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I have a Honeywell Evohome system installed in my house working with my Vaillant Aqua Plus (VUI 280-7) in ON/OFF mode. I am thinking of adding the R8810 OpenTherm module to Evohome with the goal to further improve the comfort in my house. The issue I am facing is that my boiler does not currently ha...

I have a Vaillant Aqua Plus (VUI 280-7) boiler that has an analog interface (pins 7-8-9) for flame modulation, so it expects a DC voltage range. I would like to install a Honeywell Evohome system in my house that has an OpenTherm interface for flame modulation. The boiler is still in a good shape, s...