I'm located in Luxembourg and planning to replace my HomeWizard P1 meter with a SlimmeLezer+.
My setup:
Creos smart meter (encrypted P1, AES-128, DSMR 5.0)
Fronius Gen24 inverter with BYD battery
Home Assistant OS 2026.5.2
Currently with the HomeWizard I receive electricity AND water consumption via the P1 port. The water meter has a wireless M-Bus dongle that sends data to the Creos smart meter, which then forwards it over P1.
My questions:
Does the SlimmeLezer+ support reading water meter data from the Luxembourg/Creos P1 port?
Is there a specific ESPHome configuration needed for Luxembourg water data?
Has anyone in Luxembourg or Belgium successfully read water consumption via SlimmeLezer+ and Home Assistant?
SlimmeLezer+ works with Creos smart meters. Electricity reading is fully supported. Luxembourg DSMR 5.0 is compatible. Water data depends on Creos output.
Thanks for the quick response! I just ordered the SlimmeLezer+. I'll test it with my Creos meter and report back whether water data is also available via P1. For reference: water consumption via P1 works fine with the HomeWizard HWE-P1-G1 on the Creos meter, so the data is definitely in the P1 telegram. Fingers crossed the SlimmeLezer+ can read it too!
Quick update: The SlimmeLezer+ is working great with the Creos meter in Luxembourg!
Electricity (import/export) works perfectly via the dedicated Luxembourg sensors (energy_delivered_lux / energy_returned_lux).
Interesting finding regarding water: Since I have no gas connection, the 'Gas Consumed' sensor is actually showing my water meter data! The water meter sends its data wirelessly via M-Bus to the Creos smart meter, which then forwards it over P1. The SlimmeLezer+ picks it up as 'Gas Consumed' - the value matches my physical water meter exactly.
So for Luxembourg users without a gas connection: if you have a wireless M-Bus water meter, it will show up under 'Gas Consumed'. Just create a template sensor in Home Assistant with device_class: water to use it correctly in the Energy Dashboard.
