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Gas boilers can by 95% efficient turning gas directly into heat energy.
Electricity generation is about 55% efficient at turning gas into electric energy.
So in a situation where you get 2 times or more heat out per kW you put in then you're lowering your carbon footprint even when electricity is created using gas.
2 to 4 times is not too difficult so
There's also the pretty big issue that the more methane is transported, the more leaks we have. As methane is 40× more potent than CO2 as a greenhouse gas every property we take off the gas network is a step towards reducing the need for that infrastructure.
Personally I can't fit an air source heat pump in my flat. It would be incredibly noisy and would probably require radiators to be refitted and taken up more space.
When my gas boiler goes I'll look at the cost of the standing price of a gas connection, annual servicing, and kW cost of gas. Then look at what a standard electric boiler costs.
It won't have the 2 to 4 times saving on kW cost a heat pump would have but it probably will come out similarly on cost. It will have a lower install cost. And it will reduce methane emissions.
If we haven't moved far enough to renewable energy by then my carbon footprint might actually go up. But the methane reduction will more than make up for that.