Dren KTrain 1HP Hot and Cold Chiller
#1 in Over 1/2 HPFull review
A quiet 1 HP hot and cold chiller, if you can live without a stated warranty.
Amazon $1,199$1,199
A chiller turns any tub, barrel or stock tank into a cold plunge you don’t have to fill with ice. These rankings compare what the makers publish on the same terms: how much compressor you get for the money, how cold the water gets, how it keeps the water clean, whether it heats too, how loud it is and how long it’s covered.
Size is the first choice. A 1/4 or 1/3 HP chiller holds a one-person tub of about 100 gallons near 40 °F indoors or in the shade. In a hot climate, in the sun, or for a bigger tub or several plunges back to back, go to 1/2 HP or more.
Clean water is the second. A filter and an ozone or UV sanitizer let the water go weeks between changes; without them you change it far more often.
Heating turns the same tub into a warm soak, which some chillers do and some don’t.
Top Picks
GRAT 1.5HP Cold Plunge Chiller
#4 in Over 1/2 HPFull review
The cheapest way here to a big cooling number, for large tubs in warm places.
Amazon $799$799
TURBRO FrostCore F85
#2 in Over 1/2 HPFull review
A strong 1 HP pick for a big tub or a hot climate, with ozone and app control included. Check the warranty with the seller before buying.
Amazon $1,299$1,299
Shop by Size
Up to 1/2 HP
15 rankedUp to 1/2 HP: one-person tubs and barrels of about 100 gallons, indoors or in the shade.
Top rated: AQOVOR 1/3 HP Cold Plunge Chiller $279.99
Over 1/2 HP
12 rankedOver 1/2 HP: bigger tubs, stock tanks, hot climates and back-to-back plunges.
Top rated: Dren KTrain 1HP Hot and Cold Chiller $1,199
Narrow It Down
By budget
By feature
Deals
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Best Small Cold Plunge Chillers
- AQOVOR 1/3 HP Cold Plunge Chiller#1 of 15Full review
A budget chiller for a small tub indoors, where 42 F is cold enough.
Amazon $279.99$279.991/3 HP-42 °F - EONIX 1/2 HP Ice Bath Chiller#2 of 15Full review
A cheap 1/2 HP kit for a large inflatable tub where 42 F is enough.
Amazon $449.99$449.991/2 HP-42 °F - EONIX 1/3 HP Ice Bath Chiller#3 of 15Full review
A basic small chiller for a one-person tub of up to about 80 gallons.
Amazon $369.99$369.991/3 HP-42 °F - Healcryo 0.5 HP Ozone Chiller#4 of 15Full review
A low-cost way to keep a small one-person tub cold with ozone included.
Amazon $496.95$496.951/2 HP4,000 Btu/h38 °F - SereneLife 1/2 HP Chiller System#5 of 15Full review
A basic 1/2 HP kit with pump and filter. Others at this price add ozone and wifi.
Amazon $882.99$882.991/2 HP-39.2 °F
Best 3/4 HP and 1 HP Cold Plunge Chillers
- Dren KTrain 1HP Hot and Cold Chiller#1 of 12Full review
A quiet 1 HP hot and cold chiller, if you can live without a stated warranty.
Amazon $1,199$1,1991 HP9,212 Btu/h- - TURBRO FrostCore F85#2 of 12Full review
A strong 1 HP pick for a big tub or a hot climate, with ozone and app control included. Check the warranty with the seller before buying.
Amazon $1,299$1,2991 HP9,553 Btu/h36 °F - Icebound Essentials 1HP Hot + Cold#3 of 12Full review
A full-featured hot and cold 1 HP chiller for tubs of 100 gallons or more, at a premium price.
Amazon $2,499.99$2,499.991 HP-37 °F - GRAT 1.5HP Cold Plunge Chiller#4 of 12Full review
The cheapest way here to a big cooling number, for large tubs in warm places.
Amazon $799$7991 1/2 HP10,500 Btu/h36 °F - ALEKO 1 HP Chiller and Heater#5 of 12Full review
A hot and cold unit with ozone and wifi, but cheaper chillers publish more and promise as much.
Amazon $2,699$2,6991 HP-35.6 °F
How We Rank
Each chiller is ranked against others of similar size, and scored on its price per horsepower of compressor, the lowest temperature it holds, its filter and sanitizer, whether it heats, its noise rating and its warranty.
| Factor | Measures | Weight |
|---|---|---|
| Value | price per horsepower of compressor | 30% |
| Coldest | lowest water temperature it holds | 15% |
| Sanitation | filter and ozone or UV sanitizer included | 10% |
| Heating | heats as well as cools | 10% |
| Noise | rated sound level | 10% |
| Warranty | warranty on the chiller | 25% |
How we rank explains each factor in full.