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Thanks very much for all the info. I think contacting Vaillant is a good idea and I'm going to do that. Thanks again for everybody's input.

Thanks for all the replies. So looking at the info I have now got. Appreciating that although the vrt50/2 is maybe not the best ebus control, it will modulate the boiler better than flow and return water temperature and with the vrt50/2 connected it will override the flow and return water...

thermostat WOULDN'T get the boiler to modulate Correcting a typo error from before.

Please excuse my ignorance in all this! At the moment the system has a timer for the hot water and the central heating which I'm happy with. The hot water is heated for 1.5 hrs in the morning and the central heating for 1 hour in the morning and 6 hrs in the evening. What I want from the...

So I can't simply disconnect my existing thermostat, run a new cable from the ebus terminals at the boiler direct to the ebus thermostat.

Hi, I recently have had a new vaillant boiler ecotec plus 415 installed. It's a conventional system with single zone heating and a hot water storage tank. This is the first boiler I've owned with modulation capability. At the moment the room thermostat is a simple on or off type. The boiler does...