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Old 03-10-18, 12:11 PM   #7
ToddT
Lurking Renovator
 
Join Date: Jan 2014
Location: Arkansas
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Over 35 years ago, I read that for every 1/64th inch of buildup, a boiler loses 3% efficiency. That's going from memory but the scale buildup acts as an insulator to inhibit the heat getting to the water.
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