• Damn those laws of physics, surely there must be some device somewhere to output more heat than the energy put in.

    Cheers all, I hadn't seen the corner valves before, they certainly do seem to be an option to neaten up TRVs. Trouble is that smart TRVs and corner valves for 7 radiators is probably getting up to £400 or something and it seems pretty unclear whether ongoing costs would be any cheaper than just running an electric heater.

    Going to have to ponder this.

  • You could start with just putting normal TRVs on in the least used rooms and keep them at a low temperature.

  • That's only one room though (or all rooms bar one during the day) and even that room gets used for drying washing on a very regular basis.

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