An ESP8266 / ESP32-S3 PCB that plugs directly into Panasonic Aquarea heat pumps, decodes the serial protocol, and broadcasts all sensor data over Wi-Fi via MQTT — in real time.
Panasonic Aquarea units expose a CN-CNT serial port. HeishaMon is a custom PCB that taps into it, reverses the proprietary protocol, and streams every register to your home automation stack — without cloud, without subscription.
Every sensor pushed to your broker the moment it changes. Water temps, compressor state, flow rate — all live.
Native integration with full entity auto-discovery. Climate control, switches, and sensors appear automatically.
Long-term logging to time-series storage. Plot COP curves, efficiency trends, and heating cycles over months.
Built-in scripting runtime reacts to sensor thresholds. Automate modes, setpoints, and external triggers.
Onboard UI for live status, configuration and OTA firmware updates — no USB cable required.
Expand with the optional board to query Panasonic accessories: solar controllers, pool heating, and more.
No modifications to the heat pump. No cloud account. No subscription.
Plug HeishaMon into the CN-CNT service port on your Panasonic Aquarea indoor unit. It's a passive tap — no electrical modification and no warranty issues.
On first boot HeishaMon broadcasts its own hotspot. Connect with your phone, enter your Wi-Fi credentials and MQTT broker address, and you're done in under two minutes.
Dozens of MQTT topics appear immediately — temperatures, modes, error codes, energy counters — fully decoded from the proprietary Aquarea serial protocol.
Connect Home Assistant, Node-RED, Grafana, or any MQTT-aware tool. The HA integration ships with complete entity auto-discovery out of the box.
Sample MQTT output from a live HeishaMon unit.
# temperature sensors Heatpump_State 1 Leaving_Water_Temp 42.0 Outside_Temp 7.5 Room_Thermostat_Temp 20.2 DHW_Temp 52.0 Inlet_Water_Temp 38.4 # energy & compressor Compressor_Freq 38 Heat_Power_Production 6.2 Heat_Power_Consumption 1.8 Pump_Flow 14.3 # control — writable topics Set_Heating_Water_Temp <-- set 45 Operating_Mode_State <-- set 0 Force_DHW <-- set 1
Hardware ships from the Netherlands. Firmware is open-source, community-maintained, and actively developed.