Gas or heat pump in a KfW55 house

PS: The whole thing only really started when everyone became totally obsessed with saving due to exorbitant energy prices. Me too. I admit it openly.

Back in my father's time, that was hardly ever an issue. Our hot water ran at 80 degrees. Phew. The scale buildup... well. At 67 the hysteresis ended, the burner (35 kW! or was it even 38? My goodness... nowadays that’s enough for 3 houses) roared and hissed to life, and a few minutes later 250 liters in the tank were back at 80 degrees. Every legionella escaped from there. One by one. On foot. Another advantage: you could usually brew coffee or tea with tap water. grin.

I'm not so sure about my geothermal heating anymore, maybe the gas heating would have sufficed after all.

I'm not so sure about my geothermal drilling anymore, maybe the gas heating would have done after all.

I envy you. The geothermal drilling is absolutely brilliant.

We couldn't do that here. It wasn't possible. It was said right away when selling the property.

I didn't want an air-to-water heat pump.

Groundwater heat pump was also not an option – groundwater is far, far away...... burying 300 sqm of surface collector on the property with Bergisches schist underneath: financially not a great idea....

A friend / colleague of mine also has geothermal drilling. In the long run, over 20 years, it definitely pays off. He operates with a COP of 5.7 (plus 6.3 kWp photovoltaic system facing south) – when I see his heating costs for a house almost twice as big, it brings tears to my eyes. He doesn't pay more than 20 euros per month.....amazing.

We are not there at all... Hot water annual performance factor is 3.7; for heating between 5.2 and 5.6... well, the first winter still has to come. Monthly it will probably be around €50 for us... also okay and no reason to panic and, by the way, also as calculated.

Monthly it will probably be about 50 € for us... also okay and no reason to panic and besides also as calculated.

It's also no reason to panic.

50,- per month is certainly not the problem, all other things are much more expensive.

Furthermore: You are heating very environmentally friendly and are thus part of the energy transition. Great. As I said, I envy you, I would also like to have something like that (just not an air-to-water heat pump, no one has been able to really convince me of these devices so far).

I'm really not sure if the additional investment in a heat pump vs. gas will ever pay off. Which parameters are being used for calculations, no one knows what gas or electricity will cost in the future....