Hayward W3H150FDP Universal H-Series 150,000 BTU Propane Pool and Spa Heater. BEST FOR: In-ground pools and spas with a surface area up to 400 ft. Where natural gas is available. Its low environmental impact makes it ideal for pools and spas located where low-NOx emissions are required. PREMIUM PERFORMANCE: The Hayward Universal H-Series 150,000 BTU Propane Heater delivers premium heating performance for years of reliable, long-lasting comfort. CORROSION PROTECTION: The Universal H-Series boasts exceptional protection against corrosion and premature failure caused by unbalanced water chemistry. ENERGY SAVINGS: The efficient, industry-leading design reduces circulation pump run time to provide energy savings. EASY-TO-USE: Intuitive front control panel provides easy operation, service and maintenance. The Universal H-Series 150,000 BTU Propane Gas Pool & Spa Heater from Hayward provides reliable, long-lasting comfort for pools and spas with a surface area of up to 400 ft. Built with a durable cupro nickel heat exchanger, it offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry, ensuring season after season of premium heating performance. The Universal H-Series boasts industry-leading hydraulic performance coupled with lightning-fast speed-to-heat capability- so you spend less time waiting, and more time swimming. Its low NOx emissions meet air quality standards in all low-NOx areas, so you can rest easy knowing its environmental impact is low, too.