Not sure which pipe the pump is on, but I do know its in the loft, just above the expansion pipe, located just under the 2 values for HW or CH.
So I guess its on the pipe just before the Hot Water Tank, and before the water is pumped around the CH.
Sorry if that doenst help.
Im new here so please go easy on me. I have an Open vented system but without the header tank for the HW.
Boiler is a Glowworm 45-60
Pump is a Myson SD53
Over the last few days I have had a leak from the expansion tank, after draining the system enough to remove the water from the...