Hello everyone,
we are currently planning our house and are considering whether the extra cost from KfW55 to KfW40 plus is "worth it." By worth it, I mean both the payback period and, of course, other advantages and disadvantages, such as a central ventilation system versus a decentralized one.
Our general contractor offers the following standard options (alternatives are possible in consultation):
My specific questions are:
1) What potential savings can be expected due to lower heating costs, electricity costs, and feed-in tariffs, assuming energy price increases, maintenance, repairs, or total failure of components are excluded? I understand that many factors play a role and this is hard to calculate, but perhaps it is possible to give at least a rough range based on comparison values and considering the following information:
2) What other advantages and disadvantages exist between KfW40 plus and KfW55?
3) Any further tips on how to make a good decision?
Thank you very much in advance for your assessment!
J.
we are currently planning our house and are considering whether the extra cost from KfW55 to KfW40 plus is "worth it." By worth it, I mean both the payback period and, of course, other advantages and disadvantages, such as a central ventilation system versus a decentralized one.
Our general contractor offers the following standard options (alternatives are possible in consultation):
- KfW 55 (no extra cost): aerated concrete blocks 36.5 cm (14 inches), air-to-water heat pump, underfloor heating, decentralized ventilation system
- KfW 40 plus (€25,000 surcharge): aerated concrete blocks 42.5 cm (17 inches), air-to-water heat pump, underfloor heating, central ventilation system, photovoltaic system + energy storage
My specific questions are:
1) What potential savings can be expected due to lower heating costs, electricity costs, and feed-in tariffs, assuming energy price increases, maintenance, repairs, or total failure of components are excluded? I understand that many factors play a role and this is hard to calculate, but perhaps it is possible to give at least a rough range based on comparison values and considering the following information:
- The house is located in NRW (mild climate)
- Roof orientation and pitch are almost ideal for photovoltaic
- The house has no basement and with the 42.5 cm (17 inches) blocks a living area of 190 m² (2045 sq ft)
- 2 adults and 2 small children
- 3 kWp photovoltaic system, 6.5 kWh battery (assumed)
- Indoor temperature about 23°C (73°F), bedrooms about 21°C (70°F)
- I am aware of the additional KfW funding options; however, the interest rate of the KfW loan is less favorable than that of our bank, so the advantage would be reduced to €8,150
2) What other advantages and disadvantages exist between KfW40 plus and KfW55?
3) Any further tips on how to make a good decision?
Thank you very much in advance for your assessment!
J.
John333 schrieb:
Hello everyone,
I have obtained the missing information from the general contractor:
- Photovoltaic system + battery storage: Minimum according to KfW requirements, which is about 2.7 kWp (2.7 kW peak) for us
- Additional costs broken down (net):
- Photovoltaic system + battery storage: €13,000
- 42.5 cm (17 inches) solid brick + extra insulation: €8,000
- The central ventilation system was already included in the price and is therefore not part of the additional cost for KfW 40 plus! Omitting it would of course be possible and would save around €4,000.
So, the KfW 40 plus package probably doesn’t pay off economically for us.
I will now get quotes for a maximally sized, turnkey photovoltaic system.
Do you have any tips on how to find providers who deliver high-quality work? These are the additional costs from KfW 55 to KfW 40 plus, right? Then you would get an additional €10,000 repayment subsidy compared to KfW 55. However, the price for the photovoltaic system seems a bit high to me, and 2.7 kWp is rather small. I would install a photovoltaic system anyway, as it’s an investment that pays off sooner or later. And with KfW 40 plus, you essentially get the battery storage as a bonus through the repayment subsidy; otherwise, a battery storage system usually doesn’t make financial sense.
World-e schrieb:
And with KfW40+, the battery storage is practically included as a bonus through the repayment grant.However, it should not be forgotten that this also comes with a feed-in cap, which basically cancels out the subsidy.Lumpi_LE schrieb:
However, one must not forget that this also comes with a feed-in cap, which pretty much cancels out the subsidy.Soft 70% and done?Lumpi_LE schrieb:
But we must not forget that this also comes with a feed-in cap, which pretty much cancels out the subsidy. What exactly do you mean by the feed-in cap?
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