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Finally managed to check and confirm that valves were the wrong way round. The Drayton valves markings were underneath the valve with A B notation at appropriate end, however this was not evident due to the way the valves were installed. The actuator has a manual lever which is misleading as...

Thanks for your replies. All pipework is very secure. Pump does not have speed control according to Baxi. I believe valves were installed right way round as I am sure I checked this at installation, but a quick observation last night did not make it obvious which end was A and B. I...

I am not sure. This is not something that I have looked at as the pump in within the Boiler enclosure. I will check later today and report back. thanks

I have recently had my central heating/HW system upgraded. I have a Baxi Megaflow system HE boiler 2 x 2 port drayton ZA5 valves, plus a Boiler Buddy on the return to catch any bits in the old pipe system. Boiler and valves are located in the loft. HW cylinder were also replaced along with...

I have a single pipe heating system with gravity fed hot water. I want to upgrade the boiler and system to be fully pumped. I also want to move the boiler to the loft and a header tank is out of the question due to head height. Can anyone recommend a boiler to suit. 4 bedroom single...