Grewa pump API and Home Assistant integration
Every Grewa pump exposes a read-only API to its owner. You generate your own key and use it as a bearer token. There is no account with any third party involved.
Home Assistant
There is an official Grewa integration for Home Assistant, installed through HACS. It adds your pump as a single device with sensors for status, pressure, power and water temperature, alongside the rest of your smart home.
What the API reports
Live pressure, power draw, water temperature, pump status (off, standby or running) and fault state. There is no flow reading: the pump has no flow sensor, so we do not report a number we cannot measure.
Keys
Sign in to your Grewa account to generate an API key. A key is shown in full once, is never stored in a readable form, and can be revoked at any time.