Which heat pump? Ventilation system / Air-to-water heat pump

@Gym, can you provide me with your invoice?

, the numbers look different here. The additional costs amount to €2200.

Goldi, I think I didn't save it. You would first have to estimate your heating demand; there are certain key figures depending on the insulation standard. Then the hot water demand, which is independent of the insulation standard.

Then search on the internet for the annual performance factor calculator.

As an example, you come to 7,000 kWh heat and 3,000 kWh hot water. Hot water share 30%.

You divide the sum by the annual performance factor value for air-to-water heat pump and brine-to-water heat pump. The difference is your difference in kWh per year. Multiply that by the heat pump tariff of your supplier.

In this example, with 3.8 for air-to-water heat pump and 4.7 for brine-to-water heat pump, you get a difference of 500 kWh and at 20 cents per kWh in the heat pump tariff, 100 euros per year.

A [Luft-Wasser-Wärmepumpe] with an annual performance factor of 3.8 is already quite optimistic, in my opinion. This year, there were several months here with an average around zero degrees, and the COP is definitely much lower then.

from on the road

Oh, so with the air-water heat pumps the numbers from the annual performance factor calculator are too good, with the ground-water heat pump too bad? I see.

In the other forum, people easily achieve values over 4 with the Panasonic. The better insulated, the higher the proportion of hot water as well. This occurs all year round, also in summer at 25 degrees outside temperature and 5 degrees ground temperature.

The consumption differences are marginal, especially with good insulation.

Definitely not loose and not everyone has such optimized heat pumps - not to mention the installation location.

In winter, these things are simply useless - now, humans tend to think short-term and say to themselves "Winter, we don't have that anymore."

But the average actually says that we still do have it, and then you sit there with your air pump and can see the meter spinning.

That this should always be argued away... not to mention the noise, which depending on the building situation is also audible.

By the way, the ground temperature is higher than 5 degrees