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WaterP1MeterKit V3

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Measure your real-time energy and/or water usage in Home Assistant

The WaterP1MeterKit V3 with built-in WiFi, Ethernet and PoE is the most flexible solution to date. Thanks to the detachable water sensor, you can choose whether to read out exclusively your energy meter, exclusively your water meter, or both. Additionally, the V3 offers an extra expansion port to which you can optionally connect a water leak sensor or door sensor. This gives you real-time insight into your consumption and more – fully integrated in Home Assistant.

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🏠 Home Assistant Compatible ⚡ Built on ESPHome
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Home

Discover the WaterP1MeterKit: A meticulously handcrafted Dutch creation, fully developed and designed to meet your needs.

Specifically designed for Home Assistant & ESPHome: The Water Meter Kit is specially designed to seamlessly integrate with Home Assistant & ESPHome.

Maximum flexibility: Measure energy, water, or both

The V3 gives you the choice: use exclusively the detachable water sensor for water consumption, only the P1 connection for energy consumption, or combine both for total insight. The separate water sensor with 3-meter cable offers maximum installation flexibility.

Shower
Toilet
Washing Machine
Dishwasher
Faucet
Bath
Garden Irrigation
Boiler
Swimming Pool
Kitchen Faucet
Bathroom Faucet
Garden Hose

Home Assistant

Make your DSMR meter even smarter and more insightful.

Upgrade your smart home with the P1MeterKit. Get a complete digital overview of both your electricity and gas consumption by reading your DSMR meter with our kit. Monitor precisely how much electricity and gas you consume during daily activities, such as running the washing machine, dryer, using lighting, the heat pump, and more.

Washing Machine
Dryer
Lighting
Heat Pump
Cooktop
Electric Kettle
Bike Charger
Electric Heating Boiler
Aquarium
Electric Car
Computer
Fan

Home Assistant

DSMR Reader

Installation examples — Easy to mount in under 1 minute

Below you'll find 3 example installation videos for popular water meter types. Our universal holder works with many more brands — see the compatible water meters list below for a complete overview.

Type 1 — Itron / Actaris / Schlumberger
Type 2 — Sensus
Type 3 — Elster / Honeywell

Compatible water meters

Our universal holder fits most European analog water meters. Below you’ll find the most common types per brand.

Not sure if your water meter is compatible?
Send us a photo or chat live (7 days/week) on Discord.
Send photo Discord
Sensus
Itron
Elster Kiwa
Schlumberger
Honeywell
Actaris
Diehl
Zenner ETDK ZR
Zenner ETWD
Zenner ZR
DH Metering
Elster
Hidroconta
Maddalena Plus C
Maddalena MVM

Different water meter brand?

Our sensor detects the metal rotating disc in analog water meters. This small metal disc (often silver-colored) rotates when water flows through. The sensor registers each rotation via magnetic detection = 1 liter of water. ⚠️ No rotating metal part? Then our sensor won't work.

Not sure if your water meter is compatible? Send us a photo!

Send a photo Discord

Compatible energy meters

Compatible with DSMR 2.x, 3, 4 or 5 energy meters with a P1 port. Check if your meter has a P1 (RJ12) — with P1 you’re good.

Questions about your P1/DSMR smart meter?
Send us a photo or chat live (7 days/week) on Discord.
Send photo Discord
Wat zit er in de doos - WaterP1MeterKit V3

What’s in the V3 box?

  • WaterP1MeterKit V3 main unit with WiFi, Ethernet and PoE support
  • Separate water sensor with 3‑meter cable
  • Universal holder for water meter (fits most European meters)
  • RJ12 cable (2 m) for DSMR energy meter
  • Quick Start Guide with installation instructions

Optional accessories

  • USB‑C cable (3 m) & Power Adapter: EU or Universal (US/AU/UK)
  • Water leak sensor or door sensor for the expansion port

V3 advantages

  • Flexible setup: separate 3‑meter water sensor — place exactly where needed
  • Measure energy, water or both simultaneously
  • Switch between WiFi and Ethernet in software; PoE supported

V3: Even more possibilities and flexibility in Home Assistant

The WaterP1MeterKit V3 introduces groundbreaking flexibility for your smart home setup. Unlike previous versions, you can now choose exactly what you need: install only the energy meter function, use exclusively the water meter function, or combine both for complete insight. The 3-meter cable of the detachable water sensor enables installation in the most challenging situations - even when your water meter and meter cabinet are far apart. Additionally, the V3 is the first to offer an expansion port for an extra sensor like water leak detection or a door contact, elevating your monitoring system to the next level.

Quote author 02
"The V3 is a game-changer! The detachable water sensor gave me the flexibility to monitor only my water meter without hassle with the P1 port. Later I could easily expand to energy monitoring. The optional water leak sensor has already saved me once from water damage. This modular approach is brilliant – exactly what I needed for my setup!"
Home Assistant App

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Customer Review: WaterP1MeterKit V3

Based on 17 reviews

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Frequently Asked Questions

What exactly is the WaterP1MeterKit V3?

