20
Local Only Water Meter?
(lemmy.ml)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
If you are using zigbee you should check Sinope Sedna Walter valve with the optional water flow sensor. It is supported in zha using quirks from claudegel on github.
Just make sure you select the ZigBee one since their WiFi one need their proprietary hub to work.
That's a pretty neat bit of kit. If they did it in metric sizes, I'd be tempted.