Check the listing for details. Pentair MasterTemp, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater EC-462029. Color: Tan, Condition: New. Listed at 4789.00 USD. With the Pentair MasterTemp Propane Gas 400K BTU High Performance Pool and Spa Heater, experience the revolutionary pool heating technology that brings you quieter and more efficient energy-savings to your pool and spa. Being the most sold heater on the market, Pentair MasterTemp pool and spa heaters prove their worth. They have established a reputation of being more dependable and reliable than other heaters in its class. LCD digital display controls and LED indicator lights make for a user-friendly operation experience. Pentair MasterTemp Design The Pentair - EC-462029 MasterTemp 400K BTU Propane Gas Pool & Spa Heater is manufactured to keep a low profile and maintain the water at a comfortable temperature of your choosing.With the Pentair MasterTemp Propane Gas 400K BTU High Performance Pool and Spa Heater, experience the revolutionary pool heating technology that brings you quieter and more efficient energy-savings to your pool and spa. Being the most sold heater on the market, Pentair MasterTemp pool and spa heaters prove their worth. They have established a reputation of being more dependable and reliable than other heaters in its class. LCD digital display controls and LED indicator lights make for a user-friendly operation experience. Pentair MasterTemp Design The Pentair - EC-462029 MasterTemp 400K BTU Propane Gas Pool & Spa Heater is manufactured to keep a low profile and maintain the water at a comfortable temperature of your choosing.