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Chilled plunge tub

Coldture Classic

Classic tub with Chiller Pro bundle (400 liters)

$3,499US price, checked Oct 24, 2026

Inflatable 400-liter tub bundled with Coldture's plug-in Chiller Pro

Check price at Coldture Full review →

Chilled plunge tub

Renu Therapy Cold Stoic 3.0

Meterous Black finish, California Redwood deck, included basic tub lid (SKU AS-CS30-BK-RD)

$12,799US price, checked Oct 23, 2026

Hot-and-cold plunge tub, 37 to 104°F, with published power use

Check price at Renu Therapy Full review →

Criterion	Coldture Classic	Renu Therapy Cold Stoic 3.0
US price	$3,499Checked Oct 24, 2026 · Price details in the review	$12,799Checked Oct 23, 2026 · Price details in the review
Three-year ownership estimate	$3,979 Incomplete known subtotal. Not included: installation, other annual costs, energy use.	$13,413.95 Incomplete known subtotal. Electricity assumption: $0.18/kWh. Not included: installation, annual consumables, other annual costs.
Choose if	You want a portable chilled tub that runs from a standard outlet and you'll keep up the 30-day filter changes.	You want cold plunges and warm soaks at home from one tub, you can give it a dedicated 120 V circuit, and you can handle curbside delivery of a 365 lb tub.
Main trade-off	A return costs a 15% restocking fee, and the 1-year warranty is void if you miss a filter change or lose the app connection.	The chiller gets 1 year of coverage while the rest gets 5. Returns cost 5% plus shipping, and the manual puts cooling at 1.5 to 3°F per hour.
Key specifications	Lowest stated temperature: 37°F (3°C) with the Chiller Pro. Coldture's spec table gives a 37–104°F range because the chiller also heats Water capacity: 400 liters (about 106 US gallons), for one or two people Tub size and weight: 160 by 75 by 67 cm (63 by 29.5 by 26.3 in). Empty and filled weight not stated by the manufacturer Chiller Pro: 61.5 by 33.4 by 48.2 cm (24.2 by 13.1 by 18.9 in), 30 kg (66.1 lb) dry. Cooling capacity 2,490 W, heating capacity 3,300 W Electrical: 120 V (rated 110–120 V), 8 A, standard 15 A outlet. Average power draw 850 W. The FAQ recommends a dedicated circuit Filtration and sanitation: Continuous circulation through a 20-micron filter changed every 30 days. Coldture's bundle and Chiller Pro pages say filtration and ozone cycle the water every 15 minutes, while the Chiller Pro spec table lists only filtration. Chemicals are sold separately Insulation and cover: Insulated walls and an insulated cover are included. No insulation rating or temperature-hold time is given Indoor or outdoor: Indoors or outdoors down to 14°F (-10°C). The warranty is void if the chiller is left off below freezing Controls: Coldture app to set temperature and schedule cycles. The warranty requires the unit to stay connected to the app with current firmware In the sale bundle: Tub, Chiller Pro, insulated cover and hand pump, plus a free maintenance kit, 3-pack of 20-micron filters, dry mat and hose sleeves	Temperature range: 37°F to 104°F from the integrated chiller and heater Chiller and heater: 0.5 HP chiller and 1 kW heater. The user manual gives cooling at 1.5–3°F per hour and heating at 4–6°F per hour Water capacity: 95 gallons at normal fill, 134 gallons maximum Weight: 365 lb dry, about 1,155 lb filled Electrical: 120 V, with a dedicated 15 A circuit recommended Power draw: Peak draw is 518 W (6.1 A) cooling and 1,013 W (8.6 A) heating. The user manual gives a typical 350–500 W at 3–5 A while the chiller runs Average power: 130 W over 24 hours holding 40°F, and 260 W holding 100°F. Renu doesn't give the test conditions Sanitation: Ozone generator plus two-stage filtration. The user manual places a quick-swap primary filter in the tank, and a larger XL secondary filter sits in a housing reached through a vent panel Controls and noise: App control through ControlMySpa, with a supplied gateway that plugs into your router by Ethernet. Touchscreen and programmable lighting. Renu gives 58 dB at about 3 ft from the large grill
Exact variant	Classic tub with Chiller Pro bundle (400 liters)	Meterous Black finish, California Redwood deck, included basic tub lid (SKU AS-CS30-BK-RD)
Dimensions	Coldture lists the Classic tub at 160 cm long, 75 cm wide and 67 cm high (63 by 29.5 by 26.3 in). That's about the size of a bathtub. It holds 400 liters (about 106 US gallons) and fits one or two people. The Chiller Pro is a separate box, 61.5 by 33.4 by 48.2 cm (24.2 by 13.1 by 18.9 in). It weighs 30 kg (66.1 lb) dry and 35 kg (77.1 lb) packaged. Coldture doesn't give the tub's empty weight or its filled weight. The water alone is 400 kg, or about 880 lb, at 1 kg a liter.	The body measures 70 L × 33 W × 35 H in. It's 33 in wide at the base and top and about 35.5 in at the widest point of the contoured sides. The tub interior is 40 L × 25 W × 31 D in. The tub weighs 365 lb dry and about 1,155 lb filled with 95 gallons. The user manual gives about 1,165 lb filled. The cut sheet asks for 15 in of clearance at the small vent and 27 in at the large vent. It also asks for 1 to 2 in on the long side for the cord.
Installation	The Chiller Pro plugs into a standard household outlet, and Coldture says no special electrical work is needed. The features list says 110–120 V at 13 A. The spec table says 120 V at 8 A on a standard 15 A outlet. Coldture's FAQ recommends a dedicated circuit and GFCI protection for outdoor outlets. Electrical installation is never included in its prices. Coldture says the included hand pump inflates the tub in minutes, and the tub has a hose connection for draining. It's designed for indoor or outdoor use down to 14°F (-10°C). Coldture's policy says curbside delivery is available only in Canada, while white glove delivery covers both countries. White glove places the box on the ground floor and removes the packing, but it doesn't include assembly. The policy doesn't say which method applies to this bundle or what it costs in the US. Shipping is calculated at checkout, and the bundle page says it ships Nov 10.	Renu recommends a dedicated 120 V, 15 A circuit that isn't shared with other devices. The unit has a GFCI plug, and the product page lists a 12 ft cord while the cut sheet shows both a 12 ft GFCI cord and a 9 ft standard cord. No plumbing is needed. Fill the tub with a hose to 6 to 8 in below the top and set it on a level surface in a water-resistant area. Renu gives no floor-load rating, and the filled tub weighs about 1,155 lb. Delivery is free curbside within the contiguous US, you move the tub off the pallet yourself, and it ships in 3 to 5 weeks.
