HA integration heating system flat (2)

Hardware
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1

Hi there,

I’m looking for recommendations on integrating a Raspberry Pi as a controller for two gas heaters in separate apartments.

  • Buderus Logamax u012 t60 (on/off only, no OpenTherm)

  • BAX Nuvola Duo-Tech + 24GA 24kW (has OpenTherm support)

I already have a Tesla Smart Hub and Tesla TV100 valves, so I have Zigbee communication with Home Assistant.

Here are some options I’m considering:

For the Buderus:

  • Sonoff DUALR3 2-Gang Wi-Fi Smart Switch

For the BAX:

This is a bit trickier since it uses OpenTherm. I need a communication module to integrate OpenTherm between the heater and the Raspberry Pi running Home Assistant. Here are a few possibilities:

  • Modbus OpenTherm Gateway
  • Smart thermostats (but OpenTherm gateway control might not be 100%)
  • ESPHome or Arduino DIY solution
  • Virtual thermostat in Home Assistant
    Any advice or suggestions would be greatly appreciated!
2

For the Buderus, check what type of switch is required. Some boilers want 240VAC, others need a “no volt” switch. If your Buderus uses the latter, you’ll want to modify the Sonoff so that it isn’t feeding mains voltage to the boiler (could release a lot of smoke and be an expensive repair).

As for the BAX, I’m biased and would go for ESPHome with the OpenTherm component. I’ve been running my boiler (a Viessmann) for a year now using the diyless shield and the development version of the OpenTherm component that is now in ESPHome. The PID Climate component does all the thermostat stuff, and is running quite well.