ᐅ Exhaust air heat pump (F750) combined with solar thermal system (heating + domestic hot water) or ground source heat pump
Created on: 18 Jun 2019 11:09
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DonTermiHello,
we are currently in the planning phase for a new single-family house (Energy Saving Ordinance standard, 36.5 cm (14 inches) aerated concrete; 125 m² (1,345 ft²) living area, underfloor heating). For several weeks, I have been thinking a lot about the heating system. Our construction company is recommending the Nibe approach. However, we had already chosen this builder beforehand because, thanks to a fortunate circumstance, we can acquire a "very affordable" plot of land.
Since I don’t want to use up our entire budget and want some flexibility for "unexpected costs," I am struggling to decide between:
- Nibe F750 (exhaust air heat pump with heat recovery) combined with a solar thermal system for heating and hot water (additional cost €11,000)
- Nibe F1255 ground-source heat pump (approx. €14,000 including earthworks, installation, etc.)
The combination of exhaust air heat pump + solar thermal is a somewhat more cost-effective solution than the ground-source heat pump. However, I’m not only considering the purchase price but also the operating and maintenance costs. I am initially disregarding the €4,000 BAFA subsidy for the ground-source system, as I would still have to finance the full amount upfront.
From my perspective, the majority of energy for a heat pump system is used for heating and hot water. I am aware of the many controversial discussions about exhaust air heat pumps. That is why I would like to use solar thermal support (complete replacement in summer) for heating and hot water to reduce costs related to the exhaust air heat pump, as it can still provide water temperatures up to 45°C (113°F) during the cold season.
For me, as mentioned, the economic aspect is important. I look forward to your opinions. Perhaps someone already has experience to share...
we are currently in the planning phase for a new single-family house (Energy Saving Ordinance standard, 36.5 cm (14 inches) aerated concrete; 125 m² (1,345 ft²) living area, underfloor heating). For several weeks, I have been thinking a lot about the heating system. Our construction company is recommending the Nibe approach. However, we had already chosen this builder beforehand because, thanks to a fortunate circumstance, we can acquire a "very affordable" plot of land.
Since I don’t want to use up our entire budget and want some flexibility for "unexpected costs," I am struggling to decide between:
- Nibe F750 (exhaust air heat pump with heat recovery) combined with a solar thermal system for heating and hot water (additional cost €11,000)
- Nibe F1255 ground-source heat pump (approx. €14,000 including earthworks, installation, etc.)
The combination of exhaust air heat pump + solar thermal is a somewhat more cost-effective solution than the ground-source heat pump. However, I’m not only considering the purchase price but also the operating and maintenance costs. I am initially disregarding the €4,000 BAFA subsidy for the ground-source system, as I would still have to finance the full amount upfront.
From my perspective, the majority of energy for a heat pump system is used for heating and hot water. I am aware of the many controversial discussions about exhaust air heat pumps. That is why I would like to use solar thermal support (complete replacement in summer) for heating and hot water to reduce costs related to the exhaust air heat pump, as it can still provide water temperatures up to 45°C (113°F) during the cold season.
For me, as mentioned, the economic aspect is important. I look forward to your opinions. Perhaps someone already has experience to share...
Heat pumps and solar thermal systems are a highly inefficient combination.
Why are you ignoring the subsidies? By the way, there is funding of 4500–5000 € (approximately 4800–5400 USD) available just through BAFA.
What does the basic setup look like?
The number speaks for itself.
Why are you ignoring the subsidies? By the way, there is funding of 4500–5000 € (approximately 4800–5400 USD) available just through BAFA.
What does the basic setup look like?
The number speaks for itself.
guckuck2 schrieb:
What is included in the basic setup?The basic setup is an F730 (decentralized or centralized). I consider a solution based solely on an exhaust air heat pump to be economically unwise and quite (operational) cost-intensive, especially starting in the colder seasons. The heat pump consumption database clearly shows this... That’s why my idea was to use solar thermal energy (for heating and domestic hot water) to reduce the operating costs of the F730/F750 system.
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nordanney18 Jun 2019 11:53DonTermi schrieb:
New construction single-family house (Energy Saving Ordinance standard) DonTermi schrieb:
Nibe F750 (exhaust air heat pump with heat recovery) And that is supposed to be economical to operate?
DonTermi schrieb:
That’s why I would like to use solar thermal as support (complete replacement in summer) for heating and hot water Heating in summer, no; hot water, yes. Support in winter, rather no.
DonTermi schrieb:
In the cold season, water heating up to 45°C (113°F) Any heat pump can do that, but it works like an immersion heater, meaning it uses a lot of electricity in winter.
For me, the choice would be very simple...
Lumpi_LE schrieb:
The Nibe F750 does not work well in a standard building code house, and adding solar thermal only makes it more uneconomical.
The F1255 is clearly the better choice and is acceptable at 14,000 including the ground source. I am slowly coming to realize that I really cannot avoid going with the ground source (F1255 with heat recovery) solution, even though I would have preferred some more budget flexibility. But the BAFA subsidy, in hindsight, is somewhat of a consolation for the investment.
In my view, exhaust air heat pumps should not be installed at all unless it is truly a passive house. For all other construction types, it is just "window dressing."
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