Hello,
I currently own a heatpump from Stiebel Eltron LWZ 304 trend. Currently, I fully control it without ISG Web from Stiebel Eltron using FHEM and a serial connection to my Raspi.
As far as I can see, Home Assistant only supports this device with modbus and an ISG Web device from Stiebel which I do not want to buy.
FHEM, however has a smart module that can control the LWZ directly using the serial interface without the need for any additional vendor specific hardware:
https://wiki.fhem.de/wiki/Tecalor_THZ_Wärmepumpe
This heatpump is currently the only thing that makes me stay with FHEM, but in the future I would like to switch to HA, but I would like to integrate my heatpump the “serial” way. Any chance to do this with HA?