50 cubic metres out — and still counting correctly
My gas meter has two data sources: an accurate one days behind, and a current one with a wrong starting value. Only together are they worth anything.
Location
Vienna
City flat: electricity and gas meters, heating zones, light, door, transit.
8 articles
tado integrated locally — then six weeks of wrong diagnoses
The local route to tado runs through HomeKit, and HomeKit allows only one controller. What followed: four plausible diagnoses, all of them wrong.
Four buttons for six heating zones — the stove counts too
In winter it is always the same four states. Clicking each one by hand across six zones is the kind of work where you forget half — usually the toilet.
400 Bad Request, and my config had never been active
Remote access answered with 400 and nothing else. Three suspects cleared — until it turned out Home Assistant no longer reads that file at all.
The model with more physics was the worse one
Four years of gas use reconstructed from 71 meter readings. My temperature model was physically sound — and off by 110 cubic metres.
A few drops, and my phone speaks up
A leak sensor under 20 euros passed a real water test in my Vienna flat: instant alert, all-clear after 30 seconds, battery warning included.
I checked 25 invoice lines — and my own device was wrong
Two years of gas bills recalculated line by line: largest deviation 0.016%. The number that was wrong came from my own meter reader.
Vienna: three integrations in one day, and a dead file
The second installation was the first to profit from the first. And on the same morning it wrote a configuration that never had any effect.