ᐅ Which heating system is best for our KfW 70 house without a basement?
Created on: 1 Jul 2011 15:16
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Exilhamburger
Hello,
we have been considering for a while which heating system to choose. The house will be a KfW 70 energy efficiency standard. We don’t have a basement but a utility room.
Oil, gas, pellets, or perhaps geothermal energy or a heat pump?
What a difficult question. Who has experience in this area?
The house will be about 140m² (1,500 sq ft) in size.
It is also planned to install a solar system on the roof. The geothermal package alone costs almost 15,000€; is an additional insulation package costing nearly 4,000€ really necessary?
Thank you very much for your experiences.
we have been considering for a while which heating system to choose. The house will be a KfW 70 energy efficiency standard. We don’t have a basement but a utility room.
Oil, gas, pellets, or perhaps geothermal energy or a heat pump?
What a difficult question. Who has experience in this area?
The house will be about 140m² (1,500 sq ft) in size.
It is also planned to install a solar system on the roof. The geothermal package alone costs almost 15,000€; is an additional insulation package costing nearly 4,000€ really necessary?
Thank you very much for your experiences.
ThomasW69 schrieb:
...Well, it is normal for a solar system to sometimes be less efficient, but if everyone then switches back to wood or pellets because of that, it’s not a solution. The standard off-the-shelf systems installed in general contractor projects are often only for show and usually provide little actual benefit to the homeowner. This just wastes money!It’s no coincidence that the seller/installer "forgets" the heat meter.
ThomasW69 schrieb:
..I still consider solar thermal to be the most efficient. But only if it’s a “proper” system. You won’t get that for just 7,000 euros!Best regards.
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ThomasW6912 Aug 2011 15:27But only if it is a "proper" system. However, you won’t get one for just €7,000!I agree with you. Mine was more expensive as well, but I saved a lot of money by assembling it myself.
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Exilhamburger21 Aug 2011 14:28In the meantime, we have had three viewings of detached houses. All the residents had chosen geothermal heat pumps (heating) and decentralized ventilation systems at the time and are very satisfied with them. The sales representative from our developer recommends a gas heating system. However, prices for gas and oil are rising. Geothermal should pay off in the long run, right?
Hello,
In general, prices for all energy sources tend to increase in the long term. One year, gas prices may rise sharply; another year, the cost of electricity for heat pumps or pellets may increase. Gas is often recommended by builders because it is somewhat easier to avoid mistakes (planning/dimensioning), whereas heat pumps require very precise calculations (ventilation, heating load, room heat demand, heating surfaces, hydraulics). Otherwise, they may not achieve the expected seasonal performance factor, and the initially high investment won’t be offset by correspondingly low operating costs.
However, gas heating also has a significant drawback: it usually requires purchasing a solar thermal system, which is often not economically viable for single-family homes (renewable energy law requirements).
There is no general “pro” or “con”—the specific framework conditions are always decisive.
One thing is certain: the best energy is the energy not needed in the first place. => Reduce demand! This applies to all heating options!
If the heating energy demand is low, the technical solution is usually less expensive, due to the reduced heating load.
Best regards.
Exilhamburger schrieb:
... Our builder’s sales advisor recommends a gas heating system. However, prices for gas and oil are rising. Over time, geothermal energy should pay off, right?
In general, prices for all energy sources tend to increase in the long term. One year, gas prices may rise sharply; another year, the cost of electricity for heat pumps or pellets may increase. Gas is often recommended by builders because it is somewhat easier to avoid mistakes (planning/dimensioning), whereas heat pumps require very precise calculations (ventilation, heating load, room heat demand, heating surfaces, hydraulics). Otherwise, they may not achieve the expected seasonal performance factor, and the initially high investment won’t be offset by correspondingly low operating costs.
However, gas heating also has a significant drawback: it usually requires purchasing a solar thermal system, which is often not economically viable for single-family homes (renewable energy law requirements).
There is no general “pro” or “con”—the specific framework conditions are always decisive.
One thing is certain: the best energy is the energy not needed in the first place. => Reduce demand! This applies to all heating options!
If the heating energy demand is low, the technical solution is usually less expensive, due to the reduced heating load.
Best regards.
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