Re Open circuits, yes they have no control valves and are open to allow the pumps to circulate the water to cool off when there is no heat being called for
Regards
John
Is there any one out there who could please advise me as to how long the average time is for the pumps to stop after the boiler is shut down.
I have an AGA 480AG running all of the heating in our house. All rooms have their own remote transmitters etc to their own receiver and valve.
They all...