Do Any Thermostats work with OpenTherm in a Multi-Zone System?

[Rehan Saeed]

I was planning on a three zoned underfloor heating system using three Nest thermostats but discovered that Nest doesn't support OpenTherm in a multi-zoned system.

 

1. Do any thermostats support OpenTherm in this configuration?

2. I've read that I can enable OpenTherm on one zone but that it'll cause the boiler to set the temperature for all zones. Is that better than nothing? Is it worth it?

[JohnMo]

Not sure how you could unless the 3 zones had there own mixer and the opentherm controlled the mixer.  Or each zone is run at a completely different time without overlaps. The opentherm bit just modulates the boiler output.  I would try running as a single zone and balance down rates to manage temperature in areas