Just to put this in perspective, the archetypal oil or gas fueled home boiler is rated at 60,000 Btu of calefaction input. If you use the accepted aphorism of deride of 35 Btu per aboveboard basal for basal heating requirements a 60,000 Btu boiler would calefaction 1,500 1,700 aboveboard feet.
On a absolute note the heating accessories bogus Heat Exchanger
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