Pentair MasterTemp, Low NOx, 400K BTU, Propane Gas, Pool & Spa Heater EC-462029. 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. 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. 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. The compact design allows the heater to be tucked away for a sleek, aesthetic pool and spa equipment pad layout. MasterTemp heaters are built to be super-quiet, helping maintain a tranquil poolside experience. Pentair MasterTemp features a rotatable keypad for easy access in any orientation it is in. With a hot surface ignition (no pilot light) and pushbutton, digital controls, MasterTemp is as easy to operate as your home heating system. Advantages of a Heated Pool & Spa. A great reason for having a pool heater like the Pentair MasterTemp is the ability to swim at any time of day or in any season by controlling the temperature of the water to its desired level. This makes for a more enjoyable pool experience, granting the option to swim through more periods of the year. With a Pentair MasterTemp heater you get just that. The more efficient a gas pool heater is, the lower the cost is to operate it. This also means the less time it needs to run to deliver the same amount of heat for your pool water. How does that work? Pentair MasterTemp High Performance Pool & Spa Heater. Pentair MasterTemp heaters offer all the efficiency, convenience and reliability features you want in a pool heater, plus a lot more. Operation is as seamless as using your home heating system. Have a salt water chlorinated pool? The Pentair MasterTemp HD Heavy Duty heater model, featuring a corrosion-resistant Cupro-Nickel heat exchanger, is also available. Pentair also offers an ASME rated MasterTemp pool and spa heater for commercial applications.