Cooling Tub

A cooling tub is a wellness device designed for brief immersion of the body in cold water, typically in the range of 3 to 15 °C. It is used mainly after a sauna session or physical exertion to cool the body rapidly and stimulate physiological responses. The principle relies on sudden cooling of the skin, which causes constriction of the blood vessels (vasoconstriction) and subsequently improved blood circulation once the body warms again. Modern cooling tubs may be passive (without active cooling) or fitted with a chiller, filtration, and a disinfection system for stable temperature and hygiene. Construction is typically wood, acrylic, stainless steel, or composite materials. It is a functional complement to the sauna that completes the full thermal cycle of the wellness procedure.

Advantages of the cooling tub

• Rapid recovery after a sauna session or physical exertion: Cold water supports muscle recovery and reduces the feeling of fatigue.
• Stimulation of blood circulation and the vascular system: Alternating heat and cold improves vascular flexibility and blood circulation.
• Higher overall effectiveness of the sauna session: Cooling is a key phase of the sauna cycle that maximises its physiological effect.
• Psychological resilience and mental adaptation to stress: Brief exposure to cold activates the body’s adaptive mechanisms.

Cold-water conditioning at home: a passive tub or a tub with a chiller

With cold-water conditioning and cold bathing at home, one thing decides the matter – whether you can hold the water at a stable temperature even when it is warm outside. Cooling tubs fall into two types on that basis.

How to start with cold bathing

Practical recommendations drawn from ordinary practice with garden setups. These are organisational tips, not a health recommendation – if you have a health limitation, discuss cold bathing with your doctor.

• Start at a higher temperature. Water at around 12 to 15 °C is easier to manage for the first sessions than 3 to 5 °C.
• Short and regular. In practice, a shorter stay repeated more often proves more workable than a single long one.
• Never on your own for the first attempts. The response to cold is individual, and it is better to take the first entries with another person present.
• Keep water hygiene in mind. Cold water slows the multiplication of micro-organisms but does not stop it – filtration or disinfection is needed just as it is with warm water.

Related terms: Chiller, UV-C sterilisation, Ozone generator, 2-in-1 Sauna + Hot Tub.