I have a solar PV system and an Immersun which diverts electricity I would otherwise export to the grid into my hot water cylinder immersion heater. The immersion only heats the top half of the tank, and to fix this I thought about a tee off the hot water outlet back into the bottom of the tank. (There is little room to put another tee into the cold water in feed unfortunately) this would include a small pump driven off the immersion circuit, with it's own override power switch. Any thoughts? What sort of cost would this be if feasible? Thanks Hugh
