Technical Specifications

General

• Temperature range: -10°C to +40°C (operational)
• Dimensions: 92 x 47.5 x 26.5 mm
• Enclosure: Not waterproof. Install in dry location only
• Current hardware: V4 with ESP32-C6

Power

• USB-C: 5V ⎓ 1A minimum
• PoE: 802.3af (V2/V3/V4 built-in)

Network

• WiFi: IEEE 802.11 b/g/n (2.4 GHz), WPA2 or WPA3
• Ethernet: 10/100 Mbps (V2/V3/V4 with built-in PoE)
• Thread (V4): Via the built-in IEEE 802.15.4 radio, with the Thread firmware and a Thread border router
• Data transfer: Water one update per liter. Energy every second on DSMR 5 meters, every 10 seconds on DSMR 4, over Thread every 5 seconds

Water Sensor

• Cable length: 3 meters (maximum recommended)
• Connection type:
  • V3/V4: Detachable connector plug
  • V1/V2: Screw terminal (3 wires)
• Compatibility: Analog water meters with rotating metal 1-liter indicator
• Digital water support: Belgian DSMR/MBus water data through the P1 telegram, using DSMR Water Consumed (firmware V1 1.13, V2 1.14, V3 1.13, V4 1.11 or newer)

⚠️ Do not extend the sensor cable beyond 3 meters. Voltage drop causes unreliable readings. Use Ethernet for distance instead.

P1 Energy Meter

• Cable: RJ12, 2 meters (included)
• Compatibility: DSMR 4, DSMR 5 and ESMR 5. Older DSMR meters need custom ESPHome settings
• MBus IDs: gas_mbus_id for gas, water_mbus_id default 2 for Belgian digital water meters

Software

• Firmware: Open source ESPHome
• Integration: Native Home Assistant support
• Updates: OTA (Over-The-Air) supported