1. Tub only or tub with a chiller
A tub alone is the cheapest way in: fill it, add ice or let winter do the work, and change the water often. A chiller package holds the water at a set temperature every day, and a combination chiller and heater also lets the same tub run warm.
- Tub only, no chiller$3,986.67SaunaLife Model S1N: Soak Series Home Cold/Hot Immersion Tub, Natural, 1-Person
- Tub with combination chiller and heater$7,120SaunaLife Model S1NC Package: 1-Person Immersion Tub and Combination Water Chiller/Heater, Natural
- Dedicated ice bath$9,995Icetubs IceBarrel: Immersion Tub, Thermowood & Stainless Cold Plunge, 53"L x 31"W x 47"H
- Wood-fired hot tub, for the hot side of contrast$7,586.67SaunaLife Model S4N: Soak Series Home Wood-Burning Hot Tub, Natural, Up to 6 Persons
2. Size the chiller to the tub and the setting
Chiller capacity depends on tub volume, insulation, the air around it, the target temperature and how often it is used. A small tub indoors needs less than a large one outdoors in full sun, and outdoor tubs need more planning for sun, wind, rain and seasons. An underpowered chiller takes too long to cool the water or cannot hold it.
3. Plan water care
Filtration catches particles, and a sanitizer such as ozone, UV or chlorine keeps the water cleaner between changes. Budget for replacement filters and water treatment from day one. An insulated cover keeps debris out and cuts the chiller’s work.
4. Place it next to the sauna
Most people plunge right after the sauna, so put the tub a few steps from the door on a level, stable base with airflow around the chiller and safe access to power. If you are building both, size the sauna heater and the plunge together. How to choose a sauna heater.
5. Go in carefully
Sudden immersion in cold water triggers the cold shock response: a fast heart rate, a reflex gasp and rapid breathing. Ease in, keep your head above water, and talk to your doctor first if you have a heart condition.
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Sources: Icetubs, choosing a cold plunge chiller; Eglin et al. (2015), Rapid habituation of the cold shock response.