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Chilled plunge tub

Plunge All-In

Gen 2, Cold Only (no heater add-on)

$7,990US price, checked Oct 13, 2026

Plug-in 105-gallon chilled tub that Plunge says reaches 37°F

Check price at Plunge Full review →

Our hot-and-cold pick

Renu Therapy Cold Stoic 3.0

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

$11,399US price, checked Oct 13, 2026

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

Check price at Renu Therapy Full review →

Criterion	Plunge All-In	Renu Therapy Cold Stoic 3.0
US price	$7,990Checked Oct 13, 2026 · Price details in the review	$11,399Checked Oct 13, 2026 · Price details in the review
Three-year ownership estimate	$7,990 Incomplete known subtotal. Not included: installation, annual consumables, energy use.	$12,013.95 Incomplete known subtotal. Electricity assumption: $0.18/kWh. Not included: installation, annual consumables, other annual costs.
Choose if	You want an all-in-one chilled tub for home use, indoors or out, and you have a dedicated 120 V, 15 A circuit and a floor that can take 1,150 lb.	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	The price depends on a time-limited sale, the base warranty is one year, and running costs are unknown because the product page gives no power draw.	The chiller gets only 1 year of coverage (other covered components get 5 years), returns cost 5% plus shipping, and a fresh fill cools slowly at the manual's rate.
Key specifications	Chiller temperature: Down to 37°F. Plunge gives a cooling rate of 10–12 degrees per hour Chiller: 0.75 HP. Plunge says it holds 37°F in 120°F ambient air Water capacity: 105 gallons Electrical: Dedicated 120 V, 15 A circuit and a 7 ft cord with GFCI. Power draw not stated Sanitation: Onboard ozone. Plunge says the full volume is filtered about every 15 minutes Weight: 238 lb empty, 1,150 lb full Heating: None on Cold Only. The Add Heater version ($8,490 in the sale, $10,490 Comp. Value) goes up to 104°F, and Plunge gives a heating rate of 4–5 degrees per hour Controls: The free Plunge app works over Wi-Fi to set the temperature, track sessions and send filter and water-treatment reminders Use: Residential use only, indoors or outdoors. Plunge sells a separate commercial model	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. 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. Test conditions aren't stated 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: Wi-Fi app (ControlMySpa, per the user manual), touchscreen and programmable lighting. Renu gives 58 dB at about 3 ft from the large grill
Exact variant	Gen 2, Cold Only (no heater add-on)	Meterous Black finish, California Redwood deck, included basic tub lid (SKU AS-CS30-BK-RD)
Dimensions	Plunge lists the tub at 76.75 L × 31.5 W × 28.75 H in. It weighs 238 lb empty and 1,150 lb filled. Plunge asks for at least 16 in of clearance on the fan side for ventilation. It also wants 12 in at the front for drain access and ventilation, and 4 in on the left side as you face the LED display. Plunge doesn't state interior dimensions.	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	It needs a dedicated 120 V, 15 A circuit. A 7 ft power cord with a GFCI on the end is built in. There's no plumbing: Plunge says all you need to do is fill it with water and plug it in. Standard delivery is curbside, to the driveway or curb. Most customers qualify for free in-home delivery in Plunge's core "In Area" zones. It puts the tub on the first level, unpacks it and removes the packaging. Setup and connection to power aren't included. In-stock units ship within 8 business days in the lower 48 states. Hawaii, Alaska and US territories take an additional 2 to 3 weeks.	Renu recommends a dedicated 120 V, 15 A circuit. The user manual adds that the circuit shouldn't be shared with other devices and calls for grounded 110 V/120 V power. The unit has a GFCI plug. The product page lists a 12 ft cord, but the cut sheet shows both a 12 ft GFCI cord and a 9 ft standard 3-prong cord. No plumbing connection is described. The manual says to fill the tub with a hose to 6 to 8 in below the top and to place it on a level surface in a water-resistant area. It doesn't give a floor-load rating, and the filled tub weighs about 1,155 lb. Delivery is free curbside within the contiguous US, and you have to move the tub off the pallet yourself. It ships in 3 to 5 weeks.
Materials	Plunge says it's built for indoor and outdoor use, and an insulated cover is included. Plunge doesn't say what the tub or shell is made of.	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 HD foam 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	The standard warranty is 1 year. During the Fall Plunge Sale, Plunge adds a complimentary 2-year extended warranty, which it values at $299. The product page doesn't give coverage details or exclusions.	Covered components get a 5-year limited warranty from the delivery date. The water chiller is the exception, at 1 year. The user manual dates coverage from shipment instead. You can add a 4-year extended chiller warranty, for 5 years in total, if you buy it within 364 days of shipment. Its price isn't stated. Coverage is for non-commercial home use in the contiguous US by the original purchaser. Exclusions include water leaks, poor water chemistry, neglected filter care, freezing conditions, power outages, low water flow and misuse. Renu also takes no responsibility for the natural wood of Redwood and Cedar decks. The user manual says the warranty doesn't cover the water filter or the filter housing O-ring. You do most repairs or part replacements yourself. Renu covers parts for covered repairs, and you pay shipping and removal costs. Renu pays approved-provider labor at up to $50 per hour, for a maximum of 2 hours. Rural travel fees aren't covered.
Returns	Plunge offers a 30-day guarantee. It says that if you're not 100% satisfied within the first 30 days, you get a hassle-free return policy, though "some conditions may apply". The product page doesn't state return fees or pickup costs.	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	Average power draw and annual electricity use Noise level (Plunge calls it ultra-quiet but gives no figure) Tub, shell and insulation materials Interior dimensions Return fees and pickup costs Which conditions sit behind "some conditions may apply" on returns Warranty coverage details and exclusions What the extended warranty adds Standalone price and replacement interval for filters and water-care chemicals Whether it carries an electrical safety listing such as ETL or UL When the Fall Plunge Sale ends	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 it's actually in stock: the page showed a "Sold Out" label, but Renu's online store marked this version available An indoor or outdoor rating: the page says the tub is designed to withstand harsh weather, and the warranty page mentions weathering of the natural wood decks on outdoor units, but neither gives one Whether the app carries any fee

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.