Pentair MasterTemp 125 Gas Pool Heater

The MasterTemp 125 is Pentair's compact entry-level gas heater, sized for pools up to 15,000 gallons where a low-profile footprint matters more than raw output. An 82% thermal efficiency rating and 3/4-inch gas line compatibility (rated to 50 ft of run) make it straightforward to retrofit into an existing pad, and the LCD controller puts setpoint and diagnostics on a simple digital readout instead of a dial.

• 82% thermal efficiency rating
• Sized for pools up to 15,000 gallons
• Runs on natural gas or LP (fuel-specific SKUs); 3/4-inch gas line supported up to 50 ft
• 1-1/2 inch plumbing connections for straightforward pad integration
• UL/cUS listed and Low NOx certified
• LCD digital controller for setpoint and status