What a Cold Plunge Actually Is
A cold plunge is a tub built for short, full-body immersion in water held between 39°F and 55°F. You sit chest-deep for two to five minutes, long enough to feel the shock pass and the focus kick in. Athletes use them after training. Office workers use them before 7am. Everyone uses them differently, and the right tub depends on how cold you want to go, how often you'll plunge, and how much you want the equipment to disappear into the background of your routine.
The water needs to stay cold to be useful. That means either dumping ice into it every session or running a chiller that holds the temperature for you. Most people who plunge more than twice a week end up wanting a chiller. The rest of this page walks through the trade-offs.
Cedar Tubs vs. Stainless Tubs
Cedar tubs are what most people picture when they think of a backyard plunge. Warm grain, a slight cedar scent, and the kind of look that fits a deck or a stone patio. Dundalk's Baltic plunge tub is the entry point: Eastern White Cedar construction, 33 inches across, configurable from a bare tub up to a full chiller-ready setup with insulated cover and entry steps. The Polar cold plunge tub sits one tier up. Same Canadian cedar exterior, but with a choice of white plastic or stainless steel interior liner depending on how clinical or how natural you want the water-facing surface to be.
The Flow cold plunge is Dundalk's most engineered tub. Built-in filtration, integrated chiller plumbing, ergonomic seating, and your choice of knotty or clear cedar exterior. It's the closest thing to a turnkey cold immersion setup we carry. Fill it, plug it in, and you're plunging at 39°F by morning.
Stainless-finished tubs are the other direction. The Kohler x Remedy Place ice bath is built around an 85-gallon stainless interior with a white cedar exterior, modeled on the tubs Remedy Place uses in its New York and LA recovery studios. Stainless is easier to keep clean over years of daily use, more resistant to staining, and pairs well with the chiller-driven workflow most serious cold plungers settle into.
Chiller or Ice Fill — How You'll Actually Use It
If you're plunging once a week, ice works fine. A few bags from the gas station, dumped into a filled tub, will hold you in the 45–55°F range for a single session. It's the cheapest way to start, and it lets you find out whether cold immersion is actually a habit you'll keep before committing to the equipment around it.
Once you're plunging three or more times a week, the math flips. Ice gets expensive, inconvenient, and inconsistent; the temperature drifts every time you open the lid. A water chiller solves all of that. Both the Baltic and the Polar can be ordered with a Coldture Water Chiller Pro or a Penguin Cold Therapy Chiller bundled in. The Coldture pulls water down toward 37°F and holds it there indefinitely with filtration running in the background. The Penguin runs slightly warmer at the bottom of its range but is quieter and cheaper to operate. The Flow integrates its chiller into the tub itself, so there's no exterior unit to position or hide.
One thing worth saying out loud: cold plunge "performance" claims live mostly in personal experience, not in any single study. People tell us they sleep better on plunge nights, that the breath-by-breath focus during a 3-minute session carries into the rest of their morning, and that contrast therapy (alternating a sauna with a cold plunge) feels different than either modality alone. We've found those reports consistent enough to take seriously. We don't promise outcomes.
Sizing, Footprint, and What Your Space Needs
A single-person cold plunge has a smaller footprint than people expect: roughly 3 feet by 6 feet for the tub itself, plus 18–24 inches of clearance around it for entry, exit, and any chiller equipment. The Baltic is the most compact option in our lineup. The Polar is larger and deeper, more suited to taller users or anyone who wants to fully submerge their shoulders without sitting hunched. The Flow and the Kohler ice bath both sit in the larger-footprint category, closer to 7 feet long once you account for the integrated chiller hardware.
Outdoor placement is the most common setup, on a deck, patio, or gravel pad. Indoor placement works for the Polar and Kohler with proper waterproofing and drainage planning, but a basement or garage with a floor drain is far easier than a finished interior space.
Electrical, Water, and Filtration
If you order a chiller-equipped plunge, you'll need a dedicated outlet near the tub. Coldture and Penguin chillers run on standard 120V household current, but they pull enough amperage that we recommend a dedicated 15A or 20A circuit rather than sharing with other outdoor equipment. The Flow's integrated system has the same requirement. For any chiller installation involving a new circuit or outdoor-rated outlet, plan on hiring a licensed electrician. Our guide to dedicated outdoor circuits covers what to ask for.
Water-wise, you fill the tub once and run filtration to keep it clean. Most chillers carried here include either a built-in filter or a fittings kit for an external one. Plan on draining and refilling every 4–8 weeks depending on use, climate, and whether you're using any sanitizer. The Flow's filtration is the most automated; the Baltic and Polar give you more control if you want to run your own filter pump.
Climate Considerations
Cedar plunge tubs handle cold weather well — that's what the wood is built for. In freezing climates, an insulated cover is non-negotiable if you're using a chiller, because the chiller has to work much harder against ambient cold, and uncovered water can freeze at the surface during a hard overnight drop. The optional insulated vinyl cover on the Baltic and Polar is worth ordering at the same time as the tub. In summer, the same insulation works in reverse, keeping chilled water from absorbing heat through the daytime hours.
If you live somewhere with mild winters and warm summers, an ice-fill setup may not be practical year-round — the water warms back up too quickly between sessions. A chiller-equipped tub is the more reliable path in those climates.
Contrast Therapy: Sauna and Cold Plunge Together
Most of the people we talk to who own a cold plunge also own or are planning to add a sauna. The alternation between heat and cold is the oldest version of cold immersion that exists; Finnish, Russian, and Japanese traditions all built around it. Sitting in 180°F dry heat for 15 minutes and then dropping into 45°F water for two does something to your nervous system that neither modality does alone. If you're building toward that, browse outdoor saunas for the heat side of the pairing, or look at the broader home wellness collection for related setups like infrared saunas and red light therapy panels.
If you want the soak experience instead of the cold one, our outdoor hot tubs live in the same category and ship from the same brands.
Brands We Carry
Dundalk Leisurecraft. Canadian-made cedar plunge tubs built specifically for cold-climate use. The Baltic, Polar, and Flow span the range from a simple cedar tub you can ice-fill on weekends up to a fully integrated chiller system. Dundalk's other line of cedar saunas built for the same northern climates is worth a look if you're pairing the plunge with heat. See their sauna heater range for compatible setups.
Kohler. Yes, the bathroom fixture company. The Kohler x Remedy Place ice bath is the result of a partnership with the recovery studio chain, and it brings bathroom-grade engineering and finish to the cold plunge category. Premium pricing, premium build, and the closest thing in the category to a commercial-spec tub for home use.
