Replaced existing 230 V AC immersion heater. The idea being to use the wind turbine to drive a 48v 1KW immersion heater to constantly heat up the hot water cylinder. Then with the central heater turned on (but the burner turned off) have the CG pumps act as a reverse heater exchanger heating the burner loop and rad loop from the hot water cylinder. Normally, teh burner would be active heating the water in the hot water tank loop (and radiators if the valve is open).