sonnen battery controller based on ESP8266/ESP32 to drive a 3.3kW heater (Heißwasserspeicher-Einbauheizung) and integrates with the local hot water system.
esp8266 esp32 switch smart boiler heater lpb smartswitch sonnen switc hotwater rvd250 rvd251 lpb-protocoll siemens-rvd austria-email
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Updated
Nov 14, 2025 - C++