ᐅ Which Heating System Is Suitable for a Multi-Family House If a Heat Pump Is Not Eligible for Incentives?
Created on: 24 Apr 2023 17:18
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deri254Hello,
since early 2020, I have been building a multi-family house (4 apartments with a total living area of 435 sqm (4,680 sq ft) over 2 floors, underfloor heating) in Bavaria. The energy efficiency standard is just about KfW55. At that time, I did not apply for any subsidies because I have done everything myself except for the roof structure, so I only purchased the materials. In 2020, the only option for me was to install an oil heating system. However, given the developments in recent months, the only sensible option now would be a heat pump. Since I did not apply for any funding before the start of construction in 2020, as far as I know, it is no longer possible to get subsidies for the much more expensive heat pump. Or is there still a possibility in my case to receive funding for the heat pump? Otherwise, my only option would be to install an oil or gas heating system (the latter with a biogenic liquid gas tank in the garden) before the end of the year.
Another detail: 10 meters (33 feet) away on another parcel, there is my farmhouse, completely renovated and somewhat insulated between 2014 and 2017 (approx. 118 sqm (1,270 sq ft) living area over 3 floors, with radiators), but still using a 25-year-old oil heating system. Last year, as a precaution during sewer works, I already installed a thermal pipeline between the two houses up to the boiler room. Here, funding for replacing the heating system would be possible. Would it therefore be conceivable to easily get subsidies if both houses were run with a single heating solution? According to the heating installer, a heat pump for the renovated house would not be without challenges.
Thank you.
since early 2020, I have been building a multi-family house (4 apartments with a total living area of 435 sqm (4,680 sq ft) over 2 floors, underfloor heating) in Bavaria. The energy efficiency standard is just about KfW55. At that time, I did not apply for any subsidies because I have done everything myself except for the roof structure, so I only purchased the materials. In 2020, the only option for me was to install an oil heating system. However, given the developments in recent months, the only sensible option now would be a heat pump. Since I did not apply for any funding before the start of construction in 2020, as far as I know, it is no longer possible to get subsidies for the much more expensive heat pump. Or is there still a possibility in my case to receive funding for the heat pump? Otherwise, my only option would be to install an oil or gas heating system (the latter with a biogenic liquid gas tank in the garden) before the end of the year.
Another detail: 10 meters (33 feet) away on another parcel, there is my farmhouse, completely renovated and somewhat insulated between 2014 and 2017 (approx. 118 sqm (1,270 sq ft) living area over 3 floors, with radiators), but still using a 25-year-old oil heating system. Last year, as a precaution during sewer works, I already installed a thermal pipeline between the two houses up to the boiler room. Here, funding for replacing the heating system would be possible. Would it therefore be conceivable to easily get subsidies if both houses were run with a single heating solution? According to the heating installer, a heat pump for the renovated house would not be without challenges.
Thank you.
deri254 schrieb:
However, since I did not apply for funding before construction started in 2020, as far as I know, it is no longer possible now. Or is there still a way in my case to get financial support for the much more expensive heat pump?deri254 schrieb:
Otherwise, my only option would be to install an oil or gas heating system (but with a bio-liquid gas tank in the garden) before the end of the year.No funding. But what is stopping you from installing the “heat pump without funding” option?deri254 schrieb:
Would it be conceivable, therefore, to receive funding easily if I were to run both houses with just one heating solution?I don’t think so, since you already have the multi-family house under construction. You know yourself that funding has to be applied for beforehand. That includes all facts and factors about the building project… and there you can only name the single-family house. Times have just changed.
(Your question is justified though. More so than whether it would somehow be possible to get last year’s interest rates.)
A heat pump without subsidies easily costs at least 50% more than a gas or oil heating system. I started building in early 2020, and all the materials I still need now (the shell is currently completed) cost on average around 80% more than at the start of construction. I don’t see a reason to pay the same extra premium for a heat pump heating system unless there was a significantly cheaper pump available, which might not qualify for subsidies—something that wouldn’t matter in my case.
