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
The Dren KTrain 1HP Hot and Cold Chiller is the better cold plunge chiller overall, rated 3.9 to 3.0. The Active Aqua Chiller with Boost 1 HP costs $40 less ($1,159 vs $1,199).
Active Aqua Chiller with Boost 1 HP
#12 in Over 1/2 HPFull review
A bare 1 HP chiller for a DIY build with your own pump and filter.
Amazon $1,159$1,159
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.
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every over 1/2 HP cold plunge chiller; a clear win is highlighted. How we rank explains each one.
| Factor weight | Dren KTrain 1HP Hot and Cold Chiller | Active Aqua Chiller with Boost 1 HP |
|---|---|---|
| Overall rating | 3.9/5 | 3.0/5 |
| Value 30% | 65 $1,199 per HP ($1,199, 1 HP) | 66 $1,159 per HP ($1,159, 1 HP) |
| Coldest 15% | 50 lowest temperature not published (neutral score used) | 50 lowest temperature not published (neutral score used) |
| Sanitation 10% | 85 filter and ozone | 50 filter and sanitizer not stated (neutral score used) |
| Heating 10% | 100 heats as well | 50 heating not stated (neutral score used) |
| Noise 10% | 95 46 dBA | 50 noise rating not published (neutral score used) |
| Warranty 25% | 50 warranty not published (neutral score used) | 0 1-year warranty |
Specifications
| Dren KTrain 1HP Hot and Cold Chiller | Active Aqua Chiller with Boost 1 HP | |
|---|---|---|
| Cooling | ||
| Compressor | 1 HP | 1 HP |
| Cooling capacity | 9,212 Btu/h | - |
| Heats | Yes | - |
| Water and build | ||
| Filter | Yes | - |
| Sanitizer | Ozone | - |
| App or wifi | Yes | - |
| Noise | 46 dBA | - |
| Warranty | - | 1 year |