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Cold Plunge: Plan, Choose & Build

Everything for a cold plunge, whether you are sizing a chiller, comparing tubs, or building a DIY setup from a tank and a chiller.

Building one? Start with the DIY plan
Tub → chiller → plumbing → power → clean water, with a parts list and running cost.

Choose

Chiller specs (29 chillers)
HP, BTU/hr, ozone and filtration by brand.
Cold plunge tubs (23 tubs)
Volume, material and insulation, every tier.
Which tub?
Size, insulation, material, buy vs build.

Calculate

Chiller size
BTU/hr and HP for your tub, plus running cost.
By tub volume
Straight BTU/HP answers for 50 to 150 gallon tubs.

Learn

Chiller vs ice
The real cost and convenience comparison.
Water care
Ozone, filtration and when to change the water.
How cold, how long
Sensible temperatures and durations.
All guides
Every sauna and cold plunge guide.