Pentair ETi 400 ASME High Efficiency Pool & Spa Heater, Natural Gas, 400K BTU, 120/240V 60Hz, 461113

A Better Heater Is A Better Pool, The ETi 400 efficiently heats your pool with a blazing-fast performance to reach your target temperature in a snap. Equipped with the industry-exclusive TitanTough Direct-Fire Titanium Heat Exchanger, the toughest heat exchanger ever built, the ETi 400 can deliver years of reliable heating. And with 96% thermal efficiency, more of every dollar you spend goes directly into heating your pool. Paired with simplified installation and an ultra-quiet noise level, the ETi 400 can make your backyard oasis warmer and cozier for years to come.