Chiller versus ice.
The first decision is whether the tub has a chiller. A chiller is a refrigeration unit that holds the water at a set temperature and circulates and filters it, so the plunge is cold, clean, and ready whenever you want it. The alternative is managing ice by hand, which is cheaper upfront and tedious in practice, especially if you plunge regularly.
For anyone who plans to use a cold plunge as a routine rather than an occasional novelty, a chiller is what makes it sustainable. The water stays at temperature, stays filtered, and does not need refilling and re-icing every session.
What the chiller actually has to do.
A chiller has to pull the water down to the cold you want, usually somewhere around 50°F or below, and hold it there against ambient heat, then keep doing it day after day. That is continuous-duty work, which is why the chiller is the component most worth spending on. An undersized or cheap unit struggles to hold temperature and wears out faster.
Filtration and circulation matter alongside the cooling. Moving, filtered water stays clean far longer than still water, which is the difference between a plunge you can use on impulse and one you have to drain and refill constantly.
The tub itself.
Cedar is the premium choice for a cold plunge tub the same way it is for a sauna: it looks and ages beautifully, suits an outdoor wellness setting, and pairs visually with a cedar sauna. Stainless and composite tubs are durable and lower-maintenance but read more utilitarian.
Size it for a comfortable full immersion up to the shoulders while seated or crouched. Too small and you cannot get under; too large and the chiller works harder than it needs to. Most people want enough to submerge properly without turning it into a pool.
Pairing it with a sauna.
A cold plunge earns its place next to a sauna. The hot-then-cold contrast is the whole appeal of contrast therapy, and designing the two together gets the spacing, the deck levels, and the flow right. Bought separately, they tend to end up awkwardly placed; designed together, they become a proper outdoor wellness space.
Crateworks sources cedar cold plunges with quality chillers as part of an outdoor wellness package, alongside a traditional cedar sauna, decking, shade, and lighting, coordinated as one project rather than assembled piece by piece.
Common questions.
- Do you need a chiller for a cold plunge tub?
- If you want consistent cold and clean water on demand, yes. A chiller holds the tub at a set temperature and circulates and filters the water, so it is ready every day without managing ice. Without one you rely on ice, which is cheaper upfront but tedious for regular use. Because the chiller runs continuously, a quality unit is worth specifying.
- What is the best material for a cold plunge tub?
- Cedar is the premium choice: it looks good, ages well outdoors, and pairs with a cedar sauna. Stainless and composite are durable and lower-maintenance but more utilitarian in look. The material is a style and longevity decision; the chiller is the performance decision.
- How cold should a cold plunge be?
- Many people target around 50°F or below, though tolerance and preference vary. The important thing is that the tub can reach and hold your chosen temperature reliably, which is a question about the chiller more than the tub. Ease into colder temperatures rather than starting at the extreme.
Project in motion
Planning a cold plunge?
We source cedar cold plunges with quality chillers, paired with a traditional sauna for contrast therapy. Send your space to start a design.