Watts to Btu's conversion

See: British thermal unit - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/British_thermal_unit)

And

Fuel and Energy Conversion & Equivalence Chart (http://www.cogeneration.net/FuelAndEnergyConversionandEquivalence.htm)

Questions?

At 100% efficiency each watt emits 3.412 Btu's. Most heating systems are in the high ninety's as far as efficiency, but not always.