Natural gas space heaters
sylvan butler wrote:
If the $1275 DV-20E 81.5%-efficient direct vent and $3268 93%-efficient
Mantis condensing gas heaters are measured with LHV-based efficiencies
and we subtract 11% to compare apples to apples, the $229 vent-free
heater is more efficient, as well as a lot cheaper.
The 93% and 81.5% already account for the 11% loss in non-condensing.
I finally heard from the manufacturer, who tested all of them with gas
with a heating value of 1035 vs 930 Btu/ft^3, ie the HHV.
Nick
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