Hello L-Lass Perhaps you have seen my other post from today. The house I bought 13 years ago, had a "central heating" i.e. a wood burner attached to radiators and a tank for the hot water. Last year I changed the system and put 10 m2 of solar panels, a 1000 Liter tank, plus the woodburner added to this tank with its radiators. This works fine. Hot water for all the village in summer and in winter, my own wood is helped by the sun .. The French plumbers do like the pompe a air systems, but they are not the solution to help our planet. You have to use electricity to keep the system working. They tell you, that for an input of 1Watt, you receive 3 to four Watt. That only works in Summer. when there is frost outside, you can forget it. If you are interested, I would show you the system Herbert, living in dept 24, Riberac