Pentair Max-E-Therm® Liquid Propane Pool & Spa Heater 400K BTU

The Pentair Max-E-Therm® 400,000 BTU Liquid Propane (LP) Heater is a high-capacity, professional-grade heating system designed to provide rapid temperature elevation for large residential and commercial pools and spas. This model utilizes a sophisticated pre-mixed combustion system that optimizes the propane-to-air mixture for maximum efficiency and faster heat-up times while maintaining a "Low NOx" certification for environmentally friendly operation. Its distinctive, compact housing is manufactured from Dura-Glas™—a high-density, rust-proof composite resin—which ensures the unit remains impervious to the corrosive effects of salt air, pool chemicals, and harsh weather conditions. The internal design features a heavy-duty cupro-nickel heat exchanger, providing enhanced durability and superior resistance to fluctuating water chemistry for a longer operational life. A user-friendly digital control panel offers precise temperature management with dual thermostats for pool and spa settings, while integrated safety sensors and self-diagnostic indicators simplify operation. Despite its streamlined profile, the unit contains a substantial internal firebox and professional-grade plumbing components that provide a solid, industrial build. The Pentair Max-E-Therm 400K BTU Liquid Propane Heater weighs approximately 138 pounds, standing as an ultra-reliable, quiet, and powerful heating solution for high-demand aquatic environments.