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stevo_com
Tonts
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.