I think the calculations go something like this (in Europe): Gas costs 12c per kWh Electricity 36c per kWh Heat pump generate something like 2.5x to 4.5x of

I think the calculations go something like this (in Europe): Gas costs 12c per kWh Electricity 36c per kWh Heat pump generate something like 2.5x to 4.5x of heat per kWh spend. Alas they can be cheaper already.