Hello,
We were quite certain that we wanted an air-to-water heat pump, but now we are considering whether a geothermal heating system might be the better option. This would cost us 2,500€ more for the permits and drilling. Is the additional 2,500€ really worth it?
Does anyone have advice that could help us with this decision?
We have also heard that geothermal systems are significantly more efficient than air-to-water heat pumps.
We would be very grateful for your tips and information.
Regards
We were quite certain that we wanted an air-to-water heat pump, but now we are considering whether a geothermal heating system might be the better option. This would cost us 2,500€ more for the permits and drilling. Is the additional 2,500€ really worth it?
Does anyone have advice that could help us with this decision?
We have also heard that geothermal systems are significantly more efficient than air-to-water heat pumps.
We would be very grateful for your tips and information.
Regards
swix112 schrieb:
Okay thanks, but where exactly do I get this data from? The KfW application does include numbers, but I can’t make any sense of them.... As a layperson, you generally cannot do that, unless you have a relevant degree in building services engineering. Even so-called "specialist companies" have difficulties with this, and this is precisely why many construction projects with main contractors or general contractors face numerous problems afterward that disadvantage the clients. I deal with many such cases. When I review the energy saving regulation documentation and/or the KfW applications, there are often significant discrepancies between these and the actual situation.
Best regards
Hi swix112,
€uro is right when advising you to consult an independent expert. There are several ways to find one. You can either find an energy consultant through DENA (German Energy Agency) or BAFA (Federal Office for Economic Affairs and Export Control), or a building services engineer from your local area.
The KfW application is generally not suitable for using its data, as it contains only limited results from the Energy Saving Ordinance (EnEV) certification. If you want to develop an energy-efficient overall concept for a property, it is necessary to consider not only the conditions of the location but also your usage patterns.
This is not addressed by the Energy Saving Ordinance certification, and even less so in a general contractor/design build project, where the prefabricated house manufacturer has a "standard certification" for house model X. Ideally, adjustments should be made based on your preferences and the resulting design changes.
I would also advise you not to be driven by a price difference of €2,500, since—even in a private context—you should also consider the investment’s economic viability. After all, the system will be in operation for 15–20 years, which is a considerable period of time.
€uro is right when advising you to consult an independent expert. There are several ways to find one. You can either find an energy consultant through DENA (German Energy Agency) or BAFA (Federal Office for Economic Affairs and Export Control), or a building services engineer from your local area.
The KfW application is generally not suitable for using its data, as it contains only limited results from the Energy Saving Ordinance (EnEV) certification. If you want to develop an energy-efficient overall concept for a property, it is necessary to consider not only the conditions of the location but also your usage patterns.
This is not addressed by the Energy Saving Ordinance certification, and even less so in a general contractor/design build project, where the prefabricated house manufacturer has a "standard certification" for house model X. Ideally, adjustments should be made based on your preferences and the resulting design changes.
I would also advise you not to be driven by a price difference of €2,500, since—even in a private context—you should also consider the investment’s economic viability. After all, the system will be in operation for 15–20 years, which is a considerable period of time.
Erik_IEU schrieb:
...The KfW application is generally unsuitable for using data, as it only includes a few results from the Energy Saving Ordinance verification. My addition: Both the Energy Saving Ordinance and the KfW mainly focus on primary energy (political) objectives, meaning the economic aspect for the builder is rather secondary!Best regards
I am also considering either an air-to-water heat pump or a ground probe system. Obviously, the air-to-water heat pump is cheaper to install, especially since drilling for the ground probe can cost around 5,000 to 7,000 euros. But is the air-to-water heat pump really capable of heating the house to a normal temperature during winter at outdoor temperatures of 0°C (32°F) and below, or does it always need electric backup heating? Because that would increase energy costs again.
What about durability? Town & Country offers an air-to-water heat pump from Vaillant. A Vaillant unit should last for many years, right? I know you can never really generalize. Electronic components can always fail...
Ralph
What about durability? Town & Country offers an air-to-water heat pump from Vaillant. A Vaillant unit should last for many years, right? I know you can never really generalize. Electronic components can always fail...
Ralph
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