Exhaust air heat pump vs air-to-water heat pump + photovoltaic experiences?

  • Erstellt am 2019-04-17 15:15:08

johartje

2019-04-17 15:15:08
  • #1
Hello everyone,

we hope to get a nice plot of land in a neighboring town in the summer, so we are currently in the concrete house planning phase. We have decided to build with a general contractor. But we are not yet sure which one. The finalists are Helma and Viebrockhaus. These two mainly differ in the design of the heating system.

One provider recommends an exhaust air heat pump and currently advises against photovoltaic systems! The other provider exclusively installs air-water heat pumps in combination with central ventilation (with heat recovery) and photovoltaics with batteries.

Since these are two completely contradictory statements for laypeople like my wife and me, I thought you might be able to shed some light on our situation.

Many thanks in advance.

Johannes
 

Lumpi_LE

2019-04-17 15:47:12
  • #2
Well, those are five different things. In your text order: - Exhaust air heat pump only in passive houses - Photovoltaics are always worthwhile, advising against it only applies in deep forests (no sun) - There is initially nothing against an air-water pump, unless you are building on a high mountain - Central ventilation is good for living comfort but has nothing to do with the pump - Photovoltaics with battery only at KfW40+ to qualify for the subsidy
 

johartje

2019-04-17 15:58:16
  • #3


Hello Lumpi,

yes, I do indeed mix many things up Thanks anyway for your quick reply. That would mean for me: Photovoltaics: yes, definitely (possibly with battery) Ventilation: yes, definitely (either integrated in the exhaust air heat pump or separate with the air/water heat pump)

So do I understand correctly that it all comes down to the question of exhaust air heat pump or air/water heat pump? Do you have a general recommendation here? Or do you need more data for such information?

Best regards Johannes
 

ares83

2019-04-17 16:13:43
  • #4
Well, the recommendation was to consider an exhaust air heat pump only in a [Passive House].
 

Lumpi_LE

2019-04-17 16:33:17
  • #5
Exactly, in a "real passive house". Kfw40 is not a passive house. Passive house includes, among other things, 40cm insulation, south orientation... etc. If you are not planning something like that, then no exhaust air heat pump. Also no combined devices.
 

johartje

2019-04-17 21:37:09
  • #6
Sorry to have to ask such a stupid question again.
- A KfW 40+ is not a passive house, right?
- Therefore, an exhaust air heat pump is not worthwhile for other house categories because the electricity consumption for operation is higher than, for example, with air/water?
- Is an air/water heat pump combined with photovoltaic a sensible concept for a KfW 40+ house with 175sqm?

Best regards,

Johannes
 

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