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Interesting thanks! So the pump speed is set to auto which nearly always defaults to 15% unless the boiler is just starting up and the return is really cold (and so the full 30Kwh). At which point I have seen it go as high as 75%. What are the downsides of making the bypass harder to trigger...

Yes it is still weird, no ideas why it might be bypassing a little bit? It could also be a measurement error accounting for a few degrees? If you screw in the bypass valve, making it require a higher pressure to trigger (not that i'm going to, just out of interest), then why do you need to set...

So the difference between the flow temp with CH and UF is due to the weather compensation and each being set on a different curve. Forcing the motorized valve open has made a big difference though! Boiler is no longer immediately dropping to min modulation and is firing fully meaning I can feel...

Yes a system boiler with an internal pump. Not sure if the CH zone valve is opening fully....is there an easy way to test this? It is def letting some water through and i don't seem to manually be able to open it any further when it is "on". UFH manifold flow temp is set to a max of 50 (but we...

Thanks for your reply. In order of flow, boiler return and measured return I get: CH only: 72, 53, 30 UF only: 63, 43, 41 CH & UF: 67, 47, 44 So as you can see there is a big difference between measured return and boiler return on CH only. This morning it was even wider...more like 70,65,28...

Hi, I have an Ecotec plus 630 system boiler which was installed a few months ago, wit a hot water tank and 2 zones (one controlling UFH and the other about 15 rads). Everything was working fine until a few days ago. As long as both the UFH and the CH zone are calling for heat then the system...