Which heating method would you choose and why?

@ parcus: What is a DV heat pump?

Direct expansion heat pump
has no 3rd circuit, so the pump is omitted
and manages with relatively small collector areas starting from 1:1.

Regards

Hello, I want to build in the near future and cannot decide between gas and geothermal energy. The single-family house with Kfw 70 (basement, ground floor, 1st floor, and attic conversion) has 163 sqm of living space and 2 people live in it. Underfloor heating is also planned. How do I heat hot water and heating most cheaply? What is the most worthwhile and why?

Best regards

Heating with geothermal energy ultimately means heating about 30% with electricity. Considering the even higher investment costs, I would therefore rather choose gas or, for a single-family house with enough space, go for pellets.

Natural gas is currently the most expensive form, followed by oil and pellets.

All these energy sources will also significantly differentiate themselves from electricity over time, especially as the share of renewable energy increases.

It may be that electricity costs will have doubled again in 10 years, but the other energy sources are likely to be far above that.
The gap will therefore continue to widen.
Just yesterday, BMW, as a leading fuel cell developer, shelved the project.

Why else can you practically only build passive houses from 2020 onwards,...

Best regards

Natural gas is currently the most expensive form, followed by oil and pellets.

All of these energy sources will also noticeably differentiate themselves from electricity over time. Especially as the share of renewable energy increases.

Oil would be too much of a waste of space for me, better to go straight to pellets even though their price will certainly also depend on what the alternatives cost (with a discount as long as the investment costs are higher). The day will certainly come, the question is when, that electricity will be cheaper, but definitely not in the next 10 years. Wind/solar/biogas electricity must of course also be distributed and buffered, as long as one cannot use it timely and locally oneself.

Fuel cells are ultimately just batteries for hydrogen obtained by electrolysis or from natural gas.

Pellets even though their price will certainly also depend on what the alternatives cost

Pellets are less dependent on alternatives, as the price development since 2006 has shown. Here, the other alternative energy sources remained almost constant, but pellets rose above the oil price for the first time. This year it was similar.

Demand plays a big role here. But not only as a heating material but also as a raw material for production.

I mention fuel cells with regard to future developments, i.e. cars will therefore continue to be powered by oil and gas.

Of course, electricity will not be a cheap product,...

Therefore, the heating load of buildings is becoming increasingly important. The long-term goal is certainly the zero-energy house.

Best regards