Space and cost for geothermal heat pump

Shrimp, a heat pump sounds ecological at first because it uses environmental heat (air, water, ground...). But the fact is, it requires the "noble" energy electricity. Very roughly, you can say that to generate 1kWh of electricity, you have to produce 3kWh of heat, for example from coal.

An air heat pump roughly has an annual performance factor of 3 - 3.5. That means it converts 1kWh of electricity into 3kWh of heat. This means, in the end, you roughly use as much "primary energy" as if you had directly burned the fossil fuel to heat.

About the costs: one kWh of electricity costs about 20 cents. Gas about 6 cents. Because of the annual performance factor of 3, you divide the electricity price by 3, so the thermal kWh then costs 6.6 cents. So it is more expensive, purely in terms of consumption.

What heating capacity are we actually talking about? How many m² of living space? Insulation?

Drilling for €8,500. That is cheap!

Two boreholes of 70m each have been made, incl. connections.

What exactly do "more money" or "about the same amount" mean in numbers ...?

Rhenish greetings from on the road

I calculate for such rough estimates with 20 cents per kWh electricity, 5-6 cents per kWh gas, annual performance factor 3-3.5 for air heat pumps, 4-4.5 for ground source heat pumps.
If you now know your heating energy demand, you can make an estimate.

Thank you Sir

It is not enough to just make a simple statement without specifying the background of your consideration. Even if it has been described countless times here; not every new member struggles through the forums

On the whole, your rough calculation is flawed because it ignores the production costs; but you know that. I also think that gas condensing boilers from 2016 onwards will have a harder time (my personal opinion).

Rhineland greetings from the road

You're right. Such comparisons can only ever show tendencies. Whether in the end it's 100, 200, or 300€ per year in difference, you don't know beforehand. But at least it shows that there are no "worlds" in between the consumption costs.

With the production costs, which of course have to be considered, it's sometimes quite different. But that also depends on: How much does the gas connection cost, do I possibly want a fireplace for a stove anyway, do I have space for flat collectors, am I allowed to drill deep, what is my design temperature (-10 or -16), how well insulated is my house.

And a forum can't help with that; everyone has to go through it themselves or pay someone to calculate it.

I would recommend everyone to make only one hole and leave the cheese with the multiple holes - of course only where that is possible/allowed!