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That's great - fully understood. I'll leave it to do its job. Many thanks

Thanks for your replies. I've done my best with a photo but it's all a bit tight! You may be able to see the hot water primary feed coming off the back of the 3 way valve, then looping back then down into the extra V4043H valve before continuing down and left into the cylinder. I've tried...

Hi, I'm hoping someone can tell me what the 2 motorised valves are doing in my pumped heating/hot water system. The 3 way valve is not the original and is a V4073A which I understand controls both heating and hot water in a Y plan. However, there is also a second valve controlling hot water on...

Thanks Mottie - really useful practical advice. Cheers

Got it! Many thanks

Thanks for your reply Johntheo. You've suggested fitting a gate valve and an ABV. I'm not sure how the gate valve will help with the setting of the ABV. Could you help me out please? Thanks

Hi, I'll be fitting a Honeywell DU144 ABV to replace a corroded gate valve. Honeywell's instructions require the pump head and flow rate to calculate the ABV setting. I've found the pump head (2.0m) in the technical data of my Greenstar 24i sealed system but the flow rate is not listed. Is this...