Pentair MasterTemp 400
A strong pick for in-ground pools already on Pentair automation, though online buyers get only a short warranty.
Amazon $4,079$4,079
The Pentair MasterTemp 400 and the Raypak Digital 406A are evenly matched, rated 3.9 and 3.9. The Pentair MasterTemp 400 leads on efficiency and value. The Raypak Digital 406A wins on warranty. The Pentair MasterTemp 400 costs $342.17 less ($4,079 vs $4,421.17).
Raypak Digital 406A
Good value for in-ground pools outside low NOx areas, provided it comes from an authorized dealer so the warranty holds.
Amazon $4,421.17$4,421.17
Prices were last checked October 31, 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 Pentair MasterTemp 400 for efficiency (84% thermal efficiency vs 82% thermal efficiency) and value ($10.20 per 1,000 BTU/h ($4,079, 400,000 BTU/h) vs $11.08 per 1,000 BTU/h ($4,421.17, 399,000 BTU/h)).
- Choose the Raypak Digital 406A for warranty (2-year warranty vs 1-year warranty).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 250,000 BTU and up gas pool heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Pentair MasterTemp 400 | Raypak Digital 406A |
|---|---|---|
| Overall rating | 3.9/5 | 3.9/5 |
| Value 35% | 84 $10.20 per 1,000 BTU/h ($4,079, 400,000 BTU/h) | 74 $11.08 per 1,000 BTU/h ($4,421.17, 399,000 BTU/h) |
| Heating input 25% | 100 400,000 BTU/h | 99 399,000 BTU/h |
| Efficiency 20% | 67 84% thermal efficiency | 33 82% thermal efficiency |
| Warranty 20% | 0 1-year warranty | 50 2-year warranty |
Specifications
| Pentair MasterTemp 400 | Raypak Digital 406A | |
|---|---|---|
| Heating | ||
| Gas input | 400,000 BTU/h | 399,000 BTU/h |
| Gas type | Natural gas or propane | Natural gas or propane |
| Thermal efficiency | 84% | 82% |
| Condensing | No | No |
| Low NOx | Yes | No |
| Heat exchanger | Copper | Copper |
| Max water flow | 120 GPM | 100 GPM |
| Installation and controls | ||
| Ignition | Electronic | Electronic |
| Venting | Both | Both |
| Digital controls | Yes | Yes |
| Automation or app | Yes | Yes |
| Weight | 136 lb | - |
| Warranty | 1 year | 2 years |