Geothermal vs. Air-to-Water Heat Pump

  • Erstellt am 2011-02-02 11:25:47

swix112

2011-02-03 09:15:21
  • #1
Okay thanks, but where exactly do I get this data from? The KFW application does contain numbers, but I can't do anything with them....
 

€uro

2011-02-03 09:32:34
  • #2
As a layperson, you actually can't do that either, unless you have a relevant degree in the field of technical building equipment (TGA). Even so-called "specialist companies" have problems with this, and that is exactly the reason why many construction projects with general contractors (GU/GÜ) face so many problems afterwards to the detriment of the builders. I deal a lot with such problem cases. When I look at the energy saving ordinance certificates and/or the KfW applications, there are considerable differences between these and the actual reality. Best regards
 

Erik_I

2011-02-18 10:14:08
  • #3
Hi swix112,

€uro is right when he advises you to consult an independent expert. There are different ways to find one. Either an energy consultant through the DENA (German Energy Agency) or the BAFA (Federal Office for Economic Affairs and Export Control) or a specialist engineer for building services engineering from your area.

The KfW application is basically unsuitable for using data because it only contains a few results of the energy saving ordinance proof. However, if you want to develop an energetically sensible overall concept for a property, it is necessary to align it not only with the framework conditions from the location but also with your user behavior.

This is not done by the energy saving ordinance proof, even less so in a GU/GÜ project, where the turnkey house builder has a "standard proof" for the house model X. Actually, an adjustment based on your wishes and the resulting planning changes is required.

I would also not let myself be "driven" by a €2,500 price difference, because – even if it is in the private sector – you also have to consider the profitability of the investment. After all, the system will be in operation with you for 15 – 20 years, which is quite a long time.
 

€uro

2011-02-18 14:02:54
  • #4
My addition: Both the Energy Saving Ordinance and KfW primarily have primary energy (political) objectives, i.e., the economic side of the builder is rather secondary!

Best regards
 

rs6

2011-08-27 10:36:18
  • #5
I am also planning to either use an air-to-water heat pump or a ground probe. Obviously, the air-to-water heat pump is cheaper to purchase, especially since drilling the ground probe can easily cost 5,000 to 7,000 euros. But is the air-to-water heat pump even capable of heating the house to a normal temperature in winter when outside temperatures are 0 degrees or below, or does it always need to be supplemented with electric heating? Because that would drive the consumption costs up again.

How about the durability? With Town & Country, the air-to-water heat pump from Vaillant is offered. A [B]Vaillant[/B] should last for many years, right? I know you can never say that in general. Something can always happen to electronic components...

Ralph
 

rs6

2011-08-27 13:19:52
  • #6
That sounds very interesting. Then I will probably ask the [GU] how his calculations look. Can I then write to you and you take a look to see if that could be okay?

Ralph
 

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