Materials	Coldture describes the tub as an inflatable made of reinforced 4-inch PVC drop-stitch material, with insulated walls and an insulated cover included. The page gives no insulation rating or hold time. The Chiller Pro is built by Coldture and has continuous internal filtration. Coldture's VIP Classic + Chiller Pro page calls the same Classic tub rotomolded, which conflicts with the inflatable description on the bundle page.	Renu doesn't state the shell material, though its warranty page groups the Cold Stoic 3.0 with its plastic tubs. The perimeter has 4 in of insulation. The version priced here has a California Redwood breath deck, and Pacific Cedar and four composite decks are options. Renu also lists a basic tub lid and a matching step stool, and says the tub is handcrafted in Southern California.
Warranty	One year on the tub and one year on the Chiller Pro, per Coldture's portable units warranty. Coverage starts at delivery for the original residential buyer. It covers the housing, pumps, chiller parts, heaters, sensors, controls, plumbing leaks and the filtration system against defects. Coldture pays standard ground shipping on approved replacement parts but not labor. The warranty is void if the unit isn't connected to the Coldture app or its firmware isn't kept current. It's also void if filters aren't Coldture's or aren't changed at least every 30 days. Water chemistry has to stay within Coldture's protocols. Leaving the chiller off below freezing, or pairing it with a tub Coldture didn't make without approval, also voids it. A chiller claim has to ship in the original box. Coldture's VIP page says 3 years on the tub, which conflicts with the 1 year on the bundle page. The Chiller Pro page says the warranty can be extended.	Covered components get a 5-year limited warranty from delivery, except the water chiller at 1 year. The user manual says shipment instead. You can add 4 more chiller years if you buy the extension within 364 days of shipment, and Renu doesn't give its price. Coverage is for the original purchaser's non-commercial home use in the contiguous US. Water leaks, poor water chemistry, neglected filter care, freezing, power outages, low water flow and misuse are excluded. You do most repairs yourself, Renu covers parts, and you pay shipping and removal. Renu pays an approved provider's labor at up to $50 per hour, for a maximum of 2 hours.
Returns	30 days from delivery, with a 15% restocking fee, per Coldture's shipping and return policy. That's about $525 at the $3,499 sale price. The policy says Coldture covers return shipping when the product is unused, unopened and in original condition, and it may send a prepaid label. The refund policy page leaves that out and says administrative fees can also come off the refund. It doesn't state the fee amount. The chiller has to go back in its original box, and a replacement box costs extra. Refunds arrive within 30 business days after Coldture inspects the return. Cancellation is free until the earlier of 24 hours after you order or shipment. Damage must be reported within 24 hours with photos. A defect or wrong item must be reported within 15 days. The restocking fee doesn't apply to verified defects.	You can return a new cold plunge from a domestic order for any reason within 45 days of delivery. It has to arrive back in good condition, and you pay a 5% restocking fee and shipping costs. Refunds process 3 to 10 business days after receipt. Canceling before shipment costs 5%, and shipped orders can't be canceled. Refurbished, international and bulk (3 or more units) sales are final.
Unresolved questions	The tub's empty weight and filled weight How long the insulated tub and cover hold the cold How fast the Chiller Pro cools 400 liters, since the FAQ gives a rate only for the PRO Plunge all-in-one How many hours a day the chiller runs, since 850 W is an average The US delivery method and cost for this bundle The amount of Coldture's administrative fees on a return or late cancellation Whether the app is free and what Wi-Fi it needs Whether the tub is inflatable drop-stitch or rotomolded, and whether it carries a 1-year or 3-year warranty Why the Chiller Pro spec table lists only filtration when its page text describes ozone What the maintenance kit contains and how often to change the water Whether the tub or chiller carries an electrical safety listing such as ETL, UL or CSA	Shell material (the warranty page groups the tub with Renu's plastic tubs but names no material) Whether the unit carries an electrical safety listing such as ETL, UL or CSA Price of the extended chiller warranty Price of a replacement primary filter How often the XL filter actually needs replacing rather than cleaning Ambient temperature, cover use and test method behind the 130 W and 260 W average power figures Whether the primary filter is reusable (product page) or replaced every 2 to 4 weeks (user manual) Cord length (12 ft GFCI or 9 ft standard) Filled weight (1,155 lb on the page, about 1,165 lb in the manual) Whether the warranty covers the water filter or its housing O-ring, which the manual excludes Whether the warranty covers natural-wood Redwood and Cedar decks, since Renu takes no responsibility for the wood An indoor or outdoor rating. Renu doesn't give one. The product page says the tub withstands harsh weather, and the warranty page mentions weathering of the wood decks on outdoor units Whether the app carries any fee Whether the manual's start date (shipment) or the warranty page's start date (delivery) applies

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.