ᐅ Preparation for photovoltaic or solar thermal systems with an air-to-water heat pump

Hello everyone!

Our construction will start in January (at least if the weather cooperates), and we have not planned for solar thermal or a photovoltaic system. Heating will be provided by an air-to-water heat pump from StiebelEltron.

Now, I would like to prepare for the possible retrofit of one of these systems. Our builder also offered us a solar thermal preparation. This includes two pipes from the utility room up to the attic, including insulation and sensor cables. It is supposed to cost €1,160.

Now I am wondering if a photovoltaic system might make more sense with an air-to-water heat pump?!

So, this is only about preparation!

The question is, what would need to be prepared for a photovoltaic system?

For your information: The offered solar thermal preparation would be routed through one of the wastewater ventilation stacks.

Could you give me some advice on this?

For the photovoltaic system, install two 32mm (1.25 inch) Kabuflex cable protection conduits along the same route. Material costs are approximately 20-30 euros.

Flat roof? Then have a second ventilation pipe installed next to the existing one, where the empty conduits end.

No, it’s a hip roof.
The protective sleeves shouldn’t interfere with the ventilation either, right?

They only run parallel up to the roof, and even there only because the openings are already in place. So if you visit the construction site yourself... get Kabuflex for the photovoltaic system and about 100 large cable ties... it costs around 50 euros and takes a maximum of 2 hours of work.

Solar thermal energy... do you have a swimming pool or another water consumer of similar size? If the answer is no, forget it. It doesn't get less cost-effective than that... If it is needed to "improve the numbers" for a KfW house, okay, but retrofitting is pointless.

Photovoltaics make much more sense with an air-to-water heat pump, and the preparation costs are significantly lower.

Tego12 schrieb:
Photovoltaics make much more sense with an air-to-water heat pump, and the preparation is significantly cheaper.

Photovoltaics make much more sense at least for domestic hot water supply during the summer and for partial heating in the transitional seasons when combined with an air-to-water heat pump, but in winter, when the heating actually runs, photovoltaics generate almost nothing unless you install around 20 kWp* costing about 20,000 EUR on your roof. [...]

66 modules at 300 W each require more than 100 m² (1,075 sq ft) of space!