and the National Electrical Code treats any load expected to run three hours or more as a continuous load. A breaker serving a continuous load is sized at 125 percent of that load, which works out to keeping the load within 80 percent of the breaker: 12 amps on a 15 amp circuit, 16 amps on a 20 amp circuit. The table applies that check to every unit whose maker publishes a running draw.

Amps and watts are the maker's running figures. The last column is our math: the NEC treats a load that runs 3 hours or more as continuous and sizes the breaker at 125 percent of it, so a 15 A circuit carries 12 A continuously and a 20 A circuit 16 A. It is a planning check, not a substitute for the nameplate and your electrician.

Anything near or above 100 percent of the 15 amp column is a strong hint that the plunge wants a 20 amp circuit of its own, whatever else the circuit serves. Anything that shares a circuit with a freezer, a space heater or garage tools will trip breakers more often than one that does not. Your electrician sizes the actual circuit from the nameplate and installation manual for the exact model.

Read more: Cold plunge GFCI and electrical · GFCI keeps tripping · Sauna and cold plunge on one panel

GFCI and the National Electrical Code

The NEC does not use the words cold plunge. An inspector decides which existing category your setup fits, and that choice sets the rules. Recognized code trainers point out that the NEC's definition of a pool covers equipment used for swimming, wading, immersion or other purposes, so a cold plunge is generally read as a storable pool, a permanently installed immersion pool treated like a spa, or a self-contained spa. In every reading, plan on ground fault protection.

Sources: the 2023 NEC as quoted in Mike Holt's guides to Article 680 and 210.8, and Leviton's reprint of 406.9, as cited in our GFCI guide. These are secondary sources that quote NFPA 70. Your state or city may adopt a different edition with amendments, and your inspector has the final word.

Makers add their own rules on top. Plunge says to install the plug at least 5 feet from the water, readily accessible and visible from the tub, and prohibits extension cords for normal use or testing, warning that one can void the warranty. When a maker's distance and the code distance differ, use the stricter one, which is usually the 6 foot code figure.

A new outlet or circuit is permit work in most places, even when plugging a cord into an existing GFCI outlet is not. Our city guides list the permit rules we have checked.

Read more: Disconnect and the 5 foot rule · Arkansas GFCI rule under the 2026 NEC · Cold plunge permits in six cities

What a chiller costs to run

A chiller's running cost is its watts times the hours its compressor actually runs, times your electric rate. The watts are on the spec sheet. The hours are not, because they depend on climate, sun, lid use, target temperature and how often you refill, and no maker we list publishes a fixed hours-a-day figure. The first table lists the EIA's August 2026 average residential rates for several states. The second prices every chiller wattage on this page at two run time assumptions, 6 and 12 hours a day, so you can bracket your own case, using the Nevada, US and California rates.

Source: US Energy Information Administration, Electric Power Monthly, Table 5.6.A, August 2026. Your own bill's rate, including time of use pricing, is what counts.

Our math: watts x hours a day x 30 / 1,000 = kWh a month. Run hours are an assumption, because no maker we list publishes a fixed hours-a-day figure; log your own for a week. Rates are EIA average residential prices for August 2026 (12.72, 18.16 and 29.75 cents per kWh). Units that both chill and heat draw more when heating.

For a reality check, FjØRD estimates its Lux at about $13 to $17 a month, which sits at the low end of this table. The gap between the columns is the point: the same chiller can cost two to three times as much to run in a high rate state, and doubling the run hours doubles the bill. The cheapest efficiency upgrade is almost always the lid. Keep an insulated cover on whenever nobody is in the tub, shade the tub and chiller, and keep the vents clear.

Units that both chill and heat draw more when heating. Renu, for example, lists cooling and heating draws separately, and the heating figure is the larger of the two.

Read more: Chiller power and cost to run · NV Energy time of use

Weight, floors and decks

Water weighs about 8.34 pounds per gallon, so a mid size plunge carries most of a half ton before you add the tub and yourself. On a ground floor slab or a compacted gravel pad that is not a problem. On a wood deck, a balcony or an upper floor it is the first thing to check.

Total weight is the wrong number to look at. Decks are designed for load per square foot, spread across the whole surface like people at a party. The residential code designs decks for a 40 pound per square foot live load, and the American Wood Council's DCA 6 deck guide says plainly that concentrated loads such as those created by hot tubs are beyond its scope and require a design professional or other approved installation approach. A plunge does exactly that, parking its weight on a patch about the size of a doormat.

Footprint is from the maker's outside length and width (the Plunge Pop-Up as a circle from its stated diameter and the Ice Barrel 300 as a circle because its width and depth are equal on a barrel; some makers include the chiller in the footprint). Filled weight is the maker's figure. The 40 psf live load is the design figure for residential decks in the IRC and the American Wood Council DCA 6 guide, which says concentrated loads such as hot tubs are outside its scope and need a design professional. Our math, not a structural approval.

