Thank you Stem. Just to say that I installed Salus over weekend using 24v and two separate cables as you advised. All working fine so far and long may it continue!
So should be like diagram attached? I understand that the Salus can be volt free or 240v. I appreciate your answer and will probably use the 24V as you explained but out of interest could the lilac 240v RT connection be used?
Thank you Stem
How do I wire a Salus RT510RF thermostat receiver to Vaillant Ecotech Plus 837 combi boiler? Live and Neutral are fairly obvious but what about the COM and NO from the Salus to which connector on boiler circuit board?
Thank you for any help.