Buy from Polar Monkeys: ONE
Polar Monkeys' own page for the ONE. Not a paid link.
ONE vs Cold Stoic 3.0
Polar Monkeys ONE and Renu Therapy Cold Stoic 3.0, compared on the figures their makers publish. Both are cold plunges with a chiller, and the water capacities their makers state are within 30% of each other.
The makers' figures side by side
| Specification | Polar Monkeys ONE | Renu Therapy Cold Stoic 3.0 |
|---|---|---|
| Outside dimensions | Cold plunge dimensions 71”L x 31.5”W x 23.5”H Total footprint 84”L x 31.5”W x 23.5”H | Body: 70” L x 33” W* x 35” H |
| Inside dimensions | — | Tank: 40” L x 25” W x 31” D |
| Electrical supply | 110V (15-Amp dedicated outlet); plug into any 110V outlet | 120V / 15A Dedicated Circuit Recommended; GFCI Power Plug with 12 Foot Power Cord |
| Weight | Weight empty 117 lb / 53 kg; Weight filled 867 lb / 393 kg | Product Weight (Dry): 365 lbs |
| Material | Fully insulated tub | — |
| Water capacity | 90 gal / 341 L | 95 US Gallons |
| Chiller | an all new, 0.8 HP chiller that goes as low as 32°F; an all new, cooling-only chiller | Integrated Wifi-Controlled Chiller & Heater with Advanced Filtration and Ozone Purification System; can cool down to 37°F (2.7 °C) or heat up to 104°F (40 °C) |
| Lowest temperature the maker states | 32°F | 37°F (2.7 °C) |
| Filtration and sanitation | Automatic sanitation and dual-stage filtration; Replace the 20-micron filter every 3 to 4 weeks | Advanced Dual-Stage Filtration System; Advanced Filtration and Ozone Purification System |
| Kit includes | The tub, the chiller, and an insulated cover | Included Basic Tub Lid |
| Warranty | 1-year limited warranty | 5-Year Limited Warranty |
| Price on the maker's site | $6,290 (polarmonkeys.com, 29 Sep 2026) | $11,399 (on Renu Therapy's own site, 29 Sep 2026; the lowest-priced option) |
Each figure is the maker's own, as cited row by row on the ONE and Cold Stoic 3.0 pages and listed in the sources below. A dash means the figure is not on the maker pages we cite. Figures marked "about" are Saunakivi's unit conversions of the maker's figure.
Where to buy
See it at Renu Therapy: Cold Stoic 3.0
Renu Therapy's own page for the Cold Stoic 3.0. Not a paid link.
Where the published figures differ
- Outside dimensions: ONE: Cold plunge dimensions 71”L x 31.5”W x 23.5”H Total footprint 84”L x 31.5”W x 23.5”H. Cold Stoic 3.0: Body: 70” L x 33” W* x 35” H.
- Electrical supply: ONE: 110V (15-Amp dedicated outlet); plug into any 110V outlet. Cold Stoic 3.0: 120V / 15A Dedicated Circuit Recommended; GFCI Power Plug with 12 Foot Power Cord.
- Weight: ONE: Weight empty 117 lb / 53 kg; Weight filled 867 lb / 393 kg. Cold Stoic 3.0: Product Weight (Dry): 365 lbs.
- Water capacity: ONE: 90 gal / 341 L. Cold Stoic 3.0: 95 US Gallons.
- Chiller: ONE: an all new, 0.8 HP chiller that goes as low as 32°F; an all new, cooling-only chiller. Cold Stoic 3.0: Integrated Wifi-Controlled Chiller & Heater with Advanced Filtration and Ozone Purification System; can cool down to 37°F (2.7 °C) or heat up to 104°F (40 °C).
- Lowest temperature the maker states: ONE: 32°F. Cold Stoic 3.0: 37°F (2.7 °C).
- Filtration and sanitation: ONE: Automatic sanitation and dual-stage filtration; Replace the 20-micron filter every 3 to 4 weeks. Cold Stoic 3.0: Advanced Dual-Stage Filtration System; Advanced Filtration and Ozone Purification System.
- Kit includes: ONE: The tub, the chiller, and an insulated cover. Cold Stoic 3.0: Included Basic Tub Lid.
- Warranty: ONE: 1-year limited warranty. Cold Stoic 3.0: 5-Year Limited Warranty.
- Price on the maker's site: ONE: $6,290 (polarmonkeys.com, 29 Sep 2026). Cold Stoic 3.0: $11,399 (on Renu Therapy's own site, 29 Sep 2026; the lowest-priced option).
Figures we cite for only one of the two: inside dimensions (only Renu Therapy's cited pages give it); material (only Polar Monkeys's cited pages give it). Ask the other maker before treating the two as equal on those points.
Read each one in full
Polar Monkeys ONE
Polar Monkeys · cold plunge with a chiller · 90 gallons · 120 V supply
Renu Therapy Cold Stoic 3.0
Renu Therapy · cold plunge with a chiller · 95 gallons · 120 V supply
Sources
- ONE - Polar Monkeys — Polar Monkeys
- Cold Stoic 3.0 - Renu Therapy — Renu Therapy