Nest Thermostat (with Open Therm) on Worcester Bosch

[SWA2]

Sorry you've been let down by your builders. I haven't yet implemented my planned thermostat set-up as we're not there yet in the project, but after multiple emails back and forth with Worcester Bosch's technical support people (who are very responsive and helpful) my plan is to do what I outlined above: use the 'EasyControl Adapter' so I can use my existing EasyControl Thermostat to control my legacy radiators, though it becomes just on/off (lose weather comp/load balancing or the ability for the controller to smartly regulate the CH flow temperature) when it calls for heat, but I can still use the EasyControl with the Bosch smart TRVs to control specific rads, set schedules, and control remotely; and a Nest for the UFH zone. So basically I will have two separate thermostats/controls for my two zones, and will lose some Worcester-Bosch energy saving features (weather and load compensation to regulate CH water temp), but otherwise it should work....

If your question is about how to set up multiple zones, I cannot answer as my heating engineer is doing it, but for me it's not via the app(s), but rather two separate on/off controls attached to the boiler that can each call for heat for their respective zones. For your situation it sounds like you will need a separate Nest thermostat for your UFH zone, but presumably you can control both zones with the same Nest app.

As for UFH brand, we are using polypipe, but that's only because that's the brand our builders use/recommend and we trust them (we've used them before and they were great for our previous loft extension project and so far for our current rear extension).

 

[gazm2k5]

Sorry you've been let down by your builders. I haven't yet implemented my planned thermostat set-up as we're not there yet in the project, but after multiple emails back and forth with Worcester Bosch's technical support people (who are very responsive and helpful) my plan is to do what I outlined above: use the 'EasyControl Adapter' so I can use my existing EasyControl Thermostat to control my legacy radiators, though it becomes just on/off (lose weather comp/load balancing or the ability for the controller to smartly regulate the CH flow temperature) when it calls for heat, but I can still use the EasyControl with the Bosch smart TRVs to control specific rads, set schedules, and control remotely; and a Nest for the UFH zone. So basically I will have two separate thermostats/controls for my two zones, and will lose some Worcester-Bosch energy saving features (weather and load compensation to regulate CH water temp), but otherwise it should work....

If your question is about how to set up multiple zones, I cannot answer as my heating engineer is doing it, but for me it's not via the app(s), but rather two separate on/off controls attached to the boiler that can each call for heat for their respective zones. For your situation it sounds like you will need a separate Nest thermostat for your UFH zone, but presumably you can control both zones with the same Nest app.

As for UFH brand, we are using polypipe, but that's only because that's the brand our builders use/recommend and we trust them (we've used them before and they were great for our previous loft extension project and so far for our current rear extension).

Thanks for sharing your set up.

I just moved in to a new build with multi zone/valve set up; one thermostat for upstairs heating and another for downstairs. It's a combi boiler (WB Greenstar CDi Compact ErP) so hot water is on demand.

I was wanting to install a Tado for modulation, as it has the EMS bus wiring. However it seems your conclusion is that you can't do EMS wiring for multi zone set ups, is that right?

 

[gr1nch]

I've just started looking into adding OpenTherm modulating control to our boiler and thermostats too.

Our boiler is also a Worcester-Bosch (Greenstar 38CDi) powering radiators (normal and Thermaskirt) and underfloor heating. We use the wireless Drayton Wiser system (WiFi boiler controller, ZigBee TRVs and mobile room thermostats all communicating over its own ZigBee network) for all our radiators, including the Thermoskirts, which we treated as UFH and set up a manifold for them. For the water UFH we use smart (WiFi) Tuya-based thermostats whuch I flashed the WiFi card with WThermostatBeca firmware. Same with the electricial UFH upstairs in the bathrooms. Downstairs the UFH also has a single smart multi-switch box (Sonoff 4Chan) also controlling the zones (Polyfloor valves), which I put in place whilst I was waiting for the thermostats to arrive from China - useful to have secondary remote control.

All of this works with Home Assistant and we've full manual, remote and automation control.

The only thing missing is modulation control.

I wonder if the Wiser HeatHub controller does this by wire anyway for the radiators, does anyone know?