The MiniTherm series residential boilers are Category I (non-positive vent pressure, non-condensing), natural draft appliances. The heat exchanger combines the heat transfer efficiency of integral copper finned tubes with the mass of two cast-iron wet walls surrounding the combustion chamber. The units are available in a range of sizes to suit almost every residential and light commercial heating load while providing operational efficiencies of up to 84.5% AFUE.

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