Additionally, the alternative question for me is whether to quickly opt for the oil heating solution or at least the gas solution using biogenic liquid gas, considering the potentially huge increases in CO2 prices.
Additionally, the alternative question for me is whether to quickly opt for the oil heating solution or at least the gas solution using biogenic liquid gas, considering the potentially huge increases in CO2 prices.
deri254 schrieb:
Or is there still a way in my case to get funding for the much more expensive heat pump?deri254 schrieb:
Unless you get a significantly cheaper pump, which possibly wouldn’t be eligible for funding, but in my case that wouldn’t matter.No, for new builds you no longer receive funding for heat pumps.
The heat pump isn’t significantly more expensive in terms of material costs compared to an oil heating system if you look around. You will install it yourself, right? For monoblock units, you don’t need a refrigeration certificate, and these are also cheaper.
New build KfW55, 350m² (3,767 sq ft): heating load around 10-12 kW?
The Panasonic WH-MXC12J9E8 with 12 kW is available in Germany for just under 7,000 € (approximately). Chinese heat pumps, e.g., the NuLite New Energy NL-B345II/R32 with Panasonic compressor, can be bought through German dealers (not AliExpress imports) for a bit over 4,000 € or directly from China for half that price. A friend working as an HVAC planner installed one last winter and is very satisfied with it; the Panasonic is also solid, good technology (just a bit noisy).
There are other suppliers/manufacturers offering really good pumps beyond Viessmann and similar brands – which have actually just sold to American companies as they realized that with an annual production of 50,000 units compared to Panasonic’s millions, they have no long-term chance. Panasonic also has stronger investments and announced new K- and L-series models for the European market.
deri254 schrieb:
Last year, as a precaution during sewer pipe work, I already laid a heat pipe between the houses up to the boiler room. There could be funding available when replacing the heating system here.The heat pipe to the neighboring house then requires the same temperatures for space heating as for domestic hot water, and due to the additional heat exchanger, higher system temperatures. I wouldn’t connect them.
Better to have two separate heat pumps, each tuned to the specific building.
Thank you, dertill, for the interesting explanations.
I couldn’t install it myself, only assist. Considering all the U-values in my case, I would estimate somewhere between KW55 and KW70. If I calculate roughly (about 40 kWh per m² (11.75 kWh per ft²)), I’d say around 17 kW just for heating. Then, adding hot water for 14 people, it would come to about 28 kW total. The flow temperature would probably be around 30 kW. Many suggest that this is rather undersized and would recommend a somewhat higher capacity due to the hot water demand. Which heat pump would be suitable here, and which offers the best price/performance ratio?
It’s a rental building, so if the heating fails, that would be a major problem. That’s why I have some concerns about Chinese products, including warranty issues. Or am I completely mistaken?
I couldn’t install it myself, only assist. Considering all the U-values in my case, I would estimate somewhere between KW55 and KW70. If I calculate roughly (about 40 kWh per m² (11.75 kWh per ft²)), I’d say around 17 kW just for heating. Then, adding hot water for 14 people, it would come to about 28 kW total. The flow temperature would probably be around 30 kW. Many suggest that this is rather undersized and would recommend a somewhat higher capacity due to the hot water demand. Which heat pump would be suitable here, and which offers the best price/performance ratio?
It’s a rental building, so if the heating fails, that would be a major problem. That’s why I have some concerns about Chinese products, including warranty issues. Or am I completely mistaken?
You don’t need to add the hot water demand on top. The systems don’t operate continuously. This results in at most an increase in the total heating load. I mixed up the numbers for the square meters; 14 kW is probably more realistic.
There must be a thermal insulation certificate.
The connection isn’t that complicated. The only difference compared to an oil system is that hot water production doesn’t go through the manifold but separately via a three-way valve due to the higher temperature level. However, I wouldn’t do the planning for a multi-family house myself in this case.
There must be a thermal insulation certificate.
The connection isn’t that complicated. The only difference compared to an oil system is that hot water production doesn’t go through the manifold but separately via a three-way valve due to the higher temperature level. However, I wouldn’t do the planning for a multi-family house myself in this case.
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