Hello,
we are currently visiting different construction companies. Everything from KfW100 to KfW55 standards is being offered. Regarding building services, whether heat pumps or gas condensing boilers combined with solar technology for hot water, we are still undecided ourselves.
Now we are wondering if KfW100 would basically be sufficient. With KfW75, there would be an interest rate advantage through subsidies, but I am not sure about that yet, nor have I calculated whether this interest rate benefit is worth it compared to the additional costs of a KfW75 house.
Is there a significant difference in terms of energy performance and costs between KfW100 and KfW75 that justifies the extra expense?
we are currently visiting different construction companies. Everything from KfW100 to KfW55 standards is being offered. Regarding building services, whether heat pumps or gas condensing boilers combined with solar technology for hot water, we are still undecided ourselves.
Now we are wondering if KfW100 would basically be sufficient. With KfW75, there would be an interest rate advantage through subsidies, but I am not sure about that yet, nor have I calculated whether this interest rate benefit is worth it compared to the additional costs of a KfW75 house.
Is there a significant difference in terms of energy performance and costs between KfW100 and KfW75 that justifies the extra expense?
KfW100 corresponds to 100%, so KfW70 equals 70%.
Savings potential: 30%.
However, the 100% reference shifts from 2016 (?) due to the new Energy Saving Ordinance 2014. Then, a KfW100 house (Energy Saving Ordinance 2009) would actually consume more than 100% 🙁
Oh dear, who is supposed to understand that? 😱
Savings potential: 30%.
However, the 100% reference shifts from 2016 (?) due to the new Energy Saving Ordinance 2014. Then, a KfW100 house (Energy Saving Ordinance 2009) would actually consume more than 100% 🙁
Oh dear, who is supposed to understand that? 😱
Well, I already understood the percentages regarding the reference house. I’m just wondering how the investment costs of a KfW75 house compare to the energy consumption of a standard KfW100 house. So, do you actually save enough for the costs to pay off after a certain period?
B
Bauexperte1 Sep 2014 19:34Good evening,
"The energy demand of a KfW 70 efficiency house is lower than that of a single-family home built purely according to the Energy Saving Ordinance. A KfW efficiency house 70 requires only 70 percent of the energy of the reference building defined by the Energy Saving Ordinance, which is set at 100%. The lower the number (KfW 55, 40, or Passive House), the more energy is saved; the higher the subsidies from KfW are." This is, in summary, the explanation from KfW.
The step from the reference building to KfW 70 is not very expensive; most builders already include underfloor heating as standard today. What is usually missing is a heat pump; at least a ventilation system with heat recovery if a gas condensing boiler is installed. Additional cost for a ventilation system with heat recovery is around 8-9 thousand euros.
Now you can calculate yourself, based on rising energy prices, when a KfW 70 efficiency house will pay off 😉
Best regards, Bauexperte
Salomea schrieb:
I already understood the percentages regarding the reference house. I’m just wondering how the investment costs of a KfW 75 house compare to the energy consumption of a standard KfW 100 house. Is the savings really enough to pay off the costs after a certain period?
"The energy demand of a KfW 70 efficiency house is lower than that of a single-family home built purely according to the Energy Saving Ordinance. A KfW efficiency house 70 requires only 70 percent of the energy of the reference building defined by the Energy Saving Ordinance, which is set at 100%. The lower the number (KfW 55, 40, or Passive House), the more energy is saved; the higher the subsidies from KfW are." This is, in summary, the explanation from KfW.
The step from the reference building to KfW 70 is not very expensive; most builders already include underfloor heating as standard today. What is usually missing is a heat pump; at least a ventilation system with heat recovery if a gas condensing boiler is installed. Additional cost for a ventilation system with heat recovery is around 8-9 thousand euros.
Now you can calculate yourself, based on rising energy prices, when a KfW 70 efficiency house will pay off 😉
Best regards, Bauexperte
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