Comparison of geothermal heat pump with LWW pump

Depending on where you live, you almost never achieve the 4.5. Bavaria will be difficult to impossible. Except for self-construction.

Groundwater heat pump is cool, but the least economical after a controlled residential ventilation system. Requires about 100 years for amortization, so basically never.

I always say if gas is available, then no heat pump...

Depending on where you live, you almost never achieve 4.5. Bavaria will be difficult to impossible. Except for self-construction.

That is incorrect. Almost every manufacturer now offers an air-to-water heat pump with a seasonal performance factor >= 4.5 in most climatic conditions. Nibe, Wolf, Viessmann, Alpha Innotec/Novelan, etc. etc.

I always say if there is gas, then no heat pump...

I agree, except if you get BAFA support with an inexpensive air-to-water heat pump, then you have to compare offers in detail. Especially since controlled residential ventilation can also be subsidized by BAFA.

I always say if gas is available, then no heat pump...

Why?

Why?

Provides warmth, doesn’t cost much, lasts long, no hassle. The only hassle is the pointless mandatory solar combined with gas.

Why?

Because he had bad experiences.

Brine-water heat pumps can be inexpensive if you develop the source yourself using a trench collector.