Fire-tube boiler from Lochinvar
RBI’s FlexCore 1.5 is built for performance and longevity with symmetrical fire-tube technology. It achieves 95.1% AHRI-certified efficiency and utilizes a precisely temperature-balanced flex-core heat exchanger. It essentially “scrubs” all heat out of the combustion gases, resulting in a compact footprint while absorbing all expansion and contraction with no stress on the tubes. Inside, each tube has been formed in a patented shape that is compressed and dimpled, such that high gas-side film coefficients are created.