Hello,
we are currently planning to build a house and are still uncertain. We would actually prefer a geothermal heat pump but are unsure if it still meets the requirements for KfW 55.
There is already a gas connection available because there used to be an old house on the site and the connections are in place. However, we also know that gas prices are rising quite a lot.
What are your opinions on this? Which option makes more sense?
we are currently planning to build a house and are still uncertain. We would actually prefer a geothermal heat pump but are unsure if it still meets the requirements for KfW 55.
There is already a gas connection available because there used to be an old house on the site and the connections are in place. However, we also know that gas prices are rising quite a lot.
What are your opinions on this? Which option makes more sense?
Zipfel_21 schrieb:
...We would actually like a geothermal heat pump but are not sure if it still fits the kfw55 standard.A geothermal heat pump with a trench collector is only practical if it is installed during the excavation of the basement.
Retrofitting it later can sometimes be done with a small excavator (<2t), but this requires rearranging a lot of soil.
For a deep borehole (vertical ground heat exchanger), the property must be accessible for heavy machinery.
There would already be a gas connection, since an old house was there before and the connections still exist. However, we also know that gas prices are rising sharply.Electricity prices for the heat pump will then likely rise as well, possibly with some delay.
W
WilderSueden1 Jan 2022 10:41If you want to do that, go ahead. In theory, a geothermal heat pump is the most efficient system. In practice, however, it is unfortunately not the most cost-effective due to the higher upfront costs. The additional expense compared to an air source heat pump is rarely recovered, especially since houses today are very well insulated.
I would advise against gas. Political plans across all parties aim to phase out fossil fuel heating. If you install a gas heating system now, you will most likely have to switch to a heat pump at your next replacement anyway. So it’s better to install the system you actually want from the start. The long-term development of electricity and gas prices is currently unpredictable. In the short term, electricity prices will probably rise because we are currently filling the gaps left by the phase-out of nuclear and coal power with gas-powered plants when wind and solar are not available.
I would advise against gas. Political plans across all parties aim to phase out fossil fuel heating. If you install a gas heating system now, you will most likely have to switch to a heat pump at your next replacement anyway. So it’s better to install the system you actually want from the start. The long-term development of electricity and gas prices is currently unpredictable. In the short term, electricity prices will probably rise because we are currently filling the gaps left by the phase-out of nuclear and coal power with gas-powered plants when wind and solar are not available.
ateliersiegel1 Jan 2022 13:02tomtom79 schrieb:
... for a 150m2 (1,615 sq ft) house, I would invest in an air-to-water heat pump and photovoltaic system; for 250m2 (2,690 sq ft), a ground-source heat pump, etc. To translate all the abbreviations, you really need to be familiar with them, and if you are, you don’t need the tip anymore 🙄
What I find a bit lacking in all this advice:
We all need to transition our energy systems. Gas is significantly less favorable than a heat pump.
The cost for all of us – just look at Ahrweiler as an example – is MUCH higher…
Yes, go ahead with the heat pump.
... I’m facing a similar decision, hesitating because of the prices, and trying to convince myself 😎
I am adding another perspective on heat pumps (air-to-water heat pump).
We even have one that is somewhat oversized.
In the first full year living in the house, we used about 2350 kWh. For 153 m² (1646 sq ft), a cozy 24°C (75°F) indoors during winter, and high hot water usage. Our heating costs come to approximately 53€ per month.
We even have one that is somewhat oversized.
In the first full year living in the house, we used about 2350 kWh. For 153 m² (1646 sq ft), a cozy 24°C (75°F) indoors during winter, and high hot water usage. Our heating costs come to approximately 53€ per month.
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WilderSueden1 Jan 2022 13:18ateliersiegel schrieb:
The cost for all of us – take Ahrweiler as an example – is MUCH higher ...This example is one of the worst cases you could choose. The Ahr Valley has a history of major floods that have far surpassed the previous record from 2016, for instance in 1804 with a significantly higher flow than in 2021. There is even a dedicated Wikipedia page for floods in the Ahr Valley. The problem last summer was not climate change but ignorance of history combined with the arrogance of trying to derive models for extreme events based on measurement series of only a few decades. And to top it off, people didn’t trust their own short-term forecasts... because it just can’t happen if it shouldn’t happen. Instead of seriously addressing the problem, election campaigns are being run and the government is now spending a lot of money to rebuild houses in the flood area...Just so no one misunderstands me here, I am absolutely in favor of not polluting the environment unnecessarily (of any kind). You don’t need any other reason than that it doesn’t belong there and we don’t really know what damage the pollution actually causes. But I am totally opposed to cheap election tactics using such misinformation and implementing measures without considering reality. That’s how you end up with decisions like shutting down nuclear and coal power while filling the gap with Russian gas. Or pushing heat pumps into old buildings with high pressure, where mainly the electric heating element runs, powered precisely by that gas supply.
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