In-depth review
Frozin 400 Cold Plunge Tub with Chiller Review (2026)
In-depth review of the Frozin 400: the 0.8 HP chiller, foam-insulated roto-molded tub, filtration, and who should buy the bundle.
REZVANI Frozin 400 Cold Plunge Tub with Water Chiller, 100 Gallon
The set-and-forget bundle: a foam-insulated roto-molded tub with a 0.8 HP chiller that holds water near 37F without ice runs.
Our verdict
The Frozin 400 is the best tub-plus-chiller bundle here, because it removes the two chores that stop people plunging: buying ice and waiting for water to cool. The 0.8 HP chiller holds water near 37F on the maker claim, the foam-insulated roto-molded tub keeps it there, and the filtration and pump keep the water cleaner for longer. It is heavy, fixed in place, and costs more to run than any ice tub, but for daily plungers it is the bundle that actually gets used every day.
What we like
- The included 0.8 HP chiller cools water down to 37F on the maker claim, so the tub stays cold between sessions with no ice.
- Foam-insulated roto-molded construction keeps cold in and gives the tub a rigid, permanent feel that inflatables cannot match.
- A 20-micron filtration system and a 650 gallon per hour pump keep the water cleaner for longer between changes.
What to watch out for
- The bundle is heavy at 90 pounds and 48 inches long, so it needs a planned, level spot and is not portable in any real sense.
- A chiller adds running costs, noise, and maintenance that a simple ice tub never has.
- The rectangular shape and 28 inch height need a step or a careful climb for shorter users getting in and out.
Who it is for
Daily plungers and athletes who want a fixed temperature on tap and a permanent setup, and who have power near the tub location.
The chiller is the product
The 0.8 HP chiller cooling to 37F is what you are really buying: it turns cold plunging from a planned event into a habit, since the water is ready whenever you are. The 20-micron filtration and the 650 gallon per hour pump matter too, because circulated, filtered water stays usable far longer than still water, which cuts down on water changes. The trade is running cost and noise: a chiller draws power continuously while holding temperature, and it hums while it works.
The tub itself
The tub is a foam-insulated roto-molded 100 gallon rectangle, 48 inches long and 28 inches high, made in the USA. The rectangular shape is a real advantage over a barrel: you lie back rather than sitting upright, which suits longer sessions and taller users up to 6 ft 3 in. The 90 pound weight and the fixed shape mean it needs a planned, level spot, and shorter users will want a step for getting in and out safely.
Running costs and maintenance
Budget for electricity, filter changes, and sanitiser on top of the purchase price, and expect the chiller to work hardest in summer. Keep the filter clean and the water changed on the maker schedule, since a chiller running on dirty water cools poorly and wears faster. The bundle makes sense when plunging is daily; for twice-a-week plunging, an ice tub plus the money saved is the better deal.
How it stacks up
Against the AS ColdPlunge kit, the Frozin wins on colder water, stronger filtration, and a rigid tub, while the AS kit wins on price and portability. Against the Ice Barrel 300, the Frozin wins for daily use with no ice, while the 300 wins on simplicity, silence, and up-front cost. Against a cheap portable pod, the Frozin wins on every measure except price and portability, which is exactly the trade the bundle asks you to make.
What owners report
Commonly praised
- Chiller holds water cold between sessions with no ice runs at all
- rigid foam-insulated tub feels solid and permanent underfoot
- filtration and pump keep the water clear for longer between changes
Common complaints
- Bundle is heavy and long, so it needs a planned level spot
- chiller adds running cost, noise, and maintenance an ice tub never has
- tall rectangular wall needs a step for shorter users climbing in and out
Recurring themes from owner reviews on retailers and forums, summarised by our editors. Updated October 2026.
Key specifications
- Type
- Rigid tub-plus-chiller bundle
- Capacity
- 100 gallons
- Dimensions
- 48 in L x 28 in W x 28 in H
- Weight
- 90 pounds
- Material
- Foam-insulated roto-molded LDPE
- Chiller
- 0.8 HP, cools to 37F, maker claim
- Filtration
- 20-micron filter, 650 GPH pump
- Fit
- Users up to 6 ft 3 in and 300 pounds
Also consider
AS ColdPlunge Ice Bath Tub and Chiller Kit, 1/3 HP, XL 120 Gallon
The budget chiller kit: a 1/3 HP chiller with pump and filter plus a 120 gallon drop-stitch tub, for ice-free plunging at a lower outlay.
- Type: Inflatable tub-plus-chiller bundle
- Capacity: 120 gallon tub
Ice Barrel 300 Insulated Cold Plunge Tub, 77 Gallon, Charcoal Black
The rigid insulated barrel: a tub-only classic that holds cold water for hours and takes a chiller later if you want one.
- Type: Rigid insulated tub, tub-only, no chiller included
- Capacity: 77 gallons
Research-based assessment. ThePickLedger has not hands-on tested this product; this evaluation synthesizes manufacturer specifications, retailer documentation, and published expert reviews.
Questions, answered
Does the Frozin 400 bundle include the chiller?
Yes, on the style name listed here: Cold Plunge Tub With Chiller. The listing also describes the tub as chiller-ready, so check the style selected at checkout, since tub-only and bundle styles can share a listing page.
How cold does the Frozin chiller get?
Down to 37F on the maker claim. Real results depend on tub size, lid use, and ambient temperature, so keep the lid on between sessions for the fastest cool-down.
Where should the Frozin 400 sit?
On a level, solid surface with power nearby and room to drain: a garage, a gym, a garden, or a patio. It is 48 inches long and 90 pounds, so pick the spot before it arrives rather than after.