Sorry, I meant both resistive AND combustion (eg, "gas"). Now, obviously, natural gas is far cheaper than electric for heat in most of the US at least, but it's

Sorry, I meant both resistive AND combustion (eg, "gas"). Now, obviously, natural gas is far cheaper than electric for heat in most of the US at least, but it's all 'generated' heat, with all of the waste heat and CO2 emissions that entails.