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Bauexperte28 Aug 2010 10:14Hello,
KfW Efficiency House 70 (formerly KfW 60) refers to houses with a minimum energy efficiency standard. This is based on the Energy Saving Ordinance (Energieeinsparverordnung), which sets the criteria for the modern, efficient building standard (KfW 100). The KfW 70 efficiency house is allowed to consume only 70% of the energy permitted for KfW 100. This classification also affects the subsidies provided by the KfW, which is why it is named KfW Efficiency House 70.
Definition of KfW Efficiency House 70
Compared to the KfW 55 house type (formerly KfW 40), the subsidy requirements for KfW Efficiency House 70 (formerly KfW 60) are less strict. The improvements over the KfW 100 standard (low-energy house) according to the Energy Saving Ordinance are also smaller:
· Annual primary energy demand Qp and transmission heat loss HT’ are a maximum of 70% of the values allowed under the 2007 Energy Saving Ordinance, and
· Annual primary energy demand is a maximum of 60 kWh per m² (square meter) of usable floor area AN
How is KfW 70 achieved?
Windows and doors insulate almost as well as the exterior walls. Buildings with oil or gas condensing boilers or heat pumps, constructed with external thermal insulation composite systems (ETICS), generally require a central ventilation system with heat recovery. Depending on the masonry and wall thickness (e.g., 36.5cm (14 inches)), it may be possible to do without a ventilation system. However, the technical equipment must then be upgraded according to the annual primary energy demand; for example, with a ground-source or air/water heat pump.
Subsidies for KfW Efficiency House 70
The KfW (Reconstruction Credit Institute) supports the purchase or construction of energy-saving houses with low-interest loans. One type of house supported is the KfW Efficiency House 70 (formerly KfW 60). The KfW’s funding program is called “Ecological Building” and offers loans up to €50,000.00.
Kind regards
Viti schrieb:KfW Efficiency House 70
What exactly does a house need to have to achieve KfW70??
KfW Efficiency House 70 (formerly KfW 60) refers to houses with a minimum energy efficiency standard. This is based on the Energy Saving Ordinance (Energieeinsparverordnung), which sets the criteria for the modern, efficient building standard (KfW 100). The KfW 70 efficiency house is allowed to consume only 70% of the energy permitted for KfW 100. This classification also affects the subsidies provided by the KfW, which is why it is named KfW Efficiency House 70.
Definition of KfW Efficiency House 70
Compared to the KfW 55 house type (formerly KfW 40), the subsidy requirements for KfW Efficiency House 70 (formerly KfW 60) are less strict. The improvements over the KfW 100 standard (low-energy house) according to the Energy Saving Ordinance are also smaller:
· Annual primary energy demand Qp and transmission heat loss HT’ are a maximum of 70% of the values allowed under the 2007 Energy Saving Ordinance, and
· Annual primary energy demand is a maximum of 60 kWh per m² (square meter) of usable floor area AN
How is KfW 70 achieved?
Windows and doors insulate almost as well as the exterior walls. Buildings with oil or gas condensing boilers or heat pumps, constructed with external thermal insulation composite systems (ETICS), generally require a central ventilation system with heat recovery. Depending on the masonry and wall thickness (e.g., 36.5cm (14 inches)), it may be possible to do without a ventilation system. However, the technical equipment must then be upgraded according to the annual primary energy demand; for example, with a ground-source or air/water heat pump.
Subsidies for KfW Efficiency House 70
The KfW (Reconstruction Credit Institute) supports the purchase or construction of energy-saving houses with low-interest loans. One type of house supported is the KfW Efficiency House 70 (formerly KfW 60). The KfW’s funding program is called “Ecological Building” and offers loans up to €50,000.00.
Kind regards
I would generally recommend it to you... You will not be able to ventilate the house as effectively, or even remotely close to how a mechanical ventilation system with heat recovery can. This applies whether you choose a centralized or decentralized system.
The heat lost through proper quick ventilation / cross ventilation, which is already significant, cannot be immediately restored. The heating system of the house is simply not capable of compensating for that instant heat loss. This is something future homeowners should clearly keep in mind!
The heat lost through proper quick ventilation / cross ventilation, which is already significant, cannot be immediately restored. The heating system of the house is simply not capable of compensating for that instant heat loss. This is something future homeowners should clearly keep in mind!
Hello,
Ventilation systems are primarily a matter of comfort! Comfort means costs of about 5,000 to 10,000 euros for a single-family house.
They are not mandatory, but sometimes necessary and unavoidable!
It is advisable to seek professional and independent advice on this. The cost of advice is insignificant compared to the installation and operating costs.
Best regards
Viti schrieb:
....is a ventilation system still needed for this, or can it be omitted
Ventilation systems are primarily a matter of comfort! Comfort means costs of about 5,000 to 10,000 euros for a single-family house.
They are not mandatory, but sometimes necessary and unavoidable!
It is advisable to seek professional and independent advice on this. The cost of advice is insignificant compared to the installation and operating costs.
Best regards
I would like to join in and additionally ask:
What is the expected final energy demand (not primary energy demand!) per m² per year for a KfW Efficiency House 70? For the KfW 60 house, it was 60 (primary energy), which with a gas heating system automatically corresponded to 60 final energy. But since the calculation basis has somehow changed, no one really understands it anymore...
Does anyone have experience? An estimate within +/- 5 kWh/(m²·a) would be sufficient for me. (By the way: Is this the real m² or a theoretical m² based on the reference building calculation...?)
Thanks
What is the expected final energy demand (not primary energy demand!) per m² per year for a KfW Efficiency House 70? For the KfW 60 house, it was 60 (primary energy), which with a gas heating system automatically corresponded to 60 final energy. But since the calculation basis has somehow changed, no one really understands it anymore...
Does anyone have experience? An estimate within +/- 5 kWh/(m²·a) would be sufficient for me. (By the way: Is this the real m² or a theoretical m² based on the reference building calculation...?)
Thanks
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