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very interesting. thanks again for your time.

Thanks for your comment. This makes sense, I understand why you would go for the third option "thermost." if it can't modulate down that low. I have a small ecotec plus 824 combi, which apparently has a modulation range of 1:6. = 16%.. Another site states an output of 6.7 to 19kW. (I can't...

I think I may have got to the bottom of this, and for anyone else searching, I hope the explanation below helps. (from the settings on the unit under room temp control) None= Flow temp is controlled by the EXTETERNAL temperature and the heat curve set. It ignores the internal room temp...

Hello, Based on the conversation here, I'm hopping someone might be able to help with a query about "room temp control" setting in the installer level>system configuration>HEATING 1>Room temp control of the VRC 470 ? the manual ( section 8.4.10) refers to 3 modes: "None", "Thermostatic...