Every model in the table loads its footprint at well over the 40 psf a typical deck is designed for, and compact vertical tubs are the most concentrated of all because they stack the most water on the smallest base. That does not mean a plunge can never go on a deck. It means the framing under it needs to be designed for it, usually by an engineer or a builder working from the plunge maker's weight figures.

Indoors, think about water as well as weight. Plan for splashes, a mat or a sloped floor near a drain, and humidity in a closed room. A garage slab is often the easiest indoor spot because it handles both.

Read more: Cold plunge on a deck

Indoors, outdoors and winter

A chiller works by dumping the heat it pulls from the water into the air around it. Give it room to breathe. Penguin's owner material calls for at least 12 inches of open space on all sides and says not to enclose the chiller in a cabinet or let its hot exhaust recirculate, and SISU lists 12 inches of clearance around the three vents on its Drake. A chiller boxed into a closet or a tight corner runs longer, costs more and wears faster.

Outdoors, shade is worth more than it looks. Direct sun heats the water and the chiller's condenser at the same time. Cover the tub between sessions, keep sprinklers off the electrical connection, and keep the cord and outlet protected with an in-use cover.

In freezing climates, decide on a winter plan before you buy. Some systems can keep running through winter and some makers say to drain the chiller before freezing weather. Penguin lists an ambient operating range of roughly 37 to 100 degrees and says to drain the chiller before a freeze. Cold Creek lists freeze protection on its horizontal tub's chiller. If you will not run the system all winter, drain the tub, the chiller and the lines fully so nothing can crack.

Noise matters if the plunge sits near a bedroom or a neighbor's fence. Only some makers publish a sound figure, and they measure at different distances, so compare with care.

As stated by each maker. Makers measure at different distances, and some do not say how far away, so compare with care.

Read more: Cold plunge in winter · Setbacks from the property line

Water care: why cold water is not self cleaning

It is tempting to assume cold water stays clean on its own. Public Health Ontario's 2024 review of cold plunge tanks says otherwise. Many waterborne germs survive longer in cold water than in a warm pool: Giardia survival rises from about 14 days at 77 degrees to 77 days at 39 to 46 degrees, E. coli can survive and grow at temperatures as low as about 45 degrees, and Salmonella as low as about 41 degrees. The exceptions are Legionella, nontuberculous mycobacteria and Pseudomonas, which present the most serious risk at higher temperatures, which is one reason a plunge that also heats needs the same care as a hot tub.

Cold water also slows disinfectants down. Using Ontario's drinking water disinfection tables, Public Health Ontario shows how much longer chlorine needs to work at plunge temperatures. Its takeaway is that a higher chlorine or bromine residual can help offset the slower disinfection, and that small tanks carry more bathers per gallon than a pool, so dilution does little to help.

Source: Public Health Ontario, Frequently Asked Questions: Cold Plunge Tanks and Pools (October 2024), citing Ontario's Procedure for Disinfection of Drinking Water. Fahrenheit conversions are ours.

Public Health Ontario also describes what a recirculating tank should have: a primary treatment system able to destroy or remove viruses, protozoa and bacteria, which can be supplemented by residual chlorine, UV light and sub-micron filters. That matches how the systems on this page are built. Most combine a cartridge filter with ozone, UV or both, and many owners add a measured dose of spa sanitizer. Makers differ in the details: FjØRD says to replace its 50 micron filters monthly, Coldtub uses Dead Sea salt sanitation with a 1 micron antimicrobial filter, and ReGen's Blast Pro adds automatic pH and chlorine dosing.

Sanitizer and pH targets you can test for

The CDC's healthy swimming guidance publishes chlorine, bromine and pH targets for hot tubs, and the page we checked does not list separate figures for home cold plunges. Because cold water slows disinfection rather than speeding it up, the hot tub figures are a sensible floor, not a ceiling, and your plunge maker's manual comes first if it gives its own numbers. Test with strips or a kit, and test more often when more people use the tub.

Sources: CDC, What You Can Do to Stay Healthy in Hot Tubs (May 2025); Public Health Ontario, Cold Plunge Tanks and Pools (October 2024). Follow your maker's chemical compatibility list: some chillers use titanium heat exchangers that Primal Plunges says work with chlorine and chlorine free sanitizers, and others limit what you can use.

Change the water on a schedule. Public Health Ontario notes that some makers of smaller tanks publish approximate water change schedules tied to how much the tub is used. Follow yours, shorten it when guests use the plunge, and change the water sooner if it turns cloudy or smells.

Plan the drain before the first fill. Many cities let you drain dechlorinated water to landscaping but not to the street or a storm drain, and some ask you to use a sewer cleanout. Our drain guides list the rules we have checked by city.

