Hi, I wonder if I can get some advice. I'm trying to find the way of convneting my 2 zone heating controlled by 2 nest thermostats via heatlink connected to viesmann vitodends 100 system boiler. Everything is working well so far, but I would like to knwo whether it is possible to use opentherm feature for 2 zone system. My boiler has got opentherm feature as well as heatlinks, but boiler ha sonly got one opentherm output and I got two heatlinks, so I don't knwo if this will even work? I got feedback from my friend who use this feature and their gas usage has dropped significanlty. May I have any advice on this please? Thanks