My 16 year old Ideal Classic boiler had its annual service and MOT yesterday. The engineer left a copy of the flue gas analysis taped to the boiler front which showed a Net Efficiency of 91.1% which I think equates to a Gross Efficiency of 82.8%. Looking back to the original boiler specs, it is listed as having a Gross Efficiency of 76.1%.
I naively thought that a boiler's efficiency would reduce with age. I appreciate that the flue gas analysis was carried out after the burner etc had been cleaned and the boiler checked, but to me the efficiency value looks odd. I have used the same engineer for the past 10 years so I have no reason to believe that his test kit is out of calibration.
Am I missing something or do boilers become more efficient with age?
I naively thought that a boiler's efficiency would reduce with age. I appreciate that the flue gas analysis was carried out after the burner etc had been cleaned and the boiler checked, but to me the efficiency value looks odd. I have used the same engineer for the past 10 years so I have no reason to believe that his test kit is out of calibration.
Am I missing something or do boilers become more efficient with age?
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