How do these people monitor the heat output of the heatpump? Is that something you can get from the device itself? I recently installed a Nibe S2125 in my hous

How do these people monitor the heat output of the heatpump? Is that something you can get from the device itself? I recently installed a Nibe S2125 in my house, it's been running great except I don't monitor electricity consumption of just the heat pump, nor do I know how to get the heating output. I somehow doubt all these people have a specific electric meter on their heatpump, or do they? Mine runs on 400V and the meters are a bit expensive to get just for the data.