250,000 BTU Ultra-high performance in a compact, quiet, and eco-friendly design MasterTemp® Heaters offer all the efficiency, convenience, and reliability features you want in a pool heater, plus a lot more. As Easy to use as your home heating system, plus. user-friendly indicator lights make system operation and monitoring a snap. The compact disign and super-quiet operation won't intrude on your poolside leisure time. An Eco Select™ Brand: MasterTemp® Heaters offer best-in-class energy efficiency. Plus, they are certified for low NOx emissions, making them eco-friendly favorites.