i dont mind the energy spent on a day to day basis because i already have a 5.5kwh solar off grid array. i generate around 30 kwh during a good summer month and a fraction during winters but it gets offset from the grid also.

the grand scheme as i wrote above does not seem cost effective only because of the heat pump. if it were cheaper, i would definitely buy it because radiators/solar water/solar panels are low/no maintenance while heat pump does have it.