Experiences with brine heat pump

When I compare my geothermal heating costs with those of the air heat pumps in the neighborhood, the drilling easily pays for itself. One should consider that the drilling is usable for a very long time, usually several heating system lifetimes.

A crucial factor for the economical operation of a heat pump is the planning of the entire system and the mode of operation.

With correct design and operation, I claim that the brine-water heat pump achieves an annual performance factor of 5 and the air-water heat pump achieves 4. That makes a difference or savings of 20%.

WOW thinks the interested reader. 20% is indeed enormous. That's true as well. Only with the absolute numbers it relativizes itself again.
Let the monthly installments shrink from 50 to 40€. That is a saving of 120€ per year. In 10 years 1200€ if I calculate correctly.
Everyone is free to continue calculating on their own.

So a tip for the OP: given the prices, I would invest some money in the absolutely correct planning of the underfloor heating and the air-water heat pump. Then add photovoltaic. In a cold region, I would raise the flow temperature slightly during the day to somewhat compensate for the cold period at night.

Do we get any reliable sources for the numbers you threw out? I can also make up suitable ones to support my thesis. For most people here, even the 50€ for an air-to-water heat pump is not correct (corresponds to about 2400 kWh annual consumption).

Heat pump consumption database. There you can read what is possible. It can be assumed that with good planning, a good annual performance factor can also be achieved.

The monthly installments were exemplary. Due to regional prices, it cannot be done otherwise. Surely you agree with me that the heating load of modern houses will be in the range between 4-7kw. Depending on standard and size. Thermal 20,000 kWh are no longer realistic.

But with higher numbers: 70€ installment per month for the brine-water heat pump with a realistic annual performance factor of 5.

Air-water heat pump annual performance factor 4. 20% more per month. So 84€. 14€x12 months = 168€/year.

168€x10 years = 1680€

Means currently over 80 years amortization.

Less the costs for a good design and implementation, we would still be in the range of 60+ years.

An expensive drilling simply is not worth it.

So in the heat pump consumption database, there are different averages.

It was not about the average, but even that shows exactly what Joedreck describes: annual performance factor 3.4 for air-water heat pump compared to 4.6 with brine-water heat pump. Whoever plans has significantly better figures in each case. If I had brine instead of an air-water heat pump, I would save €70 per year. Trench collector is economical due to subsidies, drilling is difficult with modern houses with low consumption, even if it is the nicer technology.