Pentair Max-E-Therm® 333 Natural Gas Pool & Spa Heater 333K BTU

The Pentair Max-E-Therm® 333,000 BTU Natural Gas Heater is a high-efficiency heating system designed to provide rapid temperature elevation for mid-to-large sized residential pools and spas. This model utilizes a sophisticated pre-mixed combustion system that optimizes fuel consumption and heating speed, allowing for a "Low NOx" certification that meets stringent air quality standards. 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 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 self-diagnostic indicators simplify routine maintenance. 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 333K BTU Natural Gas Heater weighs approximately 138 pounds, standing as an ultra-reliable, quiet, and powerful heating solution for modern aquatic environments.