Pentair UltraTemp 140
#12 in Large PoolsFull review
For large pools or pool-and-spa setups that need a lot of heat from one single-phase unit, ideally on Pentair automation.
Amazon $6,999$6,999
3.2/5
For a pool and spa owner who wants one unit to heat in spring and fall and chill a cold plunge in summer.
- 120,000 BTUOutput (80 °F air)
- 5.7COP (80 °F air)
- 75,000 BTUOutput (50 °F air)
- Single speedCompressor
- 40 °FRuns down to
- 5 yr compressorWarranty
Check price at Hayward
Price checked October 26, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Heats, cools, and chills a spa or plunge pool down to 40 °F
- Active defrost keeps it heating down to 40 °F air
- A 40 A breaker is enough, so it often fits an existing panel
Cons
- Keeps about 62% of its output in 50 °F air
- Sold only through pool dealers, with no published price
- No Wi-Fi or app; automation can only switch it on and off
The Hayward HeatPro MCHX family
Every Hayward HeatPro MCHX model we rank, smallest first. Ratings compare each against its own pool size.
| Model | Output (80 °F air) | Rating | Price |
|---|---|---|---|
| Hayward HeatPro MCHX 110,000 BTU | 110,000 BTU | 3.1/5 | $5,729 |
| Hayward HeatPro MCHX 110K Heat+Chill | 110,000 BTU | 3.3/5 | - |
| Hayward HeatPro MCHX 120K Heat+Chill (this one) | 120,000 BTU | 3.2/5 | - |
| Hayward HeatPro MCHX 120,000 BTU | 120,000 BTU | 3.2/5 | - |
| Hayward HeatPro MCHX 140K Heat+Chill | 135,000 BTU | 3.2/5 | - |
| Hayward HeatPro MCHX 140,000 BTU | 138,000 BTU | 3.0/5 | $6,999 |
How it scores
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its pool size. How we rank explains each one.
Specifications
| Model number | HP31205T |
|---|---|
| Heating ratings | |
| Output, 80 °F air / 80% RH / 80 °F water | 120,000 BTU |
| COP, 80 °F air | 5.7 |
| Output, 50 °F air / 63% RH / 80 °F water | 75,000 BTU |
| COP, 50 °F air | 4 |
| Output kept at 50 °F | 62% |
| AHRI certified | Yes |
| Compressor | Single speed |
| Lowest operating air temperature | 40 °F |
| Defrost | Yes |
| Heat and cool | Yes |
| Installation | |
| Power | 230 V, 65 A breaker |
| Water flow | 30 to 75 gpm |
| Heat exchanger | titanium |
| Refrigerant | R-410A |
| Size (W × D × H) | 30.5 × 33.6 × 44 in |
| Weight | 240 lb |
| Features | |
| Wi-Fi | No |
| Warranty and models | |
| Warranty | 5 yr compressor, 5 yr parts, 2 yr labor, 10 yr heat exchanger |
| Warranty terms | Expert Line in-ground heat pumps (2026 terms): 5 years parts (compressor included), 2 years field labor (3 years from a Hayward Rewards/Totally Hayward partner), titanium tube 10 years; bought from Hayward or an authorized seller. The online W3 (Open Line) version is 1 year parts only, no labor. |
| Released | 2024-05 |
Alternatives in this pool size
AquaCal HeatWave HW160R
#13 in Large PoolsFull review
A high-output AquaCal for large in-ground pools, slotting between the SQ140R and SQ200R in size.
HVACDirect $5,316$5,316
Hayward HeatPro MCHX 140K Heat+Chill
#15 in Large PoolsFull review
For a large pool with a spa or cold plunge, where one unit has to heat in the shoulder seasons and chill in summer.
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