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    Benefits from replacing your old boiler system Those not
    Added: 2018-06-29 | Category: boiler service | Comments: 0

    Benefits from replacing your old boiler system. Those not connected to a gas supply. Specifically, afue is the ratio of annual heat output of the furnace or boiler compared to the total annual fossil fuel energy consumed by a furnace or boiler an afue of 90% means that 90% of the energy in the fuel becomes heat for the home and the other 10% escapes up the chimney and elsewhere afue doesn't include the heat losses of the duct system or piping, which can be as.