>>508078627Nah man a modern air-to-water heat pump will still have a COP of at least 1.5 (probably more like 2) at -10C outside and a ground source heat pump (having a much more stable source temp) will have a COP of around 4-6 year round.
COP of electric heating is 1.
You will ALWAYS use more electric energy using resistive heating compared to heat pump heating.
That is disregarding the financial aspects of initial investment and running costs, price of gas and electricity, photovoltaic self-consumption, etc.