With the Pentair MasterTemp Natural Gas 250K 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. 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-462026 MasterTemp 250K BTU Natural Gas Pool & Spa Heater is manufactured to keep a low profile and maintain the water at a comfortable temperature of your choosing.