Gravity hot water temperature control

Terry D · 2003-10-29T16:34:16+00:00

I have an old Potterton boiler with gravity hot water and pumped heating.The system still works very well and seems reasonably efficient (£25 monthlyfor a 4 bed detached). However, during the colder months, I have far toomuch hot water at too high a temperature. Would it be possible to add athermostatically controlled valve to the return from the hot water cylinder(thus maintaining the vent on the flow pipe) in order to control the hotwater temperature. I have a 3-way motorised valve which I could use byblanking one of the inlets, and then controlling it from a cylinder stat.Would I also need a narrow bore by-pass.Terry D.