Thermal Efficiency Comparison

 

 

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The above chart compares the thermal efficiencies of a typical natural
gas-fired boiler and an electric boiler. Note the electric boiler reaches
an efficiency of 99% at only 30% full load while the gas boiler is
negatively impacted at lower output due to having to heat excess air
in order to maintain proper combustion.

The electric boiler has no stack losses and experiences very little
“skin” heat loss. You can actually place your hand on the electric
boiler while it operates at maximum capacity!