K
kurzweilig18 Nov 2011 12:34Hello!
Starting in January 2012, we will be renovating a single-family house from 1965 into an Efficiency House 85. I already have the assessments and requirements here.
The house has a volume of 631m³ (22,280 ft³), of which 479.64m³ (16,926 ft³) is heated.
Until now, the house has been heated with storage heaters; there are two chimneys, neither of which extends above the roof, so at least one would need to be restored. Since the roof also needs to be replaced, this wouldn’t be an issue.
There are no gas lines in our town, so if we were to use a gas boiler, we would need to either bury the tank or enclose it.
The plan includes wall and underfloor heating (in the bathroom and WC), as this minimizes space loss and allows for larger windows on the south and west sides (Uw 0.9), which is nice.
Our builder recommends an air-source heat pump with domestic hot water heating. Ground-source heat pump might be difficult because our 1087m² (11,702 ft²) plot is slightly sloped, and geothermal drilling has already failed in several projects on our street...
We are also considering designing the system so that, if there is money left (fingers crossed!), we could include a water-bearing fireplace or pellet stove with an external chimney. The ideal spot would be right above the buffer tanks...
I think an air-source heat pump should be able to operate economically here (postal code 64823), but I am also somewhat tempted by an oil heating system. The costs would remain manageable since we will have a well-insulated house...
OK, anyone who can give a guaranteed forecast for the future will become very rich, but I believe that beyond careful planning, this is as much a risk as taking out a loan. Who really knows what interest rates will be in 10 years...
Does anyone have experience with air-source heat pumps or oil heating systems in a project like this? Does anyone have other suggestions for me?
Thanks, kurzweilig
Starting in January 2012, we will be renovating a single-family house from 1965 into an Efficiency House 85. I already have the assessments and requirements here.
The house has a volume of 631m³ (22,280 ft³), of which 479.64m³ (16,926 ft³) is heated.
Until now, the house has been heated with storage heaters; there are two chimneys, neither of which extends above the roof, so at least one would need to be restored. Since the roof also needs to be replaced, this wouldn’t be an issue.
There are no gas lines in our town, so if we were to use a gas boiler, we would need to either bury the tank or enclose it.
The plan includes wall and underfloor heating (in the bathroom and WC), as this minimizes space loss and allows for larger windows on the south and west sides (Uw 0.9), which is nice.
Our builder recommends an air-source heat pump with domestic hot water heating. Ground-source heat pump might be difficult because our 1087m² (11,702 ft²) plot is slightly sloped, and geothermal drilling has already failed in several projects on our street...
We are also considering designing the system so that, if there is money left (fingers crossed!), we could include a water-bearing fireplace or pellet stove with an external chimney. The ideal spot would be right above the buffer tanks...
I think an air-source heat pump should be able to operate economically here (postal code 64823), but I am also somewhat tempted by an oil heating system. The costs would remain manageable since we will have a well-insulated house...
OK, anyone who can give a guaranteed forecast for the future will become very rich, but I believe that beyond careful planning, this is as much a risk as taking out a loan. Who really knows what interest rates will be in 10 years...
Does anyone have experience with air-source heat pumps or oil heating systems in a project like this? Does anyone have other suggestions for me?
Thanks, kurzweilig
kurzweilig schrieb:
...Does anyone have any other suggestions for me? Yes, precise sizing and calculation. Additionally, a reliable consumption forecast. This quickly clarifies the question of the most suitable heat generator! 😉 Upon careful consideration, oil is probably hardly an option.
Best regards
Hello Kurzweilig,
I am somewhat surprised that so many options are still possible. What does the energy consulting say, since an Energy Efficiency House 85 is already a great target?
As for oil, it cannot and will not be used, as Euro has already mentioned. It completely contradicts the concept and the energy efficiency standard 85. This is true both considering price developments and environmental factors such as fine dust and CO2 emissions from oil!
To develop a heating concept, a reliable calculation is needed that compares the different systems based on the standard and user conditions. Basically, all options are possible since, for example, an underground liquid gas tank is easy to implement, but with a suitable plot size, an above-ground tank is also possible. If following the sustainability approach, a gas heating system keeps all possibilities open, since it can also use purified and renewable biogas, unlike an air heat pump, which in its true nature is still an electric heating system. The recent political efforts to reduce subsidies for renewable electricity production show where electricity prices are heading.
Best regards
I am somewhat surprised that so many options are still possible. What does the energy consulting say, since an Energy Efficiency House 85 is already a great target?
As for oil, it cannot and will not be used, as Euro has already mentioned. It completely contradicts the concept and the energy efficiency standard 85. This is true both considering price developments and environmental factors such as fine dust and CO2 emissions from oil!
To develop a heating concept, a reliable calculation is needed that compares the different systems based on the standard and user conditions. Basically, all options are possible since, for example, an underground liquid gas tank is easy to implement, but with a suitable plot size, an above-ground tank is also possible. If following the sustainability approach, a gas heating system keeps all possibilities open, since it can also use purified and renewable biogas, unlike an air heat pump, which in its true nature is still an electric heating system. The recent political efforts to reduce subsidies for renewable electricity production show where electricity prices are heading.
Best regards
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