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
D
deri254
Hello,
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.
T
Teimo198826 May 2025 08:44nordanney schrieb:
Is the domestic hot water storage tank as planned?That is the crucial question. With 15 people, you really have to consider the domestic hot water supply carefully.
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nordanney26 May 2025 11:12deri254 schrieb:
A Bosch buffer tank STORA BH 500-6 ERZ connected to a domestic hot water station With that, you can fill four bathtubs and still have enough hot water left for someone to take a shower?
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wiltshire26 May 2025 13:34nordanney schrieb:
So with that, you get enough for four bathtubs full and then someone still showers with warm water? Once calculated — assuming 2/3 adults among 15 people and estimating 30 liters (8 gallons) of hot water per person per day — that results in 450 liters (119 gallons). There might be peak hot water demand in the morning, which accounts for most of the usage. It’s better not to completely drain the storage tank. Therefore, I would apply a factor of 1.5 to the daily consumption for the tank capacity. This gives a calculated volume of 675 liters (178 gallons).
I would choose a 750-liter (198 gallons) storage tank, or larger if using solar thermal, to fully utilize the energy.
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nordanney26 May 2025 13:50wiltshire schrieb:
Once estimated realistically – assuming two-thirds of 15 people are adults, with 30 liters of hot water per person per day (7.9 gallons), that equals 450 liters (119 gallons). There could be peaks in hot water usage in the morning, which make up most of the consumption. It’s better not to completely drain the storage tank. Therefore, I would apply a factor of 1.5 to the daily consumption to size the tank. This results in a calculated volume of 675 liters (178 gallons).
I would go for a 750-liter (198 gallons) tank, larger if using solar thermal, to fully utilize the energy. That’s exactly what I meant.
The tank mentioned by the original poster is available up to 1,000 liters (264 gallons). With only 500 liters (132 gallons), users will definitely complain. With four standard 180-liter (48-gallon) bathtubs, you have 400 liters (106 gallons) of nicely warmed water delivered all at once. The first two baths will still be comfortably warm; for the last bath, I’d recommend wearing neoprene.
Eight more people showering around the same time leads to about the same result – that’s more than 500 liters (132 gallons) of hot water flowing through the pipes when showering extensively (and many of us know that, for example, women with longer hair tend to need a lot of water).
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wiltshire26 May 2025 15:31nordanney schrieb:
whether people shower more or less at the same times leads to the same resultand be careful what you install in the apartments. A high-performance rain shower can easily use 30 liters per minute (8 gallons per minute).Similar topics