Head to head
Frozin 400 vs AS ColdPlunge Chiller Kit (2026)
Frozin 400 vs AS ColdPlunge chiller kit: the premium rigid bundle against the budget inflatable kit, compared on cooling, tub, and running costs.
#2 in our rankings · Best tub-plus-chiller bundle
REZVANI Frozin 400 Cold Plunge Tub with Water Chiller, 100 Gallon
Best for: Daily plungers who want a fixed temperature on tap and never want to buy, haul, or melt bags of ice again.
#6 in our rankings · Best budget chiller kit
AS ColdPlunge Ice Bath Tub and Chiller Kit, 1/3 HP, XL 120 Gallon
Best for: Buyers who want a chiller but cannot stretch to a premium bundle, and who accept a slower cool-down and a lower cold floor.
Our recommendation
Buy the Frozin 400 if you want the coldest water, the strongest filtration, and a rigid tub for a permanent daily setup. Buy the AS ColdPlunge kit if you want chilled water at a lower outlay and can accept 42F instead of 37F, a slower cool-down on a full tub, and an inflatable tub rather than a rigid one.
Cooling power and cold floor
The Frozin 0.8 HP chiller cools to 37F on the maker claim, against 42F for the AS 1/3 HP chiller. That five-degree gap matters to buyers chasing the coldest plunge, though both are cold enough for a proper session. The Frozin also cools its 100 gallons directly, while the AS chiller is rated to cool up to 79 gallons in a 120 gallon tub, so a full AS tub cools more slowly.
Rigid tub against inflatable tub
The Frozin tub is foam-insulated roto-molded LDPE: rigid, permanent, and the better insulator. The AS tub is a drop-stitch inflatable: firmer than a standard pod and portable, but still a soft-sided tub that needs drying and care. A permanent setup favours the Frozin; a setup that might move favours the AS kit.
Filtration and running costs
The Frozin pairs 20-micron filtration with a 650 gallon per hour pump, the strongest water care on this list. The AS kit has a built-in pump and a reusable stainless steel filter with no disposable cartridges, which is simpler and cheaper to run. Both need regular water changes and sanitiser; neither replaces water care entirely.
Choose REZVANI Frozin 400 Cold Plunge Tub with Water Chiller, 100 Gallon if…
- You want the coldest water on this list
- You want a rigid permanent tub with the strongest filtration
- You plunge daily and want the fastest cool-down
Choose AS ColdPlunge Ice Bath Tub and Chiller Kit, 1/3 HP, XL 120 Gallon if…
- You want chilled water at a lower outlay
- You want a portable kit you can move or store
- You prefer a reusable filter with no cartridges to buy
Spec-by-spec comparison
| Spec | REZVANI Frozin 400 Cold Plunge Tub with Water Chiller, 100 Gallon | AS ColdPlunge Ice Bath Tub and Chiller Kit, 1/3 HP, XL 120 Gallon |
|---|---|---|
| Price tier | Premium | Mid-range |
| Type | Rigid tub-plus-chiller bundle | Inflatable tub-plus-chiller bundle |
| Capacity | 100 gallons | 120 gallon tub |
| Dimensions | 48 in L x 28 in W x 28 in H | - |
| Weight | 90 pounds | 60 pounds |
| Material | Foam-insulated roto-molded LDPE | - |
| Chiller | 0.8 HP, cools to 37F, maker claim | 1/3 HP, cools up to 79 gallons to 42F |
| Filtration | 20-micron filter, 650 GPH pump | - |
| Fit | Users up to 6 ft 3 in and 300 pounds | Users up to 6 ft 9 in |
| Tub size | - | 35.4 in diameter x 31.5 in high |
| Tub build | - | Drop-stitch walls, reinforced fiberglass and PVC |
| Included | - | Chiller, tub, step stool, lid, hoses, hand pump, repair kit |
| Best for | Daily plungers who want a fixed temperature on tap and never want to buy, haul, or melt bags of ice again. | Buyers who want a chiller but cannot stretch to a premium bundle, and who accept a slower cool-down and a lower cold floor. |
| Skip if | You only plunge occasionally, or you have no outdoor power point near where the tub will sit. | You want the coldest water on this list, or you need a rigid tub rather than an inflatable one. |
Strengths and limitations
REZVANI Frozin 400 Cold Plunge Tub with Water Chiller, 100 Gallon
Strengths
- 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.
Limitations
- 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.
AS ColdPlunge Ice Bath Tub and Chiller Kit, 1/3 HP, XL 120 Gallon
Strengths
- The 1/3 HP chiller cools water down to 42F and holds it there automatically, so no ice is needed once it is running.
- The drop-stitch tub walls form a solid upright shape that feels firmer than a standard inflatable pod.
- A built-in pump and a reusable stainless steel filter keep the water cleaner with no disposable cartridges to buy.
Limitations
- The chiller is rated to cool up to 79 gallons, less than the tub full 120 gallon volume, so a full tub cools more slowly.
- At 42F it does not reach as cold as the Frozin bundle, so buyers chasing the coldest plunge should look there.
- The kit has many parts, hoses, valves, a step stool, and a pump, so setup and storage take more time than a simple tub.
How they fit the wider field
- REZVANI Frozin 400 Cold Plunge Tub with Water Chiller, 100 Gallon: ranked #2 (Best tub-plus-chiller bundle) in The Best Cold Plunge Tubs. Read the full REZVANI Frozin 400 Cold Plunge Tub with Water Chiller, 100 Gallon review.
- AS ColdPlunge Ice Bath Tub and Chiller Kit, 1/3 HP, XL 120 Gallon: ranked #6 (Best budget chiller kit) in The Best Cold Plunge Tubs.
Neither one quite right? The full rankings cover 10 picks matched to different buyers.
Made your call?
Questions, answered
Is 42F cold enough for a cold plunge?
Yes. Most plungers work between 50F and 59F when starting out, and 42F is colder than most people need. The Frozin 37F floor matters mainly to experienced plungers chasing maximum cold, not to beginners.
Which kit is easier to set up?
The AS kit has more parts: hoses, valves, a step stool, and a pump, so setup takes longer. The Frozin is heavier to place but simpler once it sits, since the tub and chiller are built to work together.