Our experience - £160 per month electricity DD currently. New build. Double glazed. Air source heat-pump, underfloor heating on ground floor, rads first floor, plus towel rails in bathrooms. Thermostats in every room. All electric. It has taken over 12 months to become familiar with room settings required, but finally getting the hang of it. Main gripe is that the system is noisy! The main manifold is situated centrally understairs and the pump is audible when heating comes on. The house has minimal glazing on the north side - only 3 small windows - and the heat gain from numerous large windows on the south side on a sunny day is fantastic. Sunshine on a cold winter day will raise the room temperatures to 22 degrees. Insulation is as required by the regs, but I believe the system would work even better if additional insulation was added in the roof space. I can't see how an efficient heat pump system could be installed in an existing property without major alterations. However there has been very little discussion about replacing gas combi boilers with electric ones, which appear to be increasingly available.
That's interesting. My situation
I had a new condensing gas boiler installed 2 years ago, a Viessmann (German made) best dam boiler I have ever had (I'm 75 I've had a few)
We have a 3 bed detached house built 1983. Cav wall insulation, double glazing, loft insulation but according to latest advice probably not enough !. We are retired, home a lot, obviously, and our heating is on from 6a.m - 10 pm. every day. Thermostat set at 21 from 6 a.m until we get 'moving' say. . . 9 am. Then set at 20 degrees until sunset when it goes back up to 21. These 'rules' not set in stone, if we are cold, heating gets turned up. Currently my Direct Debit is £150.00 a month. I 'upped' this recently from £100.00, because I knew I would no doubt fall behind.
This is currently sufficient for Gas and Electric but come April I am probably going to have to raise it again. N;B I am with Octopus Energy, I can freely adjust my DD whenever I want. (I doubt I would be allowed to drop it below what Octopus deem sufficient) We are fortunate that we can afford the energy, however I don't just 'let it rip' I don't like it (£80.00) a month covered us last year !. We have family with children who cannot afford it and we regularly help them with their bills. What a sad state of affairs, I believe every human has a right to a roof over their head, food in their belly's and the ability to keep warm. I know . . . I know, I'm not living in the real world.