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How to monitor water consumption via Homey

Monitor water consumption via Elster V200 water meter with Elster Falcon PR6 pulse module

7 March 2021



In the past few years I expected that our water consumption would drop as a building project in the garden was finished and we repaired some holes in the PVC foil of our pond. Also we installed an automated irrigation system instead of manually watering the garden and forgetting the time…. So I wanted to monitor water consumption digitally.

I tried this in the past with optical reading connected to Homeseer, but this was inaccurate and hence I stopped my efforts. Recently I bought a Homey Pro to be used next to my Homeseer setup. Playing around with the Homey Pro and reading the support forums I saw some new possibilities. This article describes my journey in finding the right equipment and connecting it to Homey.

My Elster V200 water meter with detached cap

Photo 1: My Elster V200 water meter with detached cap

Finding the right monitoring devices

There are multiple options available on the web how to monitor water consumption as part of your domotics/smart home. I focussed on devices making water consumption:

  • available in Homey
  • available in Homeseer
  • accurate
  • no damaging modifications to my water meter
  • affordable

So I started searching via Google, the Homey forum and Homeseer forum for possible solutions. As sensor I saw custom made pulse counters (for example some Arduino projects) and the official Elster Falcon PR pulse modules. As I currently have no Arduino based solutions yet, I decided to go for the Falcon PR modules. I looked to these a few years ago, but they were around 180 euros at that time. Prices have dropped now to around 80 euros.

Only the pulse module is not enough; a device is needed which transfers these pulses to an understandable format for Homey. I wanted a solution which:

  • is not too expensive
  • has good user community support for Homey and Homeseer
  • is reasonable easy to implement (I have a job, a family and multiple hobbies. Hence a lack of time to puzzle too long)

I started to look around for available Homey apps and found: xxx, yyy, zzz. So 2 possible options remained:

  1. Using the Fibaro Smart Implant, a Zwave based universal sensor with binary inputs, which could be used to count pulses; costs around 45 euro
  2. The Youless Energy Monitor LS120; a device which can be used to collect data from my electricity, gas and pulses from my water meter; costs around

I went for the Youless Energy monitor, although the smart implant is cheaper. Reason is that I would need much more time to get the Fibaro Smart Implant to fetch my water meter data then the Youless Energy monitor. Furthermore I have currently a older Plugwise P1 measurement device to capture my power and gas consumption, but the Plugwise company has the habit to stop supporting older devices and focus on new versions. So if it happens I have another device which can perform same functionality.

Summarized I go for:

  • Elster Falcon PR pulse module
  • Youless Energy monitor LS120

Unfortunately there are multiple versions of the Falcon PR module:

Elster Falcon PR6 and PR7 types available

Figure 1: Elster Falcon PR6 and PR7 types available

So which one is the correct one for my water meter? In documentation found on the internet (PDF) I found the following table:

Correct Elster falcon module for water meter

Figure 2: Correct Elster falcon module for water meter

When looking to the topside of my water meter I did not find a model/type. But I found it on the side:

Location of Elster water meter model code (V200)

Photo 2: Location of Elster water meter model code (V200)

So it is a Elster V200 water meter and hence I need a PR6 module, but Figure 1 lists several PR6 types… The main difference is the number of pulses per litre of the water meter. Luckily this can be found on the water meter:

Elster V200 water meter info pulse counts per litre

Photo 3: Elster V200 water meter info pulse counts per litre

So I need the order the Elster Falcon PR6 for 1 litre/pulse, i.e. Elster part number 2925M1221. Searching in Google revealed several companies in the Netherlands delivering this module. I selected the company Cedel B.V. I ordered the Youless Energy monitor LS120 from Hashop.

Article by <a href="https://smarthome.familykruse.eu/author/iamjwk/" target="_self">Jan-Willem</a>

Article by Jan-Willem


Writen by the website owner


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