My heat pump will say how much kWh of heat it has output (~2400kWh last month). I also have a separate electrical meter just for the heat pump that tells me how

My heat pump will say how much kWh of heat it has output (~2400kWh last month). I also have a separate electrical meter just for the heat pump that tells me how much electricity it consumed (~700kWh last month). I simply divide the heat output by the electricity consumed which gives me a COP of ~3.4. I can connect the meter to the heat pump, in which case the pump will use pulses from the meter to calculate it internally, but i havent set that up. I have no idea why it doesnt come with an integrated meter... seems like that would be easier tbh.