Over 1/2 HP suits bigger tubs and stock tanks, hot climates, tubs in the sun and households taking plunges back to back. They recover faster after each use and reach the coldest temperatures, at a higher price and power draw.
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.
Full ranking 12
- 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 - Fox Plunge 1HP Cold Plunge Chiller#6 of 12Full review
A low-priced 1 HP chiller for a big tub, without the sanitizer or app of pricier units.
Amazon $669.95$669.951 HP-39 °F - PlungeFit 1 HP Cold Plunge Chiller#7 of 12Full review
A no-frills 1 HP kit that fits almost any tub, including a home bathtub.
Amazon $829$8291 HP-37 °F - X-Vitalis 1.5HP Cold Plunge Chiller#8 of 12Full review
A heavy 1.5 HP hot and cold unit, but at this price the listing leaves too much unsaid.
Amazon $2,000$2,0001 1/2 HP9,000 Btu/h- - SaunaSpa Gale 1 HP Chiller and Heater#9 of 12Full review
A powerful hot and cold unit for a large tub, with ozone and app control. The short warranty in the manual is the catch.
SaunaSpa $2,624.25$2,624.251 HP10,407 Btu/h37 °F - Beyond Marina 1 HP Hot and Cold Chiller#10 of 12Full review
A hot and cold 1 HP unit with ozone and wifi, but other 1 HP units cool more for less.
Amazon $1,299.99$1,299.991 HP8,206 Btu/h- - Plunge Pro Chiller#11 of 12Full review
An upgrade or replacement chiller for owners of Plunge tubs who want app control and ozone. Buyers with other tubs pay a lot for the name.
Plunge $3,990$3,9903/4 HP-37 °F - Active Aqua Chiller with Boost 1 HP#12 of 12Full review
A bare 1 HP chiller for a DIY build with your own pump and filter.
Amazon $1,159$1,1591 HP--
