Hello everyone I m trying to retrieve

[amber prairie]

How about using a measurement device for the actual power consumption of the heater? I believe Shelly has some good stuff for that.

Come to think of it, you could probably even use a shelly product to measure the power consumption of that 230V light, and infer the state of the heater based on that measurement. But it just feels wrong.

Something like this is what I had in mind: https://www.shelly.cloud/en-fi/products/product-overview/shelly-plus-1-pm-2-pack/shelly-plus-1-pm

They have 2 channel versions if you'd rather monitor what's going on with the lights.