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WaterP1MeterKit V3

Product information

From 57,85€
70,00€ incl. 21% VAT

The WaterP1MeterKit V3 with built-in Wi-Fi, Ethernet, and PoE is the most flexible solution yet. Thanks to the detachable water sensor, you can choose to read only your energy meter, only your water meter, or both. The V3 also offers an additional expansion port for optionally connecting a water leak sensor or door sensor. This gives you real-time insight into your consumption and more – fully integrated with Home Assistant.

What's in the box:

  • WaterP1MeterKit: Measure water consumption, energy consumption, or both. Supports Wi-Fi and Ethernet with PoE for a stable wired connection.
  • Detachable water sensor with cable (3 meters): Easy to detach and flexible to position. Compatible with the included universal mount.
  • Universal water meter holder: Fits most water meters in Europe. Check the compatibility list on our website or contact us if you have any questions.
  • RJ12 cable (2 meters) for DSMR energy meter: Direct connection to your smart meter.
  • Quick Start Guide: Clear instructions for a quick installation.
  • If selected: USB-C Cable (3 meters) & Power Adapter (optional EU or Universal):
    • EU version: For standard European sockets.
    • Universal Version: Includes interchangeable plugs for use in the US, AU and UK.

Power supply:
 The WaterP1MeterKit can be powered via PoE (provided you use a compatible PoE network connection) or USB-C . PoE is not required; USB-C can always be used as an alternative power source.

Firmware Flexibility:
 You can switch between Wi-Fi and Ethernet firmware at any time without any hardware differences. The choice is entirely in the software, so you can always use the connection method that best suits your situation.

Additional extensions:
 The V3 offers an optional port for a water leak sensor or door sensor (sold separately). This makes the WaterP1MeterKit an even more versatile tool for your smart home.

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Product options

USB-C Adapter Set

USB-C Adapter Set

For stable power supply

Water Leak Sensor
Detects water leaks and flooding

Water Leak Sensor

Detects water leaks and flooding

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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

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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
WaterP1MeterKit V3

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.