Buying
Cold plunge tubs at home: what to know before you buy
The types of cold plunge tub, what a chiller does, what power you need and how to keep the water clean, plus the safety basics before your first plunge.
A home cold plunge is a small tub of cold water you sit in for a short time, usually after exercise, a sauna or a hot tub. The big decision is how you keep it cold and clean: ice in a simple tub, or a tub with a built-in chiller and filtration that holds the temperature you set all year.
Why people plunge, and the safety basics
People who plunge regularly often say it leaves them feeling alert and refreshed, and many like it as a contrast to the hot tub or sauna. Research into the health effects is still developing and the results are mixed, so it's best not to buy one expecting a treatment for anything.
Cold water also has real risks. Getting into very cold water triggers a gasp and fast breathing, and a jump in heart rate and blood pressure, known as cold-water shock. Before you start:
- Talk to your doctor first, especially if you have a heart condition, high blood pressure or circulation problems, or you're pregnant.
- Never plunge alone or after drinking alcohol.
- Keep your head above water and get in slowly.
- Start with short sessions in water that isn't too cold, and get out if you're shivering hard or going numb.
- Warm up gradually afterwards with dry clothes and movement.
- Keep the lid locked so children and pets can't get in.
Types of cold plunge tub
Chest freezer conversions
You'll see videos of chest freezers filled with water. We don't recommend them. A freezer isn't built to have people sitting in water inside it while it's plugged in, its electrical parts aren't designed for that use, and the result is a real shock risk. A purpose-built tub with proper electrical protection is a much safer choice.
Inflatable and barrel tubs with ice
The simplest option: a portable tub filled from the hose, chilled with bags of ice. It's an inexpensive way to find out whether you'll keep plunging. The downsides are hauling ice, water that warms up within hours, and water that needs changing often because there's usually no filtration.
Hard-sided tubs with a chiller
This is what most people mean by a cold plunge tub: an insulated tub with a built-in chiller (a small refrigeration unit), a pump, a filter and usually ozone or UV to help keep the water clean. You set the temperature and it holds it, so the tub is ready whenever you are. See the cold plunge tubs we can show you in Langley.
Hot and cold setups
Some people pair a cold plunge with a hot tub or sauna and go back and forth. Some chiller units can also heat, which lets one tub do both. If you're planning both, it's worth thinking about the layout and the power for the two together. Our hot tubs page is a good place to start.
Chillers and power
Chillers are usually sized in horsepower. A bigger chiller cools the water faster after you fill it and copes better with warm summer days; a smaller one is quieter and uses less power but takes longer to recover.
A few practical points:
- Power. Many plunge tubs plug into a standard 120-volt outlet, and some larger units need a dedicated circuit or 240 volts. Check the model's specifications before you buy. Whatever it needs, use a dedicated GFCI-protected outlet and never an extension cord.
- New circuits need a permit. An outdoor outlet or a new circuit is electrical work that needs a permit in BC. Our hot tub electrical page and permit guide explain how that works.
- Airflow. A chiller pushes out heat, so it needs space around it to breathe. Shade helps outdoors; indoors, that heat goes into the room.
- Running cost. It depends on the chiller, the insulation, the lid and how warm it is around the tub. Our running costs guide shows how to work out the electricity from a unit's power rating.
Indoors or outdoors
Indoors (garage, basement or home gym), check that the floor can carry the weight: water weighs about 1 kg per litre, so a tub with a few hundred litres plus a person adds up quickly. Have a floor drain or a plan for emptying it, protect the floor from splashes, and allow for the chiller's warm exhaust air. Cold water doesn't steam the way a hot tub does, so humidity is less of a problem.
Outdoors, choose a model rated for outdoor use, put it on a firm level base, and keep the lid on. In a hard frost, keep the pump running and check what the manufacturer says about freeze protection, since water held just above freezing has little margin.
Keeping the water clean
Cold water slows bacteria down, but it doesn't stop them. To keep a plunge fresh:
- Shower before you get in; sweat, lotion and sunscreen cloud the water fast.
- Keep the lid on between sessions to keep out leaves, dust and bugs.
- Run the filter and clean or replace the cartridge as the manufacturer recommends.
- Use the sanitizing method the manufacturer specifies (often ozone or UV plus a small amount of sanitizer) and test the water regularly.
- Change the water on schedule. Ice tubs without filtration need fresh water far more often than a filtered chiller tub.
Our chemicals and supplies page covers test strips and water care.
How our seasons change things
In summer, Fraser Valley tap water and air are far too warm for a cold plunge without a chiller. Through the colder months an outdoor tub can get cold on its own, but our winters swing between mild rain and freezing outflow winds, especially around Abbotsford and Chilliwack, so the temperature won't be steady. A chiller gives you the same water every day, and in a deep cold snap the job becomes keeping it from freezing.
Choosing a cold plunge: a checklist
- Size: can you sit with your shoulders under, and is it long enough for your legs?
- How cold the chiller goes, and how fast it recovers after use.
- Filtration and sanitizing: filter type, ozone or UV, and how often the water needs changing.
- Insulation and a lockable lid.
- Power: a standard outlet, a dedicated circuit or 240 volts.
- Indoor or outdoor rating, and the noise level of the chiller.
- How it drains.
- Warranty, and who services the chiller locally.
Searching for a cold plunge near you in Langley or elsewhere in the Fraser Valley? Come and see them at our showroom, or request a quote and tell us where it will go.