I am starting this topic to have a single point to discuss the Östberg HERU FTX (energy recovery ventilation unit).
There is a custom component supporting the HERU available here: GitHub - toringer/home-assistant-heru: Östberg HERU energy recovery unit component for Home Assistant
It can easily be installed using HACS.
The firmware version of HERU has seen breaking changes, with no clear warning/information from Östberg before upgrading. So bear this in mind when upgrading.
The integration requires at least firmware 1.09i to be installed. The highest confirmed working version is 1.14. If you have installed a more recent version, and can confirm that it works with the HERU integration, please comment below.
I am using your integration as of HERU version v1.10, now with with latest upgrade v1.14, and all seems to be functional correct.
Hi
I just started running the integration with the 1.14 version of firmware. It seems to be working as expected.
But I don’t understand the meaning of a temperature measurement, Heat recovery temperature. Does anyone know what that value represents?
I am also using the integration (v.1.0.6) and running the latest firmware (1.14, July 2024) on a Heru 160s. It is working great except for “Current heat/cold recovery power” which is always stuck at 99.9999999885%. I have created an issue over on github.
@magicus What is needed to get this to work? Some sort of WiFi dongel or connect thing on the Heru?
Will be swapping my 40+ year old FTX to a Heru or Systemair in the coming months.
Was using Airiana on a Rpi2 with a rs232-hat in my old house. Can recommend that for everyone with a Systemair.
For my setup, I have an ethernet cable connecting to the Heru. However, since this is installed in my attic and I did not want to put wiring all way up, I bought a multi-function WiFi extender which has an ethernet port. This links up over WiFi with my router.
This works, but unfortunately it is a bit shaky. Apparently the range extender I bought was not the best quality, and it needs to be restarted every now and then, which is a bit tricky since it is in the attic. So a recommendation is to do your research and make sure you buy a high-quality connection. Or put ethernet all the way, it’s probably the best.
Ok so the Heru actually has ethernet our of the box? Its not an optional device you buy extra?
WiFi extenders usually sucks 
Mine had it; I think it is standard, but I’d recommend you to double-check that.
To my knowledge, all the new “EC-Y2” Heru models have an ethernet port. They also have a RS-485 port you can hook up with modbus.
Integration up and running on a newly installed heru-unit, connected via ethernet. Very nice integration in HA.
It would be nice to se power consumption of the heater. Now its presented as percent. Is there any way to change that?
I personally solved this by adding a simple power-measuring plug that feeds power to the unit. The power consumption pattern of the Heru unit is very peculiar. For normal operation, with sensor.ftx_current_heat_cold_recovery_power at 100% and sensor.ftx_current_heating_power at 0%, it stays steady at 133 W.
But if I enable the heater, it starts consuming more. But this consumtion is not steady, but pulsed like on 1 kW for a second, then off for four seconds, etc, and the more power requested, the longer the pulses stay on. This confuses a lot of power-measuring.
I guess I could do some more precise measurements and it might help create a mapping of the values reported by the unit to actual wattage numbers. But then again, it will ever only remain an approximation.
Hi there, do you mind to share a power consumption measurement device, which brand and type do you use? Meanwhile I officially asked Heru to expose it via modbus. Will see what they will answer for such a request…
Sure, it is a AEON Labs ZW075, Z-Wave JS Config DB Browser. I picked that one since I have a well-established ZWave network, and it is generally much more stable than the Zigbee mesh, and I did not want to have to go up to the attic to restart the plug.
But I believe any power measuring plug would do. For most of the rest of the devices I monitor, I use a cheap Tuya TS011F clone, available for < 100 SEK from chinese web shops. They usually work just fine.
Also, IKEA seems to have finally released Inspelning. Since all other Ikea Zigbee devices have been excellent, that’d probably be my choice if I were to buy something now.