Hello community!
We are building with high thermal insulating thermobricks, but only to the Energy Saving Ordinance standard. So far, no KfW55 level, more like KfW70 if you will. The extra cost for better insulation is 7,800€ plus either a photovoltaic system or 4 decentralized ventilation units.
(We don’t have a central controlled ventilation system installed. That’s a separate topic. My wife doesn’t want it and money is tight.)
You have to subtract a 5,000€ grant but add back about 1,500€ for the KfW certification. The subsidized interest rates don’t really offer any advantage or are even worse than regular financing options.
In the end, there are roughly 8,000€ additional costs that you would have to save with reduced energy consumption.
1. Does this take forever? What do you think?
KfW55 will become mandatory by law in 2021. Soon our house would therefore be energy-wise outdated and probably worth less. But KfW70 was still subsidized two years ago and is actually quite good already, right?
2. Even if it might not be economically worthwhile today, would you still opt for better insulation?
3. Can an air-to-water heat pump be operated without issues in a house built to Energy Saving Ordinance standards, or would it then become a major electricity consumer?
We are building with high thermal insulating thermobricks, but only to the Energy Saving Ordinance standard. So far, no KfW55 level, more like KfW70 if you will. The extra cost for better insulation is 7,800€ plus either a photovoltaic system or 4 decentralized ventilation units.
(We don’t have a central controlled ventilation system installed. That’s a separate topic. My wife doesn’t want it and money is tight.)
You have to subtract a 5,000€ grant but add back about 1,500€ for the KfW certification. The subsidized interest rates don’t really offer any advantage or are even worse than regular financing options.
In the end, there are roughly 8,000€ additional costs that you would have to save with reduced energy consumption.
1. Does this take forever? What do you think?
KfW55 will become mandatory by law in 2021. Soon our house would therefore be energy-wise outdated and probably worth less. But KfW70 was still subsidized two years ago and is actually quite good already, right?
2. Even if it might not be economically worthwhile today, would you still opt for better insulation?
3. Can an air-to-water heat pump be operated without issues in a house built to Energy Saving Ordinance standards, or would it then become a major electricity consumer?
munger71 schrieb:
Heat pumps can also use thermal baskets, groundwater, or trench collectors as heat sources. However, both options are quite expensive and will never pay back the investment.I don’t agree. For example, we purchased system collectors (a self-installation package). It costs about 3000€ including excavation work, etc.
Additionally, the brine heat pump costs around 1000€ more.
In return, you get a 4000€ subsidy from BAFA and a better annual performance factor, resulting in somewhat lower consumption compared to an air-to-water heat pump.
It gets even cheaper if you build a DIY trench collector.
However, this involves your own labor.
Just have a look at the Rosa forum for more information.
That's true. If you can rent an excavator with a driver on an hourly basis, have some technical understanding, and like to do a lot yourself, a trench collector is ideal.
We installed one at a friend's place on a Saturday.
However, it requires a lot of planning, which should not be underestimated.
And you need a heating engineer who is willing to cooperate with the process.
We installed one at a friend's place on a Saturday.
However, it requires a lot of planning, which should not be underestimated.
And you need a heating engineer who is willing to cooperate with the process.
A gas condensing boiler is not an option for us since we don’t have a gas connection. Geothermal energy sounds very promising. However, our soil is very rocky, which could turn into a huge cost trap. So far, no one has mentioned a pellet heating system. Does it work with underfloor heating, or is it too hot?
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