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 Soon our house would therefore be energy-wise outdated and probably worth less.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 Soon our house would therefore be energy-wise outdated and probably worth less.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:
Our neighbor has a system like that. An air-to-water heat pump installed indoors. I can clearly hear the humming noise at night. We sleep about 10–15m (33–49 feet) away... I can hear the sound distinctly. Not for sensitive people. I’m already looking forward to our new home... no air-to-water heat pump anywhere near.Then the unit was not installed correctly. Normally, you don’t hear it at all. Only when a mechanism switches does it make a clicking noise, and you can hear the water flow. But once the utility room door is closed, you don’t hear anything anymore.The neighbor’s air-to-water heat pump is an indoor unit (not an outdoor system), and as mentioned, it is installed inside the neighboring house. I only hear the humming noise at night when it is completely quiet. I believe this is low-frequency structure-borne noise that transmits to us through the roof framework. I am very sensitive to it. At the same time every night, the unit apparently starts heating the hot water, and that’s when any restful sleep ends.
When I read web articles saying, "... if you place them like this and maintain the right distance, they won’t bother the neighbors,"
but what about yourself? It has to work for you too!
One more question: Would you consider a gas heating system with a gas tank? That is, if you don’t have a natural gas connection?
This is actually one of the reasons we are leaning towards an air-to-water heat pump.
but what about yourself? It has to work for you too!
One more question: Would you consider a gas heating system with a gas tank? That is, if you don’t have a natural gas connection?
This is actually one of the reasons we are leaning towards an air-to-water heat pump.
If possible, I would avoid using a gas boiler altogether.
However, I did install one because I wasn’t willing to install wall, ceiling, or underfloor heating in the renovation project.
But if you do go for it, definitely avoid using a tank. Either you have to buy it, which means you need to pay for regular inspections (I’m not sure about the intervals), or you rent it and are tied to the supplier as the landlord.
The prices are not very appealing, either.
Also, you absolutely need to carefully consider the installation location and proper vibration isolation. Otherwise, you’ll have problems or cause them.
However, I did install one because I wasn’t willing to install wall, ceiling, or underfloor heating in the renovation project.
But if you do go for it, definitely avoid using a tank. Either you have to buy it, which means you need to pay for regular inspections (I’m not sure about the intervals), or you rent it and are tied to the supplier as the landlord.
The prices are not very appealing, either.
Also, you absolutely need to carefully consider the installation location and proper vibration isolation. Otherwise, you’ll have problems or cause them.
Thanks again for the responses!
While researching the topic, I came across something new: brine heat pumps with ground collectors.
Sounds very promising. No disturbing noise. Better coefficient of performance. Only a small additional cost.
That would give me a good feeling, even if we only have the energy saving ordinance standard.
Where’s the catch? Why is it used so rarely?
While researching the topic, I came across something new: brine heat pumps with ground collectors.
Sounds very promising. No disturbing noise. Better coefficient of performance. Only a small additional cost.
That would give me a good feeling, even if we only have the energy saving ordinance standard.
Where’s the catch? Why is it used so rarely?
T
toxicmolotof20 Dec 2017 21:48Ground collectors require a relatively large area and significant earthworks, which often leads to choosing an air-to-water heat pump instead. We have a brine-to-water heat pump with deep drilling and a photovoltaic system, and we wanted this out of conviction. This allowed for a KFW55 standard with relatively low effort on windows, insulation, and the roof. Of course, the repayment subsidy alone is not enough for that. But the photovoltaic system probably balances out to around zero in the end, the heating costs are about +$9,000, and the additional costs for windows, insulation, and the roof together were under $5,000.
Whether it was economical... I don’t know. But I like the feeling that I can say I have produced all of my heating electricity and half of my household electricity myself. It definitely isn’t cheaper, though.
Whether it was economical... I don’t know. But I like the feeling that I can say I have produced all of my heating electricity and half of my household electricity myself. It definitely isn’t cheaper, though.
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