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 3.6. The Dren KTrain 1HP Hot and Cold Chiller leads on sanitation. The GRAT 1.5HP Cold Plunge Chiller wins on value. The GRAT 1.5HP Cold Plunge Chiller costs $400 less ($799 vs $1,199).
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
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.
Which should you buy?
- Choose the Dren KTrain 1HP Hot and Cold Chiller for sanitation (filter and ozone vs filter).
- Choose the GRAT 1.5HP Cold Plunge Chiller for value ($533 per HP ($799, 1 1/2 HP) vs $1,199 per HP ($1,199, 1 HP)).
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 | GRAT 1.5HP Cold Plunge Chiller |
|---|---|---|
| Overall rating | 3.9/5 | 3.6/5 |
| Value 30% | 65 $1,199 per HP ($1,199, 1 HP) | 97 $533 per HP ($799, 1 1/2 HP) |
| Coldest 15% | 50 lowest temperature not published (neutral score used) | 100 down to 36 °F |
| Sanitation 10% | 85 filter and ozone | 50 filter |
| 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 | GRAT 1.5HP Cold Plunge Chiller | |
|---|---|---|
| Cooling | ||
| Compressor | 1 HP | 1 1/2 HP |
| Cooling capacity | 9,212 Btu/h | 10,500 Btu/h |
| Lowest temperature | - | 36 °F |
| Heats | Yes | - |
| Water and build | ||
| Filter | Yes | Yes |
| Sanitizer | Ozone | - |
| App or wifi | Yes | Yes |
| Noise | 46 dBA | - |
| Warranty | - | 1 year |