I compiled all the research that has happened in this thread into an external component for ESPHome. It's working well on my EvoHeat 270 HPHWS! GitHub - sjtrny/esphome-hw211: ESPHome component for HW211 heat pump controllers · GitHub
I compiled all the research that has happened in this thread into an external component for ESPHome. It's working well on my EvoHeat 270 HPHWS! GitHub - sjtrny/esphome-hw211: ESPHome component for HW211 heat pump controllers · GitHub