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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 →

Our cheapest chilled pick

Sun Home Cold Plunge Horizontal

Horizontal (2-Person), SKU POLAR623: inflatable lie-down tub with a 1 HP chiller that cools and heats

$4,099US price, checked Oct 13, 2026

Inflatable lie-down tub with a 1 HP chiller that cools and heats, 32 to 104°F

Check price at Sun Home Full review →

Criterion	BlueCube C1 Cold Plunge Tub	Sun Home Cold Plunge Horizontal
US price	$16,500Checked Oct 13, 2026 · Price details in the review	$4,099Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$16,500 Incomplete known subtotal. Not included: installation, annual consumables, other annual costs, energy use.	$5,373.01 Incomplete known subtotal. Not included: installation, other annual costs, energy use.
Choose if	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.	You want cold plunges and warm soaks from one portable tub at $4,099, and you can give it a dedicated 15 A GFCI circuit.
Main trade-off	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.	The warranty lasts only one year, and the manual asks you to drain and refill the tub every 2 to 3 weeks.
Key specifications	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	Temperature range: 32–104°F, cooling and heating. The chiller needs ambient air above 40°F to run Chiller: 1 HP, 21.2 × 15.7 × 21.7 in, 88 lb, 55–60 dB. Cooling rate not stated Electrical: Rated 120 V, 11 A with a NEMA 5-15P plug, on a dedicated 15 A GFCI circuit. Wattage not stated Water capacity: 128 gallons on the spec card, spec sheet and manual. The store description says 80–90 gallons Tub size and weight: 77.2 × 27.6 × 24.4 in outside, 15.5 lb empty. Filled weight not stated Water care: 20-micron paper filter, metal inlet screen and ozone injection. Full water change every 2–3 weeks Controls: Sun Home or Tuya app over 2.4 GHz Wi-Fi for temperature and scheduling, with a child lock
Exact variant	60-inch Standard, Black cladding	Horizontal (2-Person), SKU POLAR623: inflatable lie-down tub with a 1 HP chiller that cools and heats
Dimensions	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.	The assembled tub measures 77.2 in long, 27.6 in wide and 24.4 in high. The manual and store description give the outer size as 6.4 × 2.3 × 2.1 ft. The store description puts the inside at 69 × 19.5 in, and the spec sheet at 69.3 × 19.7 in. The chiller is a separate box, 21.2 × 15.7 × 21.7 in. Empty, the tub weighs 15.5 lb and the chiller 88 lb. The spec card, spec sheet and manual list 128 gallons (485 L in the manual). The store description says 80 to 90 gallons instead. Sun Home doesn't explain the gap. The manual's fill line is 8 in below the top. Sun Home doesn't give a filled weight.
Installation	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.	No plumbing is needed, Sun Home says. The tub inflates to 10 to 12 PSI with the included air pump, and the chiller connects with the included inlet and outlet hoses. The chiller plugs into a standard NEMA 5-15 outlet. That outlet must sit on a dedicated 15 A GFCI circuit. The manual says a licensed electrician should do all electrical work, and the wiring must follow local code. It also asks for a flat surface that can support 3,000 lb. Keep the chiller fan 3 ft from the tub and from walls. Keep the plunge at least 5 ft from other appliances. Leave 36 in clear in front of and behind the tub. Let the chiller stand upright and unplugged for 4 hours before first use. Sun Home rates the tub for indoor and outdoor use, but the chiller needs ambient air above 40°F to run.
Materials	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.	Sun Home describes a puncture-resistant inflatable tub with an insulated cover and lid. It doesn't name the tub's fabric or construction, or the cover's material. The box also includes an air pump, inlet and outlet hoses with gaskets, a metal inlet screen, a spare 20-micron paper filter, a filter wrench, a repair kit and a carrying case.
Warranty	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.	Sun Home gives the Cold Plunge a 1-year residential limited warranty against manufacturing defects. It starts at purchase or delivery, whichever is later, and covers the original buyer only. The warranty page and help-center FAQ cover labor and shipping for the first 90 days from delivery. After that, you pay both. The owner's manual reads differently: it says parts only, no labor, with freight at your cost. The manual also says commercial use voids the warranty, and it excludes freezing and improper water chemistry. Sun Home replaces defective parts at its discretion, and wear and tear and abuse aren't covered. The product page shows a "1+ Year Warranty" badge and a site-wide "Limited Lifetime Warranty" banner for most models. The warranty page lists one year for the Sun Home Cold Plunge and the Cold Plunge Pro and doesn't name the Horizontal separately. Extended warranties are sold separately, and the warranty page gives no price.
Returns	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.	You can return it within 30 days of delivery only if it's unused and still in its original, unopened packaging. Sun Home won't take back an uncrated, assembled or used cold plunge. The refund loses a 25% restocking fee plus shipping both ways, even on a free-shipping order. Returns need approval through Sun Home's returns portal first. Refunds are issued within 21 days of receiving the return, after inspection. Every cancellation costs 3% per product. You can cancel an in-stock order within 24 hours. After that, a 25% restocking fee applies, and you may also pay roundtrip shipping. On a $4,099 tub, the restocking fee alone is $1,024.75.
Unresolved questions	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	Chiller wattage, average power draw and daily run time Cooling and heating rate Filled weight Whether the real water volume is 128 gallons or 80–90 gallons Whether the tub is meant for one person or two The tub's fabric and construction Whether the tub or chiller carries an electrical safety listing such as ETL, UL or CSA Refrigerant type Whether the app carries a fee Price of the extended warranty

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.