Installation of one or two electricity meters?

Unfortunately, there is no cheap heating electricity in our town

Then you don’t need a heating electricity contract and therefore no second meter either. Which, by the way, often / mostly isn’t worth it anyway.

I want to take my EON electricity contract with 30 cents/kWh concluded at Media Markt to the new house and settle both house and heating electricity with it.

Then do it like that. That’s a good price.

In the next 5 years, a photovoltaic system is to be acquired. At the latest then I will need a second meter.

Nope – others have said the same. A bidirectional meter and that’s it.

Therefore my question:
Is it better for current needs to have only one meter installed?
Or should the second meter be installed right away for photovoltaic in the future, which will then just be idle for the first few years?
For such an idle second meter, is it only the 20 euro meter rent per year that applies or am I obliged to also conclude a separate electricity contract for such a meter, where accordingly a monthly basic fee is due?

See above ==> no second meter necessary

P.S. Our basic supplier offers heating electricity at HT with a one cent discount and at NT with a six cent discount. Costs then 170€ basic fee annually. Doesn’t pay off.

Our expectation is 700-800 kWh heating electricity

Really? Quote: "An average electricity consumption for heat pumps is 27 to 42 kWh per sqm of living space. This means for a house with 160 sqm of living space an average electricity consumption of about 4320 kWh to 6720 kWh." We need 10,500 kWh for 3 people with heating, hot water and electricity 180sqm * 35kWh = 6300kWh 3 people electricity = 3500kWh Hot water = ? That fits quite well.

So under 1000 kWh I also find very low, even with brine-water heat pump and kfw40. On the other hand, over 6000 kWh just for heating in the new building would be far too much!

The electricity consumption is particularly high for new buildings and shows that the design and/or settings of the entire system are poor.

Really?

Quote:
"An average electricity consumption for heat pumps ranges from 27 to 42 kWh per sqm of living space. This means for a house with 160 sqm of living space an average electricity consumption of about 4320 kWh to 6720 kWh."

We need 10,500 kWh for 3 people with heating, hot water and electricity
180 sqm * 35 kWh = 6300 kWh
3 people electricity = 3500 kWh
Hot water = ?

It’s about right.

Average values are just averages, but my house isn’t ;)
We are building EH 40+, corresponding to 25 kWh/sqm. In addition, we have 50 sqm less than you, which corresponds to a calculated heat demand of 3250 kWh/year. A brine-water heat pump should rather have a COP=5 than 4, that would be 650-800 kWh. Hot water is added to that, which in the summer half-year (and probably also transitional periods) will mostly run on photovoltaics. I think it is not completely wrong to assume that we will come out well below 1000 kWh electricity consumption for the heat pump even with hot water.

I have ignored household electricity at this point, since that goes through the normal meter anyway. But we will certainly be far from 3500 kWh, that would be almost a quadrupling of the current consumption. Even though an apartment needs less than a house, certainly not that much more.

Then you don't need a heating electricity contract and therefore no second meter. Which, by the way, often / mostly isn't worth it anyway.

Then do it that way. It's a good price.

Nope - others have already said that. Two-way meter and that's it.

See above ==> no second meter needed

P.S. Our basic supplier offers heating electricity in peak hours with a one-cent discount and off-peak with a six-cent discount. Costs 170€ basic fee annually. Not worth it.

Super, that answers all my open questions! Thanks!