$2,290.44
2.6/5
A compact, light heater for spas and above-ground pools, best for owners with Pentair automation.
- 125,000 BTU/hHeating input
- 82%Efficiency
- Natural gas or propaneGas type
- 1 yearWarranty
Check price at Amazon$2,098
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- At 80 lb it is easy to carry and fit on a small equipment pad
- Works with Pentair automation for scheduling and app control
- Low NOx and approved for indoor installs
Cons
- Only a 1 year parts warranty when bought online
- 70 GPM flow limit may need a bypass with a big pump
- Too small to warm a large in-ground pool in reasonable time
The Pentair MasterTemp family
Every Pentair MasterTemp model we rank, smallest first. Ratings compare each against its own size.
| Model | Heating input | Rating | Price |
|---|---|---|---|
| Pentair MasterTemp 125 (this one) | 125,000 BTU/h | 2.6/5 | $2,098 |
| Pentair MasterTemp 250 | 250,000 BTU/h | 2.7/5 | $3,098 |
| Pentair MasterTemp 400 | 400,000 BTU/h | 3.9/5 | $4,079 |
How it scores
The rating comes from 4 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | EC-462024 / EC-462025 |
|---|---|
| Heating | |
| Gas input | 125,000 BTU/h |
| Gas type | Natural gas or propane |
| Thermal efficiency | 82% |
| Condensing | No |
| Low NOx | Yes |
| Max water flow | 70 GPM |
| Installation and controls | |
| Venting | Both |
| Digital controls | Yes |
| Automation or app | Yes |
| Weight | 80 lb |
| Warranty | 1 year |
Alternatives in this size
Hayward H-Series H200FD
A low NOx, salt tolerant spa or small pool heater for owners who buy online and can live with a short warranty.
Amazon $3,699$3,699
Hayward H-Series H150FD
A low NOx, salt tolerant spa or small pool heater for owners who buy online and can live with a short warranty.
Amazon $2,999$2,999
Compare
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