Exhaust air heat pump (F750) with solar thermal (heating + hot water) or brine heat pump

Hello,

we are currently in the planning phase for a new single-family house (Energy Saving Regulation standard, 36.5 cm aerated concrete; 125 m² living space, underfloor heating). For several weeks now, I have been thinking hard about the heating system. Our construction company is on the Nibe track. But we had already set our sights on the construction company beforehand because, due to a fortunate circumstance, we can acquire a "very cheap" plot of land.

Since I do not want to exhaust our set budget completely and want to have some leeway for "surprises," I am currently struggling with the decision:

- Nibe F750 (exhaust air heat pump with heat recovery) in combination with a solar thermal system for heating and hot water (additional cost €11,000)
- Nibe F1255 brine ground source heat pump (approx. €14,000 including earthworks and installation, etc.)

The combination of AHP + ST is a somewhat more cost-effective solution than the brine heat pump. However, I am not only looking at the purchase price but also at operating and maintenance costs. I am setting aside the €4,000 BAFA subsidy for the brine system for now because I still have to advance the amount myself. From my point of view, most of the energy for a heat pump for heating and hot water is consumed there. I know there are many controversial discussions about exhaust air heat pumps. Therefore, I would like to use solar thermal as support (complete replacement in summer) for heating + hot water in order to reduce the costs of the exhaust air heat pump because it could still provide water heat up to 45 degrees in the cold season.

For me, as mentioned, the economic aspect is important. I look forward to your opinions. Perhaps someone can also contribute experiences ...

Heat pump and solar thermal is a maximally stupid combination.

Why do you ignore the subsidy, by the way it is 4500-5000€ alone through BAFA?

What does the basic equipment look like?

The number is clear.

What does the basic equipment look like?

The basic equipment is an F730 (decentralized, centralized). I consider a solution based on a "only" drainage heat pump to be economically totally stupid and really (operating) cost-intensive starting in the colder season. Heat pump consumption data speaks volumes ... That’s why my idea was a solar thermal system (for heating + hot water) to reduce the operating costs of the F730/F750.

New build single-family house (Energy Saving Ordinance standard

Nibe F750 (exhaust air heat pump with heat recovery)

And that is supposed to be operated economically?

Therefore, I would like to use solar thermal energy as support (complete replacement in summer) for heating + hot water

Heating in summer no, hot water yes. Support in winter rather no.

in the cold season still water heat up to 45 degrees

Any heat pump can do that, which operates like an immersion heater, namely with a lot of electricity in winter.

For me, the choice would be very simple...

Nibe F750 does not work in a standard EnEV house, with solar thermal adding to the uneconomical nature. F1255 is the clearly better choice and also okay for 14,000 including [Quelle].

Nibe F750 does not work in a standard EnEV house, with solar thermal adding to the uneconomical nature. F1255 is clearly the better choice and is okay for 14,000 including the source.

I am also slowly realizing that I really have no choice but to go with the brine solution (F1255 with heat recovery), even though I would like to have a bit more room at the end of the budget. But the BAFA, in hindsight, is still somewhat of a consolation for the investment. From my point of view, exhaust air heat pumps should not be installed at all, unless it is truly a passive house. For all other types of construction, it is just "sugarcoating".