Burnham® ES24BNI-T ES2™ 4-Section Gas-Fired Steam Boiler With Intelligent Hydronic Control and Vent Connector, Natural Gas Fuel, 77 mbh Net IBR, 105 mbh Input, Chimney Vent, Cast Iron, 1-1/4 in NPT Connection, Electronic Ignition, Domestic

The ES2™ blends unmatched performance with long lasting durability and exclusive energy saving features. Designed as an optimal replacement boiler for millions of homes with existing chimneys, the ES2™ achieves an 85% AFUE. At the heart of the ES2™ is one of the most advanced cast iron heat exchangers in the industry and a well-insulated heavy-duty steel base for longevity. Even the ES2™'s control system is class leading. The IQ Boiler Control System allows the ES2™ to be easily equipped with an optional energy saving control package that can achieve up to a 15 to 20% reduction in fuel consumption according to most studies.