Help Needed: Controlling and Modulating Boiler with Sonoff TRVs in Home Assistant #2357
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There are also some ideas from users on the Discord channel, maybe looking at those too will give you some pointers. |
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You only need to control the boiler selflowtemp (if there is no thermostat in the system). Then the boiler will modulate, start, stop automatic on the heat demand to reach this flowtemp. |
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Thank you for your reply, I don't have the entity "selflowtemp" wath kind of entities should it be? climate? sensor? switch? Here is the list of entities of my boiler ems-esp |
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selflowtemp is the name of the EMS-ESP entity. You're looking at Home Assistant (another product). If you want to see the mapping between EMS entities and what they are called in HA look at https://docs.emsesp.org/All-Devices/#all-devices-and-entities |
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Just as an FYI - if there is a thermostat (as there often is), a similar method is to control the boiler/heatpump maxflowtemp. You simply setup a flat heatcurve in the boiler. So for example, if you know you'll never need to exceed 65°C, then you set both "ends" of the OAT compensated heat curve to 65, resulting in a flat "curve" that always outputs 65°C as desiredFlowTemp. Then you limit this using the maxFlowTemp parameter to your desired flow temperatur, and thus, this becomes your "selflowtemp" regardless of how many thermostats are present. So it's a pretty universal way to do it. |
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Hello,
I’m new to Home Assistant and recently managed to install EMS-ESP on my condensing boiler (Junkers Cerapur). I’ve successfully configured it to send data to Home Assistant via MQTT, which is working well.
Now, my challenge is figuring out how to make my Sonoff TRV valves control the boiler. Specifically, I want the boiler to:
Start and modulate its output when one of the TRVs requests heating.
Shut down when all the TRVs have reached their target temperature.
Here’s my current setup:
Sonoff TRVs for individual room control.
Junkers Cerapur boiler connected via a BBQKees EMS-ESP module.
A Netatmo relay on the dry contact for basic on-off control (no modulation).
Netatmo thermostat and TRVs (currently integrated but I'd like to move away from Netatmo entirely).
I still have my old Junkers thermostat (now disconnected), but I don’t want the boiler to rely on a central thermostat—it should be controlled dynamically based on the TRVs
I’d greatly appreciate any guidance, suggestions, or examples on how to achieve this setup. Thank you in advance for your support, and I’m ready to take any steps or try out recommended solutions to make this work!
Guillaume
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