The WaterP1MeterKit V3 is our most flexible solution to date. Thanks to the detachable water sensor you can choose to read only your energy meter, only your water meter, or both. The V3 supports WiFi, Ethernet with PoE and offers an extra expansion port for a water leak sensor or door sensor. You can switch between WiFi and Ethernet firmware at any time without hardware changes.

Can I monitor both my water and energy usage in real time with the V3?

Absolutely! The V3 provides real‑time insight into both your water and energy consumption. Uniquely, you can choose: use only the detachable water sensor for water, only the P1 connection for energy, or combine both for a complete picture. Everything appears in Home Assistant in real time.

Is the WaterP1MeterKit compatible with all smart meters and water meters?

The WaterP1MeterKit is designed to fit most common analog water meters and smart meters. For a full list of compatible meters, please check our website.

How do I install the WaterP1MeterKit V3?

The V3 offers maximum flexibility: mount the detachable water sensor (if desired) with the 3‑meter cable to your water meter using the universal holder. Optionally connect the RJ12 cable to your energy meter’s P1 port. Connect the V3 via WiFi, Ethernet or PoE. Home Assistant will usually detect the device automatically. You can also choose to use only the water sensor or only the P1 connection.

What is the advantage of the detachable water sensor in the V3?

The detachable water sensor with a 3‑meter cable provides installation freedom: place the sensor exactly where needed, even when your water meter and meter cabinet are far apart. You can also choose to use only the water sensor without the P1 connection.

Can I choose between WiFi and Ethernet on the V3?

Yes. The V3 offers unique firmware flexibility. You can switch between WiFi and Ethernet at any time without hardware changes. Start with WiFi and later move to a stable Ethernet connection with PoE — or the other way around — depending on your situation.

What are the benefits of the V3 compared to earlier versions?

The V3 brings important improvements: the water sensor is now detachable with a 3‑meter cable for maximum installation freedom. You can choose to measure energy only, water only, or both. The V3 adds an extra expansion port for a water leak sensor or a door sensor. Firmware can be switched between WiFi and Ethernet without hardware changes. PoE support provides stable power and data over a single cable. This makes the V3 the most modular and flexible solution to date.

Can I receive notifications for notable consumption patterns?

Yes. Together with Home Assistant you can set up notifications for specific peaks or other parameters.

Are there recurring costs associated with the WaterP1MeterKit?

No. After purchasing the kit there are no monthly fees. You only need a working Home Assistant installation.

How does the WaterP1MeterKit ensure the security and privacy of my data?

Your privacy is essential to us. Data is only sent and stored within your own network unless you choose to share it with external services. We do not use any cloud connection.

Which water and energy meters does the WaterP1MeterKit V3 work with?

The V3 is compatible with most analog water meters from brands such as Actaris, Elster, Honeywell, Itron and Sensus. For energy meters, the V3 supports all DSMR 5.0 smart meters with a P1 port from suppliers such as Landis+Gyr, Kamstrup, Sagemcom and Kaifa. Visit waterp1meterkit.nl for a complete overview with photos and model names of all compatible water and energy meters.

Can I connect an additional sensor to the V3?

Yes. The V3 has a dedicated expansion port to which you can optionally connect a water leak sensor or a door sensor (sold separately). You can use one of these sensors at a time. The sensor is integrated directly into Home Assistant alongside your energy and water data.

How can I power the WaterP1MeterKit V3?

The V3 supports two power options: USB‑C or PoE (Power over Ethernet). USB‑C is the traditional method with a separate power cable and adapter. PoE is convenient because it supplies both data and power via a single network cable — no separate power cable required. Note: PoE is only provided by dedicated PoE switches or PoE injectors. Not every network switch has PoE. If you don’t have a PoE switch, use a PoE injector or choose the USB‑C power option.

Technical Specifications

Connection to Water and Energy meter
- Water meter: Direct connection with a universal holder for mounting the water sensor on the 1-liter metal indicator of the water meter.
- Energy meter: RJ12 port for direct connection to DSMR compatible energy meters.
Network connection
- Wi-Fi IEEE 802.11 b/g/n (2.4 GHz), supports WPA/WPA2 security.
- Ethernet connection with support for Power over Ethernet (PoE) for a direct and stable network connection.
Data transfer
- Water consumption update interval: Every 1 liter.
- Energy consumption update interval: Every second for real-time insight.
Physical Dimensions of the Kit
92 x 47.5 x 26.5 mm
Cable length
- RJ12 cable for energy meter: 2 meters.
- USB-C cable for power: 3 meters.
- Sensor-to-kit cable for water meter: 3 meters (not removable).
Power supply
- USB-C port for power supply (5V, 1A) with included USB adapter (if chosen).
- Alternative power supply possible via PoE for an integrated solution without additional power cables.
Operational Classification
IP20 (suitable for indoor use).
Temperature range
Operational from -10 °C to +40 °C.
Compatibility
Compatible with DSMR versions 4.0 and 5.0 for energy meters and with all common water meters as indicated on our website; if in doubt, contact us.
Software
Fully integrated with Home Assistant, support for firmware updates (OTA) for continuously improved functionality.
Inclusive
- Universal holder with screws for easy installation on the water meter.
- Quick Start Guide
Home

Ready in 3 steps — under 2 minutes

Mount holder, connect power/network and link to Home Assistant.

