Pentair MasterTemp 125
A compact, light heater for spas and above-ground pools, best for owners with Pentair automation.
Amazon $2,098$2,098
2.4/5
A low cost heater for above-ground pools and spas outside low NOx areas.
- 105,000 BTU/hHeating input
- 82%Efficiency
- Natural gas or propaneGas type
- 2 yearsWarranty
Check price at Amazon$2,119
Price checked October 31, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Among the cheapest name brand gas heaters, a good match for an above-ground pool
- Two years of parts and labor coverage from an authorized dealer
- Indoor or outdoor installation
- Simple analog control has little to go wrong
Cons
- Not low NOx, so it cannot be installed in California and other strict air districts
- Small input is slow on an in-ground pool
- Warranty is void if the seller is not an authorized Raypak dealer
- No digital display to set an exact temperature
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 | P-R106A |
|---|---|
| Heating | |
| Gas input | 105,000 BTU/h |
| Gas type | Natural gas or propane |
| Thermal efficiency | 82% |
| Condensing | No |
| Low NOx | No |
| Heat exchanger | Copper |
| Max water flow | 70 GPM |
| Installation and controls | |
| Ignition | Electronic |
| Venting | Both |
| Digital controls | No |
| Warranty | 2 years |
Alternatives in this size
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
Hayward H-Series H135FD
An affordable heater for above-ground pools and spas where a short warranty and outdoor only installation are acceptable.
Amazon $2,399$2,399
Compare
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