Cold plunge vs cryotherapy

Volume is the variable nobody thinks about until the first electricity bill or the third bag of ice. Chilling 84 gallons takes roughly a third less energy than chilling 129, and about 60 percent less than 216, for the same temperature drop. If you plunge alone and you are under about six foot two, the extra volume in a bigger tub is water you are paying to keep cold for no benefit.

The side drain with a three-foot hose is the other quiet advantage. Emptying a full tub by tipping it is a two-person job and a wet floor; emptying it through a hose into a drain is not.

The catch is in capitals in the listing itself: chiller compatibility requires a conversion kit sold separately. That is more honest than the listings that imply ports are included, but it is a second purchase, and you should price it before deciding this is the cheap option.

The submersible pump is what makes this the bathtub answer. A chiller normally needs a tub with inlet and outlet ports; a bathtub has neither. Dropping a pump into the water and running two hoses over the rim is inelegant and it works, and it is the cheapest route to a cold plunge for anyone who cannot give up floor space for a tub at all.

Six hundred watts is eleven cents an hour at full draw, comfortably mid-range here. The 79-gallon rating is a good match for a standard bathtub, which holds somewhere between 40 and 80 gallons at plunge depth.

The reusable metal mesh filter rather than disposable cartridges is a genuine running-cost detail that gets ignored because it is not electricity. Cartridge filters are a recurring purchase; a rinsable metal screen is not, and over a year that difference is larger than the difference in power draw between two chillers.

An availability note, because we said we would keep it current: this listing went to "Currently unavailable" on 2026-09-09 and we routed its buy link to a search rather than to a product nobody could add to a cart. Re-checked on 2026-09-12, it is back in stock with a buy-box offer, so the link points at the listing again.

The disclosure that earns this its place is the interior dimension: 51.1 by 26 by 24.4 inches, published alongside the exterior. Almost nothing in this category gives you that, and it is the figure that actually decides whether you fit - the gap between a 59-inch outside and a 51-inch inside is eight inches of wall you cannot sit in. If you are tall, measure your seated length against the inner figure rather than the headline one.

Two more things it publishes that matter more than they look. The port standard is named three ways - 20 mm, G1/2, DN15, half-inch - which is what lets you buy a fitting that seals before the chiller arrives. And the lid is specified as a 3.15 inch clamp-on: both the thickness and the fact that it clamps rather than rests, which is the single cheapest thing that reduces your ice bill, because most heat comes back in through the open water surface.

The gaps are real. The external dimensions appear twice and disagree - 59 by 32.2 by 26.3 inches in the description against 53.15 by 31.5 by 24.02 in the specification table - which is the same pattern we keep finding, and we print both rather than choosing the flattering one. No empty weight, no warranty term and no material temperature tolerance are published; on that last point it is now in company, because no tub on this site publishes a cold rating at all.