Radiant Floor Heating added in a 100-yr old house
They mean burner efficiency, not boiler efficiency. Testing a burner is
fairly easy , testing efficiency of a boiler gets into alot of
parameters and time. It is likely an 77-80 % unit overall at that age.
You can have an 87% efficient flame and a 60% efficent boiler design
,for example. Non condensing wont be over apx 83%.
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