ᐅ Potential Savings Opportunity: KfW 70 vs. KfW 55 – Air Source Heat Pump
Created on: 1 Aug 2015 15:57
M
madingHello everyone,
We are about to start planning a new build (house) soon.
Therefore, I am wondering which KfW standard is better in terms of heating costs: is it worth investing in a KfW 55 house, or is it more economical to build a KfW 70 house (additional costs for the higher standard versus potential savings on heating costs through better insulation)?
Since we are still at the beginning, we have not yet decided between a solid construction and a prefab house. My main question is how high the savings potential of a KfW 55 house is compared to a KfW 70 house (with an air-source heat pump, around 150m² (1600 sq ft)) to justify the higher costs.
It is clear that electricity will not become cheaper.
The energy saving regulation will also be changed in April 2016, so that the 100% house will correspond to today’s valid KfW 70 standard.
Does anyone have experience with this and can share insights or tips to help with the decision?
We are about to start planning a new build (house) soon.
Therefore, I am wondering which KfW standard is better in terms of heating costs: is it worth investing in a KfW 55 house, or is it more economical to build a KfW 70 house (additional costs for the higher standard versus potential savings on heating costs through better insulation)?
Since we are still at the beginning, we have not yet decided between a solid construction and a prefab house. My main question is how high the savings potential of a KfW 55 house is compared to a KfW 70 house (with an air-source heat pump, around 150m² (1600 sq ft)) to justify the higher costs.
It is clear that electricity will not become cheaper.
The energy saving regulation will also be changed in April 2016, so that the 100% house will correspond to today’s valid KfW 70 standard.
Does anyone have experience with this and can share insights or tips to help with the decision?
Is it clear that electricity won’t get any cheaper? Actually, it should once we have storage under control… there is already overproduction. But that’s not the topic here.
Are you building with an architect? If you’re working with a general contractor or construction manager, they will probably help you make the decision through their offer and pricing...
To put it simply, you can calculate it like this: 20 kWh/m² per year for 150 m² (1615 square feet) means 3000 kWh annually – with a seasonal performance factor of 3 (which would be a good air-to-water heat pump), you’re then paying about 23 USD per month for heating. At 40 kWh/m² per year that’s around 46 USD, and at 60 kWh/m² per year about 70 USD. Over 15 years, the difference comes to 4200 USD plus interest or 8400 USD plus interest… From experience, offers tend to be marginal economically, so depending on the timeframe, they either pay off or not… so it’s neither a financial disaster nor a once-in-a-lifetime investment. I also think that the quality of life doesn’t differ much anymore – no cold walls, but also always airtight spaces with mechanical ventilation.
Are you building with an architect? If you’re working with a general contractor or construction manager, they will probably help you make the decision through their offer and pricing...
To put it simply, you can calculate it like this: 20 kWh/m² per year for 150 m² (1615 square feet) means 3000 kWh annually – with a seasonal performance factor of 3 (which would be a good air-to-water heat pump), you’re then paying about 23 USD per month for heating. At 40 kWh/m² per year that’s around 46 USD, and at 60 kWh/m² per year about 70 USD. Over 15 years, the difference comes to 4200 USD plus interest or 8400 USD plus interest… From experience, offers tend to be marginal economically, so depending on the timeframe, they either pay off or not… so it’s neither a financial disaster nor a once-in-a-lifetime investment. I also think that the quality of life doesn’t differ much anymore – no cold walls, but also always airtight spaces with mechanical ventilation.
BeHaElJa schrieb:
Is it certain that electricity won’t get cheaper? Actually, it shouldyes, actually...Actually, public transport prices should also go down since the number of users is rising rapidly.
Actually, the solidarity surcharge could be abolished...
And above all: actually, I’m not even hungry, but I still go to eat...
I see absolutely no chance for electricity prices to go down, especially as long as the grids remain privatized. Why would 'they' want to destroy their sources of income? If someone else does it, fine 🙂
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