How cold do these go?

Each unit here reaches about 34 F or below on its built-in chiller; a few state 32 F. That is colder than most people use a plunge, so treat the lowest numbers as headroom. Our recovery disclaimer applies: consult a clinician before starting cold-water practices, especially if you are managing a condition.

Cold plunge · Best-of

Best Cold Plunge for the Coldest Water

The best pick for the coldest water is a unit that reaches the low 30s F on a real chiller and still holds up on water care and value, not the one with the most aggressive number and nothing behind it.

Some buyers want the lowest possible set temperature. This list keeps only self-chilling plunges that reach about 34 F or colder on their built-in chiller, then ranks them by composite, so you can see which units hit the bottom of the range and still score well on water care, build, and value.

How we score: We keep self-chilling units that reach about 34 F or below, then rank by composite score.

18.1
Polar Monkeys Cyber Plunge
A marine-grade stainless plunge with a built-in heating and cooling chiller holding water as low as 32 F, with ozone and filtration.
- Chiller: yes
- Min temp: 32 F
- Running cost/yr: ~$300
- Price: $15,690
27.9
Sun Home Cold Plunge Pro
Encased stainless plunge with a 1 HP built-in chiller that drives water to 32 F, plus ozone, UV, and filtration.
- Chiller: yes
- Min temp: 32 F
- Running cost/yr: ~$360
- Price: $13,799
37.8
Hydragun Supertub Cold Plunge
An inflatable all-in-one plunge with a built-in chiller, filtration, and ozone - one of the cheapest self-chilling options.
- Chiller: yes
- Min temp: 34 F
- Running cost/yr: ~$200
- Price: $2,999

FAQ

How cold do these go?: Each unit here reaches about 34 F or below on its built-in chiller; a few state 32 F. That is colder than most people use a plunge, so treat the lowest numbers as headroom. Our recovery disclaimer applies: consult a clinician before starting cold-water practices, especially if you are managing a condition.