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Thanks again, that all makes sense.

Thanks DP that’s really helpful, the pump is not currently wired to the boiler so I will take a look at that. I’ve adjusted the bypass valve and that’s reduced the return temp to the boiler. I’ve also noticed that when the boiler stat is showing 78degrees I’m only getting 63 degrees at the...

Thanks, it runs pretty quiet but I will take a look at that too.

Ok thanks, just wondered if the bypass being open all of the time would make the boiler less efficient as it might stop it condensing?

Thanks for your help. So would 2 metres equate to the number 2 setting on the bypass valve?

Thank you for the link that’s really useful and I will give that a go. Would I be right in thinking that with the valve fully open I’m loosing some heat to the rads and also that the water going back to the boiler via the valve will make it too hot for the boiler to condense?

Hi, wonder if anyone can help with the following issue. I have a Worcester Bosch CDI 30 Greenstar boiler with a DAB 40-70/130 pump, 2 times 2 port valves one ch, one dhw. When the room stat reaches temperature the boiler temperature increases rapidly and can display U9 value which I believe is...