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Thanks I have a 4 speed Grundfos pump that seems to be working OK (change of note when speed is increased etc) I have also restricted the upstairs rads on the outlet and set the thermostatic valves to the highest setting on the downstairs rads with the outlet valves fully open. - But still...

I'm sure they 'should' do everything they need to do, but it can't be right that our downstairs radiators don't even start to get warm within 2 hours of the system coming on. No problem with water heat, and the upstairs radiators start to warm relatively quickly but downstairs is like a fridge...

Thanks, assume 'A' is open and 'B' closed? Is it OK to put them both in the open position? Will this speed up delivery of hot water to the radiators? Or must one of the valves take precedence over the other? If I switch the water heating to 'B' and the central heating to 'A' does that give...

Sorry I cannot help you with your question; but I also have two of the subject valves on my system, and whilst my system works (after a fashion) it is not very efficient. For instance when I advance the time switch if it is cold, the downstairs radiators take forever to warm up - like 3 hours or...