Cold plunge buying basics: chillers, capacity, power and total cost

Last updated Oct 17, 2026. Figures come from our nightly price checks, as of the date shown in each section.

Cold plunge tubs are becoming a common add-on to home saunas, and they’re the next category we plan to track. We don’t publish cold plunge price pages yet, so this guide is about what to compare rather than which tub costs what. Where we give numbers, they come from listings we saw at the sauna stores we already check. We call that out each time.

As always, we stick to equipment, specs and buying logistics. We don’t make claims about health effects, and we don’t repeat brands’ claims.

What we’ve seen so far

On October 17, 2026:

• 12 of the 20 sauna stores we track also listed cold plunge products: tubs, chillers, accessories and sauna-plus-plunge bundles. We set aside 103 cold-plunge listings from our sauna catalog so they wouldn’t be mixed in with saunas.
• Standalone chillers (the cooling unit sold on its own) appeared in 8 listings at 5 stores, priced from $1,899 to $4,399.
• Tubs sold with a chiller (an integrated chiller or a tub-plus-chiller kit) appeared in 9 listings at 3 stores, from about $4,000 to $11,200.

We haven’t cleaned or matched these listings the way we do for saunas, so treat them as a rough picture of the range, not a price guide. When our cold plunge section launches, we’ll match models across stores and track prices nightly, just like saunas and massage chairs.

The main parts of a cold plunge

1. The tub. Shapes include barrels, rectangular tubs, ovals and “cuboid” boxes. Materials we saw listed include stainless steel, acrylic, PVC or plastic shells, cedar and thermally modified pine, and inflatable tubs. Things to compare:

• Interior dimensions and depth: can you sit with water at the height you want? Check against your height.
• Water capacity (gallons): affects fill time, chiller sizing and weight. Some listings state it (for example “85 gal”).
• Insulation and lid: a well-insulated tub with a fitted lid holds temperature better, so the chiller runs less. Lids are sometimes sold separately.
• Indoor or outdoor rating: and what the warranty requires outdoors.

2. The chiller. The refrigeration unit that cools (and on some models heats) the water and usually runs the pump. Things to compare:

• Cooling capacity: often given in horsepower (for example “1HP”). Higher capacity cools a given volume faster, or reaches lower temperatures in warm weather. Check the maker’s stated lowest temperature and the ambient temperature it assumes.
• Cooling only or cooling and heating: several chillers we saw are listed as “Cold/Heat.”
• Controls: a built-in display, or app or Wi-Fi control.
• Noise and placement: chillers have compressors and fans. Check the stated noise level and the clearance needed for airflow.

3. Filtration and sanitation. Most systems pump water through a filter. Some add UV or ozone. Compare filter type, how often replacements are needed, the replacement cost, and what the maker recommends for keeping the water clean.

Power and electrical

• Chillers vary in their electrical needs. Some are designed for a standard household 120V outlet, while others need more. Check the stated voltage and amps, and whether a dedicated circuit or GFCI protection is needed.
• Outdoor setups may need a weatherproof outlet near the tub.
• Running costs depend on chiller power, insulation, lid use, and the air temperature around the tub. The kW × hours × your rate estimate gives an upper bound. Real use depends on how often the compressor cycles.

Water, weight and placement

• Weight: water weighs about 8.3 lb per gallon, so a 100-gallon tub holds roughly 830 lb of water before the tub and people. Indoors, check floor loading. Outdoors, use a level, solid base.
• Fill and drain: where will the water come from and go? A nearby hose bib and drain make upkeep much easier.
• Freeze protection: in cold climates, check how the system handles freezing temperatures when it’s off or idle.

Total cost checklist

Like saunas, the listed price is often a starting point:

Bundles with saunas

Several sauna stores sell sauna-plus-plunge bundles. They can be convenient, but compare the bundle total against buying each piece separately. Make sure the plunge in the bundle has the chiller, lid and capacity you want. The general advice in how to tell if a sauna sale is real applies here too: compare-at prices on bundles are just as unverified as on single items.

Questions to ask before you buy

1. What’s the lowest stated water temperature, and at what room or outdoor temperature?
2. Is the chiller included, and what’s its cooling capacity?
3. What electrical service does it need?
4. What’s the water capacity, and what does it weigh full?
5. Indoor, outdoor, or both, and does the warranty change?
6. What’s the warranty on the chiller vs the tub, and who handles service?
7. What does filtration involve, and what do replacement parts cost?

When will we track cold plunges?

After saunas and massage chairs, cold plunges are next on our list. Sign up for the weekly email to hear when the section goes live. Meanwhile, see what home saunas actually sell for on our sauna pages.

Where these numbers come from

Listings seen in the public product data of the 20 sauna stores we check nightly, on October 17, 2026. We set cold plunge items aside from our sauna catalog, and we haven’t matched or cleaned them yet. The 8.3 lb-per-gallon figure is the standard approximate weight of water.