Rather than using gas to make electricity to heat water or run heat pumps to provide heating when electricity is 5x as expensive as gas ( so a heat pump needs to provide 5KW of heat for every 1KW of electricity used just to equal a good gas boiler at over 90% efficiency, when below 10deg C air source heat pump is <2x, and below 5deg C is about 1.5x ). There is also the big upfront cost of heat pump compared to gas boiler.
So to provide equivalent heat to a 24KW gas boiler on a cold winters day your heat pump would consume about 16KW ( or 64 amps from your domestic supply of 80 or 100 amps ). I have read that heat pumps are better for heating rooms than heating domestic hot water, so presumably you need an immersion heater for hot water ( need to heat hot water to over 60deg C to kill legionella infections ).
So what manufactures may be loathe to tell you is that heatpumps provide most heat when you need it the least - like solar panels.
Governments do not seem to have a plan B for when renewables fail to meet our requirements.......