Installation of one or two electricity meters?

So at least I don't have a meter for the total current. Only broken down into heating and hot water. But nothing for UWP and ventilation and control.

Often only heat quantity meters, from whose data the electricity consumption is then "calculated" and thus quite inaccurate.

I believe for me it is exactly the other way around, for example.

My Dimplex has heat quantity meters for heating, hot water, and brine. The consumption calculated this way is about 10% lower than what I now measure with a calibrated electricity meter. I find the very high standby consumption, which is constantly present, particularly interesting.

We have two connections: one for the household electricity and one for the heat pump. A discounted electricity contract has been concluded here, but it is interrupted twice a day. The photovoltaic system is integrated with a cascade circuit.

The same applies to us, namely through the basic supplier at about 16 cents/kWh and once a day for 1-2 hours EVU.

Is it better to have only one meter installed for current needs?

I only wanted one meter. The second meter costs a basic fee, the second contract costs a basic fee. You have to make up for all that first with cheaper electricity. Our expectation is 700-800 kWh heating electricity, of which the photovoltaic system also contributes a certain amount that I currently find hard to estimate. But the price difference would have to be quite large for two meters to be advantageous. I am also bothered by the shutdown by the grid operator.