Hello,
we also have a gas connection on our plot that we can have installed for €2,000.
We are currently considering which option is better. We plan to build a single-family house with 130sqm (1,400 sq ft) of living space and a full basement, designed as a KfW55 house. A photovoltaic system is also planned, intended to cover heating and general electricity consumption. We are a family of three (2 adults and 1 child).
No matter how we search, we can’t really find a way to compare the costs and benefits. What are your experiences? Which is better, more efficient, more cost-effective in the long run, and easier to maintain: a gas heating system or an air-to-water heat pump?
Thank you very much in advance.
we also have a gas connection on our plot that we can have installed for €2,000.
We are currently considering which option is better. We plan to build a single-family house with 130sqm (1,400 sq ft) of living space and a full basement, designed as a KfW55 house. A photovoltaic system is also planned, intended to cover heating and general electricity consumption. We are a family of three (2 adults and 1 child).
No matter how we search, we can’t really find a way to compare the costs and benefits. What are your experiences? Which is better, more efficient, more cost-effective in the long run, and easier to maintain: a gas heating system or an air-to-water heat pump?
Thank you very much in advance.
ludwig88sta schrieb:
It is important to stay flexible and be able to retrofit in a few decades (underfloor heating, low supply temperatures). And we completely agree on that.
bernie schrieb:
Then take a look at Switzerland, where this is already done in multi-family buildings. These buildings are not connected to the public electricity grid at all. The buildings are fully covered (roof and external walls) with photovoltaic panels, and in summer hydrogen is produced by electrolysis without feeding anything into public grids. The rents for the residents are not much higher than usual. Well, if these buildings were connected to the electricity grid, wouldn’t the whole hydrogen part be completely uneconomical?
I find it a bit difficult to pick out such a special case and say: “See, they do it, so it must make sense.”
bernie schrieb:
Gas heating systems could also be operated ecologically (we already discussed this earlier in the thread). And how? Is biogas currently fed into gas networks in significant quantities anywhere?
Regards
Specki
H
hampshire5 Jan 2020 12:00Specki schrieb:
And how? Is biogas currently being fed into the gas grid in significant quantities anywhere?This is not about biogas but about water electrolysis followed by methanation. This process produces combustible gas using electricity. The keyword is Power to Gas. You can find more information through Fraunhofer and the "Herkulesprojekt."hampshire schrieb:
This is not about biogas but about water electrolysis followed by methanation. This way, combustible gas is produced using electricity. Keyword: Power-to-Gas. You can look up Fraunhofer and the "Herkulesprojekt".Power-to-Gas, like hydrogen, has the problem of being extremely inefficient. The efficiency is very low.
I find it interesting as an energy storage technology once renewable electricity is produced so cheaply and abundantly that the low efficiency becomes irrelevant. For example, solar power in the desert generates enormous yields that are difficult to transport via electrical grids and also suffer from the drawback of the day/night cycle.
H
hampshire5 Jan 2020 12:19Yes, these are technologies that will arrive in the future but are not yet affordable today. This is usually how development progresses. Efficiency is an important and solvable issue.
L
ludwig88sta5 Jan 2020 13:48Hausbauer schrieb:
Yes, sure. No, that’s not enough.and @michertDifferent requirements for new builds
- Heat pump systems in new buildings must have a higher seasonal performance factor or improved system efficiency:
- Seasonal performance factors: Electrically powered heat pump: 4.5. Gas-powered heat pump: 1.5
- Improved system efficiency: Additional components or special system designs contribute to reducing electricity demand and grid load during cold weather.
- Furthermore, a quality check of the heat pump system after one year of operation must be contractually verified.
- Surface heating systems must be used as the heat distribution system.
..
Funding is provided for the installation of efficient heat pump systems, including retrofitting bivalent systems, if they are mainly used for hot water production and/or space heating of buildings or for supplying heat to a district heating network.
Systems that meet the technical minimum requirements are listed.
The funding amounts to up to 35% of the eligible costs.Source: BAFA@Sternchen31 How large is your property? If it’s big enough, it might be relatively easy to install a horizontal trench collector with a heat pump. It is supposed to be quite feasible to achieve a seasonal performance factor of 4.5 there, which would mean getting 35% of the costs reimbursed by BAFA.
Until 01/01/2020, the funding was not 35% of eligible costs but a fixed euro amount, right? So now I get 35% of the price of the heat pump itself, the labor costs for the heating engineer / refrigeration technician, the brine fluid, the pipes, and also the excavation work reimbursed by BAFA? Which would really be a big advantage for the horizontal trench collector brine heat pump, because the initial costs are already quite reasonable there (compared to groundwater or deep drilling), and then you get another 35% back!?
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