The MPO-IQ™ 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 MPO-IQ™ has the highest average efficiency in its class. Its rating as high as 87% AFUE, easily exceeds ENERGY STAR levels for efficiency and may qualify for tax credits and/or utility rebates. At the heart of the MPO-IQ™ is an advanced 3-pass cast iron heat exchanger, combined with a well insulated powder-coated steel jacket. Even the MPO-IQ™ control system is best in class. The IQ control system allows the MPO-IQ™ 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.