Step 1

Place the universal holder

Click the universal holder onto your water meter. Fits most European analog meters.

Step 2

Connect: USB‑C (realtime) or Ethernet with PoE

Choose your power/connection and start measuring instantly.

  • USB‑C (Realtime): live data for dashboards/automations (API/MQTT).
  • Ethernet with PoE: one cable for power + data, ultra‑stable and 100% local.
Step 3

Add to Home Assistant

Open Home Assistant → Settings → Devices & Services → Integrations.

  • ESPHome: WaterP1MeterKit usually appears automatically. Click Configure and follow the steps.
  • Energy Dashboard: Settings → Dashboards → Energy; select water and DSMR (P1) entities from the kit.
You can also connect WaterP1MeterKit to DSMR Reader (stand‑alone Docker app; independent from Home Assistant).

Open Source and 100% Local with ESPHome

Our firmware is built on ESPHome. The entire configuration is transparent and adjustable. Everything runs locally without cloud dependency. Integrate directly into Home Assistant and manage updates yourself.

  • Full insight into code and YAML config
  • 100% local: no cloud, no data sharing
  • Easily extendable with your own sensors and automations

Open standards: REST API & MQTT (TLS)

For advanced users: 100% freedom

Connect with your own systems and keep control over your data. Thanks to TLS encryption and fully local integrations, privacy is standard. Use REST for HTTP integrations or choose MQTT (with username/password and optional TLS) for maximum compatibility with other platforms.

Works out‑of‑the‑box for everyone. For makers & power users everything is open and extensible: scriptable, automatable and integrable with your favorite tools.

ESPHome without Home Assistant

  • Use an MQTT broker (e.g., Mosquitto). Process topics in your own apps or automations.
  • Integrate with Node‑RED, OpenHAB, Homey or Domoticz via MQTT nodes/adapters.
  • Write data to InfluxDB (via Telegraf or Node‑RED) and visualize in Grafana.
  • The ESPHome native API is optional; universal coupling works with mqtt: in the device config.
Tip: use broker port 8883 for TLS and create per‑device credentials/certificates.

MQTT

Subscribe to all topics:

mosquitto_sub -h broker.local -p 8883 -u <user> -P <pass> \
  --cafile /path/ca.crt -t 'waterp1meterkit/#' -v

Publish a test message:

mosquitto_pub -h broker.local -p 8883 -u <user> -P <pass> \
  --cafile /path/ca.crt -t 'waterp1meterkit/cmd/restart' -m '1'

ESPHome base config (MQTT):

mqtt:
  broker: broker.local
  username: !secret mqtt_user
  password: !secret mqtt_pass
  topic_prefix: waterp1meterkit
  discovery: false
# For TLS use the secure broker port (e.g., 8883) and certificates as per ESPHome mqtt docs.

REST / HTTP

Read current values (GET):

curl -s https://waterp1meterkit.local/api/metrics \
  -H 'Authorization: Bearer <token>'

Trigger an action (POST):

curl -X POST https://waterp1meterkit.local/api/actions/restart \
  -H 'Authorization: Bearer <token>'

ESPHome http_request to your own endpoint:

# Requires a sensor with id: current_liters defined elsewhere
http_request:
  verify_ssl: true
button:
  - platform: template
    name: "Send webhook"
    on_press:
      - http_request.post:
          url: https://nodered.local/webhook/waterp1meterkit
          headers:
            Content-Type: application/json
            Authorization: Bearer <token>
          json:
            device: waterp1meterkit
            liters: !lambda "return id(current_liters).state;"

Why WaterP1MeterKit V3?

Feature
WaterP1MeterKit V3
Other solutions
Wi‑Fi, Ethernet & PoE (1 cable for power + data)
No Ethernet — and definitely no PoE
Real‑time measurement
Not always real‑time / external cloud
Open Source & ESPHome
Closed firmware or cloud dependent
Universal (optionally transparent) holder
Limited or brand‑specific holders
Integrations: Home Assistant, MQTT, InfluxDB, Grafana
Limited or paid integrations
100% local, no cloud, no monthly fees
Often cloud or account required
Measure water, P1 energy — or both simultaneously (one device)
Need two separate products to measure both
Expansion port: optional water‑leak or door sensor
No expansion port / not supported