Franglais:
I don`t like being controversial, but have you all considered heat pumps?Compared with merely using electricity to heat a wire, they are up to 300% efficient*. They are not always a simple switch into existing systems, but can be worth the capital investment.
If 100% efficiency is from heating an element, a heat pump can “shift” up to 3 times as much energy.
(like to see this done in imperial measures too!)
Only if you believe in the physics of more energy out than you put in and that it can miraculously turn 20 degrees C air temp into 50-60 degrees C water temp for nothing.Let alone 0 degrees air temp.Also costs around 10-20k installation for the privilege.
The return on solar panels is better than heat pumps and they are bad enough.
Have you taken your own advice by ditching the gas boiler for a heat pump.Bearing in mind that France is obviously turning it’s back on dangerous expensive nuclear and nicking our gas instead according to UK gas export figures.