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Posted by HeatPro on November 02, 2005 at 16:28:37:
In Reply to: old boiler posted by JohnWill65 on November 02, 2005 at 13:14:48:
Coal boilers were about 45% efficient to allow the fly ash to pass through without having to clean the exchanger every month. When the boiler had gas installed, there was no radiant heat component of the flame, so the passages alone had to absorb the heat, thus the efficiency dropped to somewhere about 30%. When gas was relatively inexpensive, it didn't matter. The plumber just wasn't old enough to know, nor used instruments to find out.