This ultra-efficient, low-maintenance heater is the perfect choice for pools and spas where economic operation or an extended swimming season are a major consideration. An impressive 95% heating efficiency rating  the most efficient available without costly add-ons. A unique forced-air system makes this the ideal heater for use in extreme weather and in difficult or unusual locations. Dual thermostat controls make this an excellent choice for pool/spa combinations. Safe and easy to maintain, the Hi-E2 employs our hot surface ignition system, completely eliminating the pilot light. High-tech composite materials and quality construction make this a very durable unit