Anyone every use one, I have split off one of my upstaris bedrooms onto its own heating zone. I have a boiler and all of the rooms have there own thermostats. This room is very far from the boiler 3 floors away and on the other side of the house. Old house 1837 so runnig a wire up could be next to imposs. My electrician want no part of it, and running one outside is an option but looks like poo. So has anyone used one of these?