ᐅ Which type of heating system is recommended for a KfW 55 energy-efficient house?

BAFA is also available for new constructions – it would be better if you informed yourself more about the subject or simply didn’t comment on it.

Otherwise, just leave out that trade – heating can be well insulated, so I would save myself the cost pressures from the developers, especially in that area.

Lebensprojekt schrieb:
BAFA subsidies are only available for existing properties.

With the developers I have chosen, there is always an additional cost of 9,000 to 10,000 euros compared to a gas boiler. A ground-source heat pump is about 15,000 euros plus earthworks (laying collectors, etc.), which easily adds up to 20,000 euros. Drilling per borehole costs 5,000 to 6,000 euros.

Regards

Then you chose a very profit-oriented developer.
How much does your underfloor heating + gas condensing boiler + controlled ventilation system + gas connection + fireplace cost, and what area needs to be heated? That way, we have a comparison, and based on the following answers, you might reconsider your decision.

P.S. Heat pumps (i.e., compressors) are not highly complex; they are designed so simply that they could have been built a hundred years ago. At most, the control electronics are complex, but that also applies to gas condensing boilers.

Lexmaul79 schrieb:
BAFA subsidies are also available for new constructions – it would be better if you studied the matter more thoroughly or simply didn’t comment on it.
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@Lexmaul79, he is still the person asking the question here, and it’s acceptable to kindly help him work through his confusion.

Hey Lexmaul,

Just to keep it casual and without any accusations!
I called the BAFA and asked if I could get funding for a ground-source heat pump or an air-to-water heat pump for a new build...
The answer was NO! So I have this information from a direct source, not hearsay.

I’ve been dealing with this topic for over a year now, and my approach is not to pass on rumors from others but to rely on technical literature and, of course, experiences from specialized companies. I’m well aware that everyone is just trying to sell their own product. The hype around air-to-water heat pumps is also only sponsored by...

You’re right about excluding the trade; I’ve thought about that too.
Then I can just go to the heating engineer I trust...

Best regards

nordanney schrieb:
So you’ve chosen a commercially minded developer.
How much do your underfloor heating, gas condensing boiler, mechanical ventilation system, gas connection, and fireplace cost? And what area needs to be heated? That way, we have a comparison and you might reconsider your decision based on the answers.

P.S. Heat pumps (compressors) are not highly complex; they are actually designed so simply that they could have been built a hundred years ago. At most, the control electronics are complex, but that also applies to the gas condensing boiler.

Hi Nordanney,

So far, every developer I’ve dealt with, including the well-known large ones, includes the air-to-water heat pump in the offer at about a 10,000 euro (around $11,000) surcharge compared to the gas boiler. The gas boiler is basically already included in the standard offer.
Of course, with the gas boiler, providing the liquid gas tank plus groundwork and connection is also necessary.

The planned heated area is about 140 m² (1,500 sq ft), including the fireplace, mechanical ventilation system, and underfloor heating.

I hope I haven’t forgotten anything.

Then it is quite difficult to make a price comparison. It is surprising that an air-to-water heat pump is said to be €10,000 (approximately $10,900) more expensive. This shows a good profit margin for the builder – they save on the chimney and simply replace one device with another that is only slightly more expensive.

What is the cost of renting a tank? About €200 (roughly $220) per year, estimated = €4,000 ($4,350) over the next 20 years. This already makes the gas condensing boiler somewhat more expensive...
Maintenance for the gas condensing boiler is around €100 (about $110) per year (these were our costs in the old house) = €2,000 ($2,175) over the next 20 years. This makes the gas condensing boiler even more expensive...
Chimney sweep fees??? I don’t remember the annual or biennial costs, but this also adds to the gas condensing boiler expenses...

All these are additional costs you do not have with a heat pump. Overall, it’s a calculation exercise and a decision based on personal preference, but you should consider all these points.