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 Dren KTrain 1HP Hot and Cold Chiller leads on value and heating. The Dren KTrain 1HP Hot and Cold Chiller costs $2,791 less ($1,199 vs $3,990).
Plunge Pro Chiller
#11 in Over 1/2 HPFull 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$3,990
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 value ($1,199 per HP ($1,199, 1 HP) vs $5,320 per HP ($3,990, 3/4 HP)) and heating (heats as well vs cools only).
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 | Plunge Pro Chiller |
|---|---|---|
| Overall rating | 3.9/5 | 3.0/5 |
| Value 30% | 65 $1,199 per HP ($1,199, 1 HP) | 5 $5,320 per HP ($3,990, 3/4 HP) |
| Coldest 15% | 50 lowest temperature not published (neutral score used) | 100 down to 37 °F |
| Sanitation 10% | 85 filter and ozone | 85 filter and ozone |
| Heating 10% | 100 heats as well | 0 cools only |
| Noise 10% | 95 46 dBA | 50 noise rating not published (neutral score used) |
| Warranty 25% | 50 warranty not published (neutral score used) | 50 warranty not published (neutral score used) |
Specifications
| Dren KTrain 1HP Hot and Cold Chiller | Plunge Pro Chiller | |
|---|---|---|
| Cooling | ||
| Compressor | 1 HP | 3/4 HP |
| Cooling capacity | 9,212 Btu/h | - |
| Lowest temperature | - | 37 °F |
| Heats | Yes | No |
| Water and build | ||
| Filter | Yes | Yes |
| Sanitizer | Ozone | Ozone |
| App or wifi | Yes | Yes |
| Noise | 46 dBA | - |