I've had too many problems with my boiler and leaking pipes, and during the last problem I found that my house was fine with just plugin 3Kw convection heaters in the rooms that needed heating. Could I just wallmount these myself and have them plugged into the normal wall socket? Or should I be getting special wiring done by an electrician? Worth getting more sophisticated heaters with timers on the thermostats that can be managed centrally? What about hot water? Immersion tank, or can I get an electric heater that will heat the supply to all hot taps and shower?