Pentair MasterTemp® Natural Gas High Performance Heater 250HD BTU

The Pentair Max-E-Therm® 400,000 BTU Natural Gas Heater is an industry-leading, high-output heating system engineered to provide the fastest possible heat-up times for large residential and commercial pools and spas. This powerhouse features a high-efficiency pre-mixed combustion system that optimizes fuel use while maintaining a "Low NOx" certification for environmentally friendly operation. Designed with a distinctively sleek, matte-black enclosure made of Dura-Glas™—a high-grade, rust-proof composite resin—the Max-E-Therm is built to survive the harshest outdoor elements and corrosive pool environments. Its internal components include a heavy-duty cupro-nickel heat exchanger that provides superior resistance to fluctuations in water chemistry, ensuring a long operational life. The unit is equipped with an intuitive digital control panel that offers precise temperature management and dual thermostats for pool and spa combinations, along with advanced self-diagnostic features for easy maintenance. Despite its compact design compared to older, bulky metal heaters, the substantial internal firebox and industrial-grade plumbing give it a solid, professional-grade build. The Pentair Max-E-Therm 400K BTU Natural Gas Heater weighs approximately 138 pounds, serving as an ultra-efficient, durable, and rapid heating solution for high-demand aquatic environments.