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Chilled plunge tub

Plunge Air

Cold Only (no heater add-on)

$5,490US price, checked Oct 13, 2026

Plunge's lowest-priced chilled tub, inflatable and app-controlled

Check price at Plunge Full review →

Chilled plunge tub

BlueCube C1 Cold Plunge Tub

60-inch Standard, Black cladding

$16,500US price, checked Oct 13, 2026

Handbuilt stainless sit-in tub that both chills and heats, 41–104°F

Check price at BlueCube Full review →

Criterion	Plunge Air	BlueCube C1 Cold Plunge Tub
US price	$5,490Checked Oct 13, 2026 · Price details in the review	$16,500Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$5,490 Incomplete known subtotal. Not included: installation, annual consumables, energy use.	$16,500 Incomplete known subtotal. Not included: installation, annual consumables, other annual costs, energy use.
Choose if	Anyone who wants Plunge's chiller and app at the lowest list price, with a 15 A circuit near a floor that can hold about 904 lb.	You want one stainless tub for cold plunges and warm soaks, indoors or out, and you have a free 120 V, 20 A circuit and a way to move a freight delivery from the curb.
Main trade-off	The tub is covered for only 90 days (the chiller gets 1 year), and Plunge doesn't publish enough to estimate running costs.	You pay $16,500 without a published footprint, water volume, weight or running cost, and changing your mind costs a minimum 25% restocking fee plus shipping.
Key specifications	Lowest stated temperature: 39°F / 4°C Water capacity: 105 gallons Chiller: 1/2 HP for the Air. Plunge rates the standard chiller at 4–6°F per hour and the Pro chiller at 8–10°F per hour. It doesn't say which one ships with Cold Only Electrical: 110–120 V, 15 A. A dedicated circuit is listed as a requirement and recommended in the FAQ. Built-in 15 ft cord. Wattage not published Weight: 28 lb without water, 903.7 lb with water. Chiller weight not published Water care: 20-micron filter plus ozone. Works with chlorine or non-chlorine maintenance Controls: Plunge app over 2.4 GHz Wi-Fi to set temperature and track sessions	Temperature range: 41–104°F with the chiller and heater. BlueCube says the C-line cools about 5°F per hour Chiller: 13,600 BTU (1.5 HP+) commercial chiller, rated to operate down to 20°F ambient Electrical: Dedicated 120 V, 20 A outlet with the included GFCI cord, or hardwired. Power draw not stated Water capacity and weight: Not stated by the manufacturer Circulation and sanitation: ¼ HP Iwaki magnetic-drive pump at 25.6 GPM for continuous circulation (RiverMode), with 20-micron filtration and automatic ozone Tub: Sit-in 14-gauge 316-L stainless steel, with immersion up to the neck Controls: iOS and Android app, plus nighttime lights
Exact variant	Cold Only (no heater add-on)	60-inch Standard, Black cladding
Dimensions	Tub 61 L × 32 W × 28 H in (outer). Plunge doesn't give inner dimensions. The standard chiller is 23 L × 14 W × 18 H in. Plunge also lists a Pro chiller at 28 L × 16 W × 17.5 H in. Leave 12 in of clearance behind the chiller, 12 in to the side and 6 in below. The Air is listed at 28 lb without water and 903.7 lb with water. The chiller's weight isn't published.	It's sold as a 60-inch sit-in tub with full-body immersion up to the neck. The interior is contoured at a 20° slope. The product page names 54-inch Mini and 60-inch Standard sizes, but the online store lists only the 60 size. BlueCube doesn't state exterior or interior dimensions, water capacity, or empty and filled weight on the pages reviewed.
Installation	It plugs into household power, but Plunge describes the requirement three ways. The product card lists 110 V/15 A. The electrical requirements call for a 120 V, 15 A dedicated circuit and mention a built-in 15 ft power cord. The FAQ says it uses a standard 110 V outlet and recommends a dedicated 15 A circuit with no other appliances on it. Setup, per the FAQ, means inflating the tub with the included pump, connecting two hoses, filling it with water and plugging in. Plunge gives the setup time as 15 or 20 minutes. In-home delivery doesn't include assembly, setup or connection to power or water. It's for indoor or outdoor residential use only.	It needs a dedicated 120 V, 20 A outlet, and a GFCI cord is included. You can hardwire the tub instead. BlueCube rates it for indoor and outdoor use and says the chiller operates down to 20°F ambient. Delivery is free curbside freight in the continental US, not in-home placement. BlueCube doesn't state plumbing, drain, floor-load or clearance requirements on the pages reviewed.
Materials	Plunge describes an inflatable warp-knit drop-stitch tub that's UV-resistant and insulated, with an insulated cover. The page's comparison cards contradict that. They list "fiberglass reinforced acrylic" for the Air and every other Plunge model.	The tub is 14-gauge marine-grade 316-L stainless steel with a contoured sit-in interior. It sits in a marine-grade plywood cabinet coated in Line-X polyurea, which BlueCube says adds UV resistance and insulation. Black is the cladding priced here, and white, grey, beige and uncladded cost the same. BlueCube also offers any Sherwin-Williams custom color, but the online store doesn't list a price for it. BlueCube's performance page says its plumbing is Schedule 40 PVC. That's a brand-wide statement, not a C1 spec. An insulated spa cover with child locks is included.
Warranty	The tub is covered for 90 days and the chiller for 1 year, according to Plunge's warranty note. Elsewhere the page is less clear. The comparison card lists a "1 year warranty," and the FAQ mentions a "1-year limited warranty" without separating tub and chiller. Coverage starts at delivery. You activate it by downloading the app and connecting the unit to Wi-Fi. It stays active only while the unit remains connected to Wi-Fi and the app.	Full coverage (parts and labor) runs 3 years for residential use or 1 year for commercial use. The stainless tub and frame are covered for 15 years. Exclusions and the claim process weren't reviewed.
Returns	The FAQ says you can return the unit within 30 days for a full refund. A second FAQ answer calls it a hassle-free return policy but says some conditions may apply. It points to the full Return Policy, which wasn't checked for this review.	Standard models have a 30-day money-back policy with a minimum 25% restocking fee. Under the refund policy, you must request a return within 30 days of receipt, and the unit must be unused and in its original packaging. Refunds are paid net of the 25% restocking fee and shipping expenses. Custom builds can't be returned. On a $16,500 tub, the fee alone is at least $4,125.
Unresolved questions	Which chiller (standard or Pro) ships with Cold Only, and so how fast it cools. The store SKU is EVOLVE-AIR-PRO-COLD, but no page text confirms it Chiller wattage and typical daily run time Chiller weight, and whether the 28 lb dry weight covers anything beyond the tub Prices and change interval for replacement filters and water treatment The full return conditions, such as return shipping or restocking fees How long the inflatable tub lasts beyond the 90-day warranty	Exterior and interior dimensions Water capacity, and empty and filled weight Power draw of the chiller, heater and pump Heating rate and typical daily run time Replacement filter price and change interval What's in the included maintenance kit Warranty exclusions and claim process Build and delivery lead time Whether you can order the 54-inch Mini named on the product page Whether the tub or its equipment carries an electrical safety listing such as ETL, UL or CSA Whether the app needs Wi-Fi or carries a fee Whether the C1 gets the UV stage of the brand-wide "ozone + UV" sanitation on BlueCube's performance page (the C1's own listing names only ozone) The price of a Sherwin-Williams custom color Whether a custom color counts as a non-returnable custom build

These comparisons use published specifications, not head-to-head tests. Prices and terms are dated. Unknown costs are not zero. Check the exact variant before you buy.