The Pentair EC462025 MasterTemp Natural Gas Pool and Spa Heater is the definition of efficiency, convenience, and reliability. This small-but-mighty heater is user-friendly with safety features you can rely on to keep your system running smoothly. Powered by natural gas and boasting 125,000 BTUs, this pool heater will keep your pool at the perfect temperature so you can always enjoy pool time. Suitable for smaller bodies of water, this compact pool heater can warm pools with up to 15,000 gallons of water. This swimming pool heater may be small, but it has 82-percent efficiency as compared to larger pool heaters. The housing design is built with corrosion and UV-resistance for lasting durability, while the handy safety features ensure your unit doesn't overheat and is easy to shut off when servicing is needed. This pool and spa heater includes an easy-to-read, rotatable digital display and user-friendly indicator lights for simple system operation and monitoring. Best of all, the quiet operation makes sure not to impose on leisure pool time. User-friendly and powerful, this Pentair MasterTemp Natural Gas Pool and Spa Heater won't disappoint.