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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

The 3 Way valve is a Honeywell V4073A1039

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...