MasterTemp 125 Propane

Manufactured by Pentair, Northern Lights Group now offers the most advanced propane heater available on the market.

This heater is a compact, self-contained unit with an output of 125,000 BTU's. With a thermal efficiency rating of 82%, the MasterTemp 125 is the most efficient heater in it's class. This high efficiency rating keeps operating cost low by directing more of the heat it produces into your pool or hot tub instead of the outside air. Recommended for heating up to 15,000 Gallon pool or hot tubs.

Featuring the first ever rotating digital display offered in its class, the MasterTemp 125's display provides valuable information at the touch of a button. This heater's lightweight and compact design makes the MasterTemp 125 heater the easiest to install in its class, which reduces install time and labor costs.

High-Performance Propane Heating for Swim Spas & Plunge Pools

For owners without access to Natural Gas, the Pentair MasterTemp 125 (Propane) is the gold standard in efficient, rapid heating.

Delivering a punchy 125,000 BTUs, this unit is perfectly sized for bodies of water up to 15,000 Gallons. It bridges the gap between slow electric heaters and massive commercial gas units, making it the ideal choice for Swim Spas, Large Cedar Tubs, and Above-Ground Pools.

82% Thermal Efficiency (Eco Select)

Stop burning money. The MasterTemp 125 is engineered with pre-mixed combustion technology that achieves an 82% Efficiency Rating—the highest in its class.

• Fast Heat Up: Heats water significantly faster than electric heat pumps, allowing you to bring a spa up to temperature in minutes, not hours.

• Eco-Friendly: Certified as an "Eco Select" product for low NOx emissions and reduced energy consumption.

Built "Tank-Tough"

Unlike cheap plastic heaters, Pentair uses commercial-grade components in this compact chassis.

• Bronze Header System: The critical connection point is made of corrosion-resistant bronze, ensuring longevity even with chemically treated water.

• Thermostatic Bypass: This smart internal valve controls water flow to prevent condensation inside the combustion chamber. By stopping condensation, it prevents the #1 cause of heater failure: internal rust and scaling.

User-Friendly Intelligence

• Rotating Digital Display: Plumbing layouts can be tricky. Pentair’s innovative display rotates to 3 positions, so you can always read your temperature and diagnostics right-side up, no matter how the unit is installed.

• Whisper Quiet: The fully enclosed cabinet and pre-mixed combustion make this one of the quietest gas heaters on the market, preserving your backyard peace.