ᐅ Heating System for New Construction – Which Is the Best Option?

FlohJoe schrieb:
I think, with photovoltaic systems, it might be possible to achieve a certain level of self-sufficiency with an air-source heat pump, right?

I used to think so too, until I realized that I need electricity from the photovoltaic system for the air-to-water heat pump precisely when the sun isn’t shining much – in winter.

Or has the efficiency of the systems improved enough nowadays to generate sufficient electricity even in winter? This is not about solar thermal energy but about photovoltaics, which is a bit different.

Does anyone have experience with this? The question partly comes from a suggestion to switch from an air-to-water heat pump to deep geothermal energy and instead invest the money for drilling and the brine-to-water heat pump into a photovoltaic system...

Okay. So, photovoltaic systems are basically not an option, at least without an expensive battery storage. Does anyone have experience with an air-to-water heat pump combined with solar thermal? In summer, the air-to-water heat pump could remain completely off.

No personal experience, but logical thinking.

1. A heat pump is a device that operates most efficiently at the lowest supply temperatures.
2. Solar thermal systems provide high temperatures.
3. Few heating engineers focus intensively on this, but it should be done.
4. Domestic hot water can only be used for one purpose: hot water.
5. In summer, photovoltaic systems generate electricity, which can then be used by the heat pump for hot water production.
6. If there is enough hot water available, the electricity can be used for other purposes or, if necessary, sold.
7. As mentioned above, heat pumps require good planning, no matter which type.
8. This includes a properly designed underfloor heating system.
9. If your heating load is below 5 kW at the design temperature, there is a good opportunity for DIY installation.

andimann schrieb:
From our experience, I can only give you this advice:

Get everything in WRITING! No one suddenly wanted to remember verbal promises when it came down to it...

Or just ignore the building authority, build whatever you want, and hope no one complains during construction. Once you’re in, they can’t make a big fuss over minor issues.

Best regards,

Andreas

Speaking from a buyer’s perspective: I would never, ever buy a property where I can already see, as a layperson, that the construction deviated from the approved building application. "What else might they have changed? Fire protection? Structural engineering? Insulation/airtightness?"

Bureaucracy is usually annoying. But building your own home without legal certainty is just as risky.

No, thanks…

ID confirmed.
Wow, there are real experts here.
In the energy saving regulation calculation, building components are assessed using U-values. Whether you then determine the required heating load with an air-to-water heat pump or a gas boiler, in my opinion, doesn’t really matter.
And just because you might be undecided later on (once you’ve finalized the heating concept with the installer), I don’t think you would refuse to buy a house. I find some of the claims made here really far-fetched.

bortel schrieb:

In the energy saving regulation calculation, building components are assessed based on their U-values. In my opinion, whether you then meet the required heating load with an air-to-water heat pump or a gas boiler doesn’t really matter.

Besides the quality of the building envelope, the building’s primary energy demand is important. This results not only from the envelope quality but also from the type of heating system. The keyword here is primary energy factor.