heat pump is a different animal as a well set up heat pump will give you similar costs on a 3-1 ratios
and yes gas is only 80% efficient but i had allowed for that as you get between 3 to 4.5 units off gas for a unit off electric depending on tariff
and yes gas is only 80% efficient but i had allowed for that as you get between 3 to 4.5 units off gas for a unit off electric depending on tariff