Hello
Many thanks for your reply.
If the Boiler is heating the Cylinder only will a reduced flow reduce the amount of heat going to the Cylinder, and will the Boiler be OK?
Tim
Recently had a new Worcester Greenstar 24RI installed in the loft area. The Boiler loop has been extended to the Loft area and the header tank moved to above the Boiler. 3 way valve and pump remain in the airing cupboard and its an open vented system.
This replaced my 20 year old Potterton...