Product Review · Saunas & Cold Plunges · #5 Ranked
Rezvani Frozin 400 + Chiller
100-gallon insulated plunge tub with 0.8 HP chiller · Reviewed by Katie · amazon.com live, Sept 24 2026
Why it scored a 79
This is the Frozin 400 tub with a chiller, filter and pump in one order, and it is the only plunge here rated down to 37°F without ice. Quality scores 88 for the made-in-USA roto-molded, foam-insulated shell, and Features 88 for the 0.8 HP chiller, 20-micron filtration and 650 GPH pump. Satisfaction is 90, though that 4.7 rests on just 17 ratings. Warranty is the lowest factor at 40 because the listing publishes no terms, and Value is 74: at $1,949.99 it costs more than four times the 1stplunge kit.
What you're getting
- 100-gal (400-qt) roto-molded LDPE tub, fully foam insulated
- 0.8 HP chiller cools water to 37°F
- 20-micron filtration with 650 GPH pump
- 48 x 28 x 28 inches; tub weighs 90 lb
- Fits users up to 6 ft 3 in and 300 lb
- 3/4-inch inlet and outlet ports
- Tub made in the USA
- No warranty terms on listing; only 17 ratings
ViperScore breakdown
At a glance
- 100 gal, cools to 37°F
- 0.8 HP chiller, 20-micron filter
- Made-in-USA roto-molded tub
- Price$1,949.99
- Tier100-gallon insulated plunge tub with 0.8 HP chiller
- Category rank#5 of 10
Should you buy the Rezvani Frozin 400 + Chiller?
The Rezvani Frozin 400 + Chiller is for someone who plans to plunge daily, wants a hard insulated tub and never wants to buy ice again. At $1,949.99 it ranks #5 of 10 in our Saunas & Cold Plunges category. If you already own a chiller, the Rezvani Frozin 400 Tub alone is $899.99. On a tighter budget, the 1stplunge 148-Gal Tub + Chiller Kit gets to 42°F for $449.00.
Where it earns its score
- Coldest water here. The 0.8 HP chiller is rated down to 37°F, 5°F colder than the 1stplunge kit's 42°F.
- Hard insulated shell. A roto-molded LDPE body with full foam insulation holds temperature better than the fabric and inflatable tubs in this group.
- Filtration included. Every chiller order comes with 20-micron filtration and a 650 gallon-per-hour pump.
- Sized for big users. Rezvani rates it for users up to 6 ft 3 in and 300 lb.
What to know first
- Warranty is the lowest factor at 40. The listing gives no warranty terms for the tub or the chiller; get them in writing before paying $1,949.99.
- Check with your doctor first. If you have a heart condition, are pregnant or take medication that affects heat or cold tolerance, talk to your doctor before any cold plunge.
- Thin review history, unstated power. Only 17 ratings so far, and the listing does not state the chiller's electrical draw. Plan for a dedicated GFCI outlet and confirm the amperage with the seller.
Our verdict
The Rezvani Frozin 400 + Chiller scores 79, a Fair Buy ranked #5, on Satisfaction (90), Quality (88) and Features (88). Warranty (40) and Value (74) hold it back. Buy it if you want the coldest water and the toughest tub in one order. If $1,949.99 is too much, the 1stplunge 148-Gal Tub + Chiller Kit (77) does the job for $449.00.
1stplunge 148-Gal Tub + Chiller Kit
Questions buyers ask
How cold does the Frozin 400 chiller get?
The included 0.8 HP chiller is rated to cool the water to 37°F.
What is the difference between the two Frozin 400 listings?
Same 100-gallon tub. This version adds the 0.8 HP chiller, 20-micron filter and 650 GPH pump for $1,050 more.
How big is the Frozin 400 cold plunge?
48 x 28 x 28 inches and 100 gallons, rated for users up to 6 ft 3 in and 300 lb.
Ready to check it out?
Rezvani Frozin 400 + Chiller · ViperScore 79 · Fair Buy · $1,949.99
How the other 9 saunas & cold plunges scored
86Dynamic Saunas Andora 2-Person
84Dynamic Saunas Elite 1-Person
84Dynamic Saunas Heming 2-Person
83Lifepro RejuvaWrap Sauna Blanket
771stplunge 148-Gal Tub + Chiller Kit
76AudaciaGo XXL Inflatable Plunge
76Rezvani Frozin 400 Tub
75The Cold Pod 85-Gal Tub
70SereneLife SLISAU30BK Sauna Tent
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