Heating system new construction single-family house air-air / air-water?

The other utilities such as electricity, water, and sewage are already connected to the property. This is what I meant by the rest, but the pipeline was also good.

Yes, I will wait first to see what is actually included in the offer regarding insulation values, etc. Then I will get back to you. But the dealership is of course also a brilliant comparison.

Yes, I’m waiting first to see what is actually on offer, regarding insulation values, etc. I’ll get back to you afterwards.

Perfect! Then you will get enough tips on what might be useful.

Here’s a little warning in advance:

Perfect! Then you’ll get plenty of tips on what might make sense.

You’ll get so much information that you could add a degree in heating technology.
You’re best off if you can rule out some things in advance, like no deep drilling due to rocky ground or no southern exposure so solar power is not an option.
Don’t rely on company information—they’ll still tell you that some watts can be generated with solar even on a north-facing orientation. Take some time and research on YT; there are some informative things there.
Also, since the price will ultimately be decisive, you have to deal with whether you’re willing to dig a little deeper into your pockets for the sake of our shared future and if it’s worth it to you to move forward in a future-oriented way.
I belong to the other type (the one with the hedgehog in his pocket) and have experienced how, when criticizing prices, I was told that one has to think about the future and immediately go for heat pumps and solar.
Unfortunately, I still have to pay my heating costs myself.
Since I’m writing here anyway, one personal question if anyone is reading:
I’m still running an old oil heating system and am considering switching the boiler to a condensing boiler.
It’s supposed to use up to 20% less oil. A friend switched to condensing a year ago because of his defective chimney (like me, he also has no gas supply in the street).
It’s difficult to compare winters if you don’t constantly collect data, but he says he hasn’t achieved the 20%. In his opinion, it’s only about 10%!
If I (assuming the worst case) relate the 10% savings to the investment in the new boiler and the new flue pipe required for condensing technology, roughly 20 years come out for the payback period.
That’s why I’m still thinking about it. Has anyone switched before and can give more positive feedback?
I would also gladly operate deep drilling and brine heat pump combined with photovoltaics on the roof, but when I look at the payback period, I’d rather spend the money on trips to the “warm” south more often.
Greetings from the environmental troublemaker who would nevertheless gladly be a friend of “Greta” if his stock portfolio didn’t bring him back down to earth.

What is your solar project doing???

Thanks for asking, great to have someone who thinks along and is observant! My project back then had dragged on a bit and is not finished yet. A friend read along here and together with him we bought a warm water collector about 1m*2m (flat/no pipes) from remaining stock on "the Bay" for 70,-. For simplicity, the unit was not installed on the roof but set up fully facing south in the garden and connected to a 150-liter PE tank. A small circulation pump was switched in between and let run. In the evening, the water was not just warm, but even hot! He was thrilled. For my use case, we then oriented the unit to the west with the result that it was also fully usable for showering. It was directly heated and in actual use the heat exchanger will somewhat spoil the great efficiency. But the usage is not that high anyway when you are a "self-builder." We have already researched that if you source the parts directly from China, and since you order several parts, you get an additional industrial discount. I have already tested ordering quite a few things directly from China and had good experiences with DHL including customs clearance. DHL takes care of everything in China and delivers directly here. Even though it will not be so great in spring and autumn, I will slap 3 or 4 of those units on the roof to make hot water or at least to support it. I also shower warm in the summer mornings (warm shower person), and that saves me quite a bit since I turn off the boiler in summer and only heat the hot water separately with a 3KW heating rod, time-controlled. (It’s worth it, even though heating engineers say you should keep the boiler running! – you just have to question everything that’s "standard"!) The reason the project is still not finished despite the long time is that I plan an extension, the realization of which has also dragged on so far (new building regulations, energy saving ordinance, etc.). Unfortunately, nothing goes as fast as you want. (Since you can observe well – my post Ytong stones how thick -?!) This extension will not have a pitched roof, so I can orient the units fully south. I might be able to divert some for heating in the transition period, as I (underfloor heating with tiles) sometimes have problems with cold floors at that time because the heating does not run since it is warm again during the day. (A small warning for builders who want to cover underfloor heating with tiles also in living areas) Maybe a few square meters more, but I will not come to 9 units (that’s what you need if you want the subsidy). When the construction is finished, I will post the prices and then the results and experiences, in case there are still some DIYers. Maybe someone also wants to participate in direct import, which brings cheaper prices. I will get back in time. In this sense, first greetings from the caveman

Thank you for the interesting report and much success and even more fun with the further implementation!

I still operate an old oil heating system and am considering switching the boiler to a condensing boiler. It is supposed to consume up to 20% less oil. An acquaintance switched to condensing a year ago because of his defective chimney (like me, he also doesn’t have gas in the street).

I have no direct experience with switching to condensing technology. The depreciation costs of the new system will most likely exceed the savings. You can roughly calculate how much oil savings would be necessary to justify the investment in a new heating system at all. Even without precise data on the savings, the project may already be pointless—at least as long as the existing heating system still runs.

Presumably, cost-effective but efficient insulation measures will bring more benefits if your house has any easily sealable holes. The roof full of photovoltaics still applies! You can invest the profit in the new heating system when the old one expires.