Opentherm for 2 zone heating and Nest thermostats control

Kamyk8450 · 22 Dec 2023 at 10:53

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

Mickie · 23 Dec 2023 at 20:58

Ive not found a solution to this problem, might be a good idea to talk to viesmann or nest about it.

Mickie · 23 Dec 2023 at 21:02

What about getting a weather comp thermostat and just wiring up the two zones as normal.

Kamyk8450 · 28 Dec 2023 at 09:44

This solution will not work. But thanks anyway. I wonder if there's any system boiler on the market which will cope with two zones?