ᐅ Is a Separate Meter and Electricity Tariff for an Air-to-Water Heat Pump Beneficial?

_Ugeen_ schrieb:

I was always told that we need two different tariffs for the air-to-water heat pump and for household electricity. Is that not the case?

Normally, no.

_Ugeen_ schrieb:

From when does the air-to-water heat pump draw electricity continuously, or is that always the case?

As soon as it is running, it consumes electricity. In summer, of course, only when hot water is being produced. In winter, sometimes continuously or for longer periods during the day.
But the normal electricity consumption of a heat pump with a 5kW heating capacity (which is more than enough for a 140sqm (1507 sqft) KFW 55 house) is only about 1kW - so quite manageable (ignoring the electric heating element, which should not activate with proper system design).

_Ugeen_ schrieb:

Maybe I haven’t fully understood the principle yet.

The principle is quite simple. Whenever the heating system is on (whether heat pump, gas, oil, or pellets), it consumes an energy source. For the heat pump, that energy source is electricity—either to produce hot water or to provide heating.

_Ugeen_ schrieb:

Okay, so it depends on the consumption. I was always led to believe that we needed two separate tariffs for the air-to-water heat pump and household electricity. Is that not the case?

You don’t have to have two meters; initially, we only planned for one meter as well. Then I looked into it and realized it makes sense financially.
4000 kWh (kilowatt hours) of household electricity costs €1042 per year, 4000 kWh (kilowatt hours) for the heat pump costs €826 per year, but 8000 kWh (kilowatt hours) for household and heat pump combined (we have about 3500 kWh consumption annually) costs €2156 per year. That’s an almost €300 difference. Since I don’t yet know how much the heat pump will consume, I initially estimated 4000 kWh. If I only need 3000 kWh, the difference is about €200. So in any case, it is worthwhile.

For us, it also pays off, with about 200 euros savings per year for a heat pump using 4500 kWh (4500 kWh) annually and general electricity consumption of 4000 kWh (4000 kWh).

Maybe we will let the first year run through a meter to accurately monitor the consumption and then decide again.

_Ugeen_ schrieb:

Maybe we’ll have everything run through one meter for the first year to accurately monitor consumption, and then reconsider.

And make sure to find out how much a second meter costs.

_Ugeen_ schrieb:

Maybe we will run everything through a meter for the first year to accurately monitor the consumption and then decide again.

And how do you want to do that with a meter? Assuming 7250 kWh per year. How is the distribution between household and heat pump?