Cold Plunges With a Chiller Included: Verified Specs Compared

The value outlier: Inergize Elite Tub, $2,990

At $2,990 against a stated $3,990 regular price, this is the cheapest verified tub with an integrated chiller in our catalog by roughly $600. It runs 37°F to 104°F on 0.8 HP with four-stage filtration — ozone at 400 mg/hr, strainer, 20-micron filter and air filter — flowing 348 GPH.

The compromises are footprint and disclosure. The full installation with the chiller measures 89 by 41.5 inches, and the interior is 45 inches long, so this is a seated tub. Inergize does not publish a water capacity, which we have left blank.

The horsepower-per-dollar leader: Redwood All-In-One, $6,999

The Alaskan All-In-One Kit pairs Canadian Thermowood over a moulded acrylic liner with a 1.5 HP Balboa Clim8zone Deluxe dual chiller/heater, 37°F to 104°F, 104 gallons, and built-in UV sanitation. It is the only unit in our catalog with a named third-party chiller rather than an unbranded OEM unit — Balboa is a known spa-equipment manufacturer, and being able to identify the component is worth something for parts and service over a decade.

Redwood also states plainly that the UV system does not remove the need for routine water testing, chemical balancing and filter cleaning. That is a more honest line than the category usually offers.

The Plunge ladder

Plunge's four chiller-equipped tubs form a clean progression: the Pop-Up at $3,590 (upright, ~95 gallons, 1/2 HP, 39°F), the Air at $4,390 (lie-down, 105 gallons, 1/2 HP, 39°F), the Evolve XL at $5,590 (hard-shell, 105 gallons, 37°F) and the All-In Gen 2 at $7,990 (hard-shell, 105 gallons, 0.75 HP, 37°F). All four were listed at discounts from stated regular prices when we checked.

Two details matter across the range. The inflatables reach 39°F while the hard-shells reach 37°F, so the format genuinely affects the floor. And the 104°F heat mode is a $400 option on the Pop-Up and Air rather than standard equipment — a distinction easy to miss when comparing temperature ranges across brands.

Plunge publishes rate-of-change figures for the Evolve XL (8–10°F per hour cooling, 4–5°F per hour heating) but not chiller horsepower, while publishing horsepower but not rate for the All-In Gen 2. You cannot directly compare the two on either axis, which is frustrating on a single brand's own lineup.

The stainless tier

The Sun Home Cold Plunge Pro at $13,999 is 316-grade stainless with foam-injected insulation and a LineX coating, 150 gallons, 1 HP, and a three-step automatic sanitation loop — ozone, a UV chamber and a 20-micron filter — cycling the full tank every ten minutes. That is the fastest published turnover in our catalog, marginally ahead of Plunge's fifteen minutes on the All-In Gen 2.

Read the interior dimensions before you read the price: 47.4 inches long inside a 78-inch exterior. Despite the footprint, this is a seated tub. The Cold Plunge Pro Apex at $14,999 goes to 180 gallons, but Sun Home publishes no dimensions, chiller horsepower or warranty on its page, which is a meaningful gap at that price.

What the warranties tell you

• Plunge Air — 90 days on the tub, 1 year on the chiller. The shortest shell coverage in this catalog.
• Plunge Pop-Up, Evolve XL, All-In Gen 2, Inergize, Sun Home, Redwood — 1 year, with paid extensions offered by Inergize ($299 for three years, $400 for five) and Sun Home.
• Polar Monkeys Brainpod 2.0 — 2 years base, double the category norm, with extensions at $899 and $1,199.
• Renu Therapy Cold Stoic 3.0 — 5 years on the body, 1 year on the chiller. The longest shell coverage above $10,000.
• BlueCube C1 — 3 years residential, 10 years on tub and frame. Built for commercial duty.

Frequently asked questions

What is the cheapest cold plunge with a chiller included?

The Inergize Elite Tub at $2,990 in our verified catalog. Below roughly $3,000 every option we could verify is ice-cooled.

Do chiller tubs also heat?

Many do, but check whether it is standard. Inergize (37–104°F), Redwood's All-In-One (37–104°F), Renu Therapy (37–104°F) and Sun Home's Horizontal (32–107°F) include it. On the Plunge Pop-Up and Air the 104°F heat mode is a $400 option.

Does a colder minimum temperature mean a better chiller?

No. The $16,500 BlueCube C1 publishes 41°F, the warmest minimum of any chiller unit here, while running a 13,600 BTU commercial motor. Sustained performance under heavy use and low-water-temperature capability are different engineering targets.