Any device to detect hot water usage?

[Gruijter]

I use the data straight from the boiler (combi-CV) using opentherm:

[APP][Pro] OpenTherm GateWay MQTT

Homey App Store (stable version): Homey App Store (test version): OpenTherm Gateway MQTT App for Homey | Homey There already was an app for OpenTherm GateWay, OTGW for short (many thanks for your work @nlrb !): OpenTherm Gateway App for Homey | Homey I tried to install it on my new Homey Pro 2023, but that was a no-go. Installing on my older Homey did work, but the connection was somewhat unstable, and the functionality was too heavy for my application. HP2023 and MQTT support I found out …

After 5 minutes shower the lights start to flicker, and after 8 minutes showering the temperature is regulated to an uncomfortable temperature. Works like a charm with my teenage kids!