Read more: Cold plunge water chemistry · Draining rules: Las Vegas area · Draining rules: five more cities

Temperature: what the public health guidance says

There is no single correct plunge temperature, and colder is not automatically better. The CDC's Model Aquatic Health Code, as summarized by Public Health Ontario, says water below about 70 degrees is considered cold by most people and lists a guideline range for cold water plunge tanks that sits well above the lowest settings many chillers advertise. Public Health Ontario adds that most observable physiological reactions to cold water peak at about 50 to 59 degrees or colder.

Source: CDC Model Aquatic Health Code 2023 Annex, as tabulated by Public Health Ontario, Cold Plunge Tanks and Pools (October 2024).

Many chillers on this page can go colder than that guideline range, and some advertise ice making. That is a capability, not a recommendation. Use a separate thermometer to check what the display says, start warmer and shorter than you think you need, and talk with your doctor before you start if you have a heart condition, high blood pressure, are pregnant or have other health concerns.

Cold water safety at home

Public Health Ontario describes how the body responds to cold water in phases. Typical home plunges are short, about 30 seconds to 2 minutes for casual users by its account, so the later phases are unlikely, but knowing them explains the house rules most makers print in their manuals.

Source: Public Health Ontario, Cold Plunge Tanks and Pools (October 2024). Timings are approximate and depend on water temperature, body composition, age and sex.

The practical rules follow from that table, and Public Health Ontario lists them for bathers: consult a physician first, adapt gradually in both temperature and time, enter slowly so cold shock can pass before your face goes under, focus on your breathing and avoid long breath holds, have someone nearby, and take care climbing out. It notes that pregnant women, people with pre-existing medical conditions and young children should generally avoid extreme water temperatures, and that alcohol, drugs and some medications reduce cold tolerance.

At home that means a locking lid when the plunge is not in use, especially with children or pets around. Many tubs on this page ship with a lockable or child safety lid; Desert Plunge, Cryospring and ReGen's OG all list one. It also means a stable step or handhold for getting out, and never plunging alone after a sauna session or a drink.

Delivery, setup and lead times

Read the delivery terms before you order, because they vary more than prices. Inflatable and drop-stitch tubs ship in a box and set up in minutes: Revive says its inflatables inflate and fill in about 15 minutes, and Primal Plunges says its Tundra inflates rigid in about five. Hard shell and all in one tubs usually travel by freight on a pallet. Coldtub includes curbside freight to the lower 48 and offers white glove delivery for an added $750.

Lead times range from in stock to months. Elemental Soak lists 8 to 12 weeks for its cedar tub, Sweat Kingdom 6 to 12 weeks for the Surge, and ReGen 2 to 4 weeks for the Blast. If you are planning around a pad pour or an electrician's visit, confirm the ship date first.

Measure the delivery path: every gate, step, door and turn between the truck and the final spot, with the tub's outside dimensions and its shipped weight in mind. A filled plunge cannot be moved, so set it where it will stay.

Read more: How shipping works · Returns

Warranty: read the tub and the chiller separately

Most plunges carry two warranties in one listing, one for the tub or shell and a shorter one for the chiller and electronics, and the difference matters because the chiller is the part most likely to need service. A few examples from the spec sheets on this page show the spread.

Quoted from the maker spec sheets in our catalog as last checked. Each maker's own warranty document governs.

Ask how a chiller failure is handled before you buy. Some makers ship a replacement unit and some ask you to ship yours back, which can mean weeks without cold water. Ask whether a cover, filters and a starter chemical kit are included, too: Qoolpod lists a starter chemical kit with its commercial model, and SISU includes a one year supply of filters with the Drake.

What it costs, from ice tub to group plunge

Starting prices on this page run from small ice only tubs to multi-person commercial systems. The table groups every model by starting price so you can see which cooling setups and makers sit in each band. Delivery, an electrician, a pad or platform, ice or electricity, filters and sanitizer come on top.

Starting price is the maker's lowest listed option as last checked. Delivery, an electrician, a pad or platform, and water care supplies are extra unless the maker says otherwise.

For most households the biggest swing in total cost is not the tub. It is whether you need a new circuit, whether the spot needs a pad or deck reinforcement, and whether you will be buying ice every week. Price those three before you compare tubs.

Questions to ask the maker before you order

These are the questions we ask on behalf of buyers who contact us. A maker that answers them in writing is usually a maker that will answer the phone when something goes wrong.

Our checklist.

How we choose which plunges to list

We list cold plunges and chillers from the companies that build them, never from resellers, and only from makers that publish real specifications. We record each maker's claims with the date we checked them, and the tables on this page are built from those records every time the site is published.

We show a Made in USA mark only on individual products where the maker states it in writing and we have that statement on file, never for a whole brand. Right now that applies to Coldtub's models, which Coldtub describes as 100% manufactured in the USA. Several other makers describe where they design, fabricate or assemble their tubs, and we quote that wording on the product page rather than turning it into a badge. We never write, copy or invent reviews.

Read more: American made cold plunges · Our standards