Frequently asked questions

The cold plunge. An inflatable tub and a bag of ice costs under $100 and tells you within weeks whether this is a habit or a phase. The cheapest barrel sauna we compare is about $2,700 before an electrician quotes you for a dedicated 240V circuit. Buy the sauna second, when you know you'll use it and you've had someone look at your panel.

It depends on water volume, insulation and ambient temperature, and there is no clean formula because manufacturers don't publish the data one would need. Practically: 1/3 HP holds temperature on a small insulated tub but pulls down slowly; 1/2 HP suits a typical 100-gallon setup; 1 HP and above is for large or uninsulated tubs. Match it to the tub, not to the marketing.

Roughly 1kW per 50 cubic feet of insulated room volume, rounded up. A 6ft x 6ft x 7ft room is 252 cu.ft, which lands on 6kW. Glass and uninsulated surfaces push you up a size. Our calculator does this and shows every step.

Ice works and costs nothing up front. The arithmetic turns against it fast: bagged ice is a recurring cost every session forever, plus the errand. A chiller is one purchase plus modest electricity. If you plunge several times a week the chiller wins on money within months — and it wins on adherence immediately, because the errand is what stops people.

No. They're different appliances sharing a name. Traditional heats the air and stones to 170-195°F and lets you throw water for steam. Infrared heats you directly at much lower air temperature. The practical difference is electrical: an infrared cabin can draw 20A where a 6kW traditional heater needs a bigger dedicated circuit. If your panel is the constraint, that's the trade being offered — but infrared is not a substitute for steam.

6kW at 240V draws 25.0A. The NEC treats a sauna heater as a continuous load, so the circuit is sized at 125% of that — 31.3A — pointing at a 35A dedicated breaker. Caveat that matters: many manufacturers specify 30A, and where equipment is listed its instructions govern under NEC 110.3(B). Your electrician resolves it against the actual nameplate.

Because sustained current heats the breaker, and that heat migrates into the adjacent conductors. The NEC defines a continuous load as one drawing maximum current for three hours or more — a sauna heater qualifies — and requires conductors and overcurrent devices to be sized at 125% of it. Electricians express the same rule from the other end: don't load a circuit past 80% of its rating.

Yes. It draws 25-50 amps continuously for hours; nothing shares that circuit. Confirm specifics with your local authority having jurisdiction — local amendments exist and they govern.

Possibly, and we deliberately won't give you a confident yes or no. NEC 210.8(F) (2023) requires GFCI for outdoor outlets on single-phase circuits rated 150V-or-less to ground and 50A-or-less, which a 240V sauna circuit can fall within. But the exceptions, and whether a hardwired heater is an 'outlet' for this purpose, are actively debated among licensed electricians. This one goes to your AHJ.

We don't publish wire gauge, on purpose. Ampacity depends on conductor material, insulation temperature rating, ambient temperature, bundling and run length. A gauge table we can't verify for your installation is a safety claim we have no business making. We publish the load; your electrician sizes the wire.

Often not. Some chillers — like the 110V EONIX we compare — are designed to plug into an existing outlet. That's a real advantage over a sauna, which essentially always needs new circuit work.

About $8-9 a month for a 6kW heater used three times a week for an hour, at the US average rate of 18.83 cents/kWh, assuming the element is energised around 60% of the session. The big kW number is alarming on paper; the hours are what bill you.

Roughly $16 a month for a half-horsepower-class chiller cycling about six hours a day. Treat that as an illustration of the class, not a product spec — not one of the five chillers we compare publishes a rated wattage, so nobody can compute an exact figure from the listings.

Closer than people expect, and the plunge isn't automatically cheaper. The difference is shape: a sauna costs you when you use it, a chiller costs you continuously — including the weeks you never get in.

Because we have to default to something, and we'd rather it be a sourced number than a made-up one. 18.83 cents is the EIA US residential average for April 2026. The same table has North Dakota at 12.35 and Hawaii at 46.62 — which is exactly why every cost table here shows kWh alongside dollars, so you can multiply by your own rate.

Cleveland Clinic recommends 50-59°F (10-15°C) for beginners and 39-50°F for experienced users, and advises against going below 40°F (4°C) at all.

Cleveland Clinic advises starting at one to two minutes and never exceeding five, at once or twice a week to begin with. Longer isn't better — the risks scale with duration while the demonstrated benefits don't.

For reducing muscle soreness and improving perceived recovery after hard exercise, the evidence is reasonably good. For building muscle, it points the other way — used right after resistance training it may blunt the adaptation. So it depends entirely on what you're asking it to do.

Cleveland Clinic lists heart disease, high blood pressure, diabetes, pregnancy, peripheral neuropathy, poor circulation, venous stasis and cold agglutinin disease as reasons to avoid it. Cold immersion raises blood pressure and stresses the cardiovascular system. If any apply, that's a conversation with your doctor, not with a website.

No. We own none of them and we've tested none of them. It's on every roundup, every product card and the footer. Where a competitor has genuine hands-on data, we'd rather link to them than pretend.

Because you can check them. Every spec links to the manufacturer listing it came from, dated. Every price comes from the Amazon API with the date attached. Every calculation prints step by step. Nothing here asks you to take our word for it — which is the opposite of a testing claim you have no way to verify.

Amazon Associates, tag iceandcedar-20. If you buy through our links we earn a commission at no extra cost to you. We don't sell placement, don't accept free product, and no manufacturer has paid to appear or to rank.

Daily, from the Amazon API, each carrying the date it was checked. If our data goes more than 48 hours stale, the numbers disappear automatically and the buttons fall back to "Check price on Amazon". We'd rather show nothing than a number that was true last week.

Because that's the truth, and it's the most useful finding on the site. Of every listing we surveyed, exactly one published an amperage. None of the five chillers published a rated wattage. We write 'Not published' rather than inferring a number — a blank cell is a fact about the manufacturer, not a gap in our research.

A score implies a measurement, and we haven't measured anything. An '8.4/10' derived from reading spec sheets is testing theater. We rank, we argue the ranking in prose, and we show the specs it rests on.