The affordable Pentair MasterTemp 125 Natural Gas Pool Heater gives you the energy savings and advanced operating features that were only available from much larger heaters. With its revolutionary premixed gas combustion technology, it offers 82% thermal efficiency—the highest of any heater in its category.
- Natural gas model with cord
- 125,000 BTU rating
- 82% energy efficiency
- High-performance, affordable heating with premium features
- 1-½" plumbing
- Ideal for smaller bodies of water up to 15,000 gallons
- For above ground and inground pools
- Pre-mixed combustion technology for ultra-fast heat-up
- Rotating digital display - the first in its price category - provides fast, easy access for programming and monitoring
- Certified for low NOx emissions
- Certified for outdoor and indoor - vented installations
Click here to download the manual
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Replaced Older MasterTemp 125
Existing MasterTemp125 reached it’s end of life, so ordered the same unit. The unit shipped quickly, arrived with no damage. It connected up easily, fired up with no issues and is now heating our jacuzzi. Very satisfied.

Trouble free!
Bought for Father’s Day. Had a rebuilt Laars that needed gone. I do Boilers and heaters daily. Found Pentair 125. Love the premix burner. Way better! Love control panel. It holds history of runs and hours. Lights up for night. All limits and safeties respond and report. Fine little machine.

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