Automate your Bosch Thermostat 2

Blueprints Exchange
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Automation especially for the Bosch Thermostat II (BTH-RA)

One of the big advantage of the Bosch TRV is that it’s possible to set the value of an external temperature sensor as current temperature – there is no need of the usual manual calibration. I was surprised that nobody published an automation for the sync of the external temperature sensor. So I tried to build up a blueprint on my own. That’s my first one btw. :nerd_face:
Please give it a try if you own a Bosch Thermostat II.

(Btw. I also tried to sync a window sensor with the window_open entity analogues to the external temperature sensor, but sadly the TRV will forget the target temperature after a few minutes and it keeps a low target temperature after closing the window. So I ended up in the typical solution of setting the TRV off/on depending on the window sensor)

Core Features

  • Switch the TRV on/off depending on a window sensor
  • Sync the value of the temperature sensor to the TRV’s internal remote_temperature entity (there’s no need to calibrate it manually via local_temperature_calibration)
  • Based on a weather entity and a winter temperature the TRV will be switched off to avoid heating in the summer

Notes

  • Maybe this blueprint works also for other TRVs. The required entity of the TRV: remote_temperature
  • The blueprint is currently only tested with z2m – maybe someone can verify it for ZHA.

References

ToDo

  • Add time based trigger for temp sync
  • Make window sensor optional
  • Add error handling if the remote_temperature entity is missing

Installation

Open your Home Assistant instance and show the blueprint import dialog with a specific blueprint pre-filled.

Sourcecode

2

A good blueprint but i think you should trigger that at least every 30min because if the temperature will not update every 30mins it will use the internal sensor again.

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Thanks for your reply. That’s a good idea, I will test a bit. Maybe that can explain why the TRV keeps heating even though the target temperature is already reached.

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Hey, I’ve been trying to implement your Blueprint but the Trace tells me that the “Template rendered invalid entity IDs” at the last step of the Automation

service: number.set_value
data:
  value: '{{ states(current_temperature) | float }}'
target:
  entity_id: '{{ remote_temperature_entity }}'
5

Actually it seems that your TRV don’t have the internal entity called “remote_temperature”. What kind of TRV did you setup as thermostat? Really a Bosch Thermostat 2?
But never the less I really need to implement some error handling.

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Yes they are Bosch Thermostat 2. Can’t figure out why I can’t call remote temp

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are you using via ZHA or Z2M? I don´t know if the entity is there in ZHA

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Any chance to use this Automation without the need for the window sensor?
We have a bathroom that has no windows and the automation needs a window sensor.
Or should I resort to rebuilding it? :slight_smile:

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I never thought about that. This is of course a valid use case. I’ll make the input optional.
But you there is an easy workaround, so you can use the blueprint now: Just create a template for a sensor for the non existing window and set it permanently to “off” to indicate it as closed window.

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10

Very ture. I didnt think of that simple solution :smiley: Thanks for the heads up :slight_smile:

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For that I just built a quick node red automation, that triggers all of my TRV Automations every 5 minutes. Works like a charm.
The external Temp is always up to date.

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@Mar1us Done. I added the time trigger and updated the blueprint.

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