ᐅ New construction KfW55 energy standard with gas heating, solar panels, and controlled ventilation system with heat recovery
Created on: 22 Oct 2016 14:03
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XeNiA
Hello!
We are just starting the planning of our new build, and the big question we keep discussing is the heating system.
We are building a detached single-family house with 145 sq m (1560 sq ft) plus an expanded attic of about 40 sq m (430 sq ft) with underfloor heating (including in the attic).
We want to achieve KfW55 standard. The house will be built with solid masonry and brick veneer.
One thing we definitely want is a controlled ventilation system with heat recovery.
The most cost-effective option so far seems to be a combination of gas, solar thermal, and ventilation. The construction companies we are requesting quotes from are also offering a KfW55 package with improved insulation, as it might be difficult to meet the required standards otherwise.
An alternative (the second most affordable option) would be an air-to-air heat pump instead of gas.
What are the advantages and disadvantages of these two heating systems? What would the approximate expected monthly costs be?
Some heating installers have told us that achieving KfW55 with gas is not possible at all.
We are quite confused, and everyone says something different.
What are your experiences?
Thank you very much!
We are just starting the planning of our new build, and the big question we keep discussing is the heating system.
We are building a detached single-family house with 145 sq m (1560 sq ft) plus an expanded attic of about 40 sq m (430 sq ft) with underfloor heating (including in the attic).
We want to achieve KfW55 standard. The house will be built with solid masonry and brick veneer.
One thing we definitely want is a controlled ventilation system with heat recovery.
The most cost-effective option so far seems to be a combination of gas, solar thermal, and ventilation. The construction companies we are requesting quotes from are also offering a KfW55 package with improved insulation, as it might be difficult to meet the required standards otherwise.
An alternative (the second most affordable option) would be an air-to-air heat pump instead of gas.
What are the advantages and disadvantages of these two heating systems? What would the approximate expected monthly costs be?
Some heating installers have told us that achieving KfW55 with gas is not possible at all.
We are quite confused, and everyone says something different.
What are your experiences?
Thank you very much!
Hello XeNiA, we are also leaning towards gas heating + heat pump + controlled mechanical ventilation for KFW 55. Our contact at the general contractor is confident, after consulting with "his" energy expert, that this will work with additional insulation. Have you made any progress?
K
Knallkörper8 Nov 2016 11:44When using cladding bricks, is there enough insulation incorporated between them?
I believe this is less a question of what is technically feasible and more about the costs. According to information from the Lime Sandstone Association (we would like to build with lime sandstone for the walls), a U-value of 0.16 can be achieved with cavity insulation using either 0.024 W/mK (thickness 14cm (5.5 inches)) or 0.032 W/mK (thickness 18cm (7 inches)).
K
Knallkörper8 Nov 2016 14:11For d>14, you will need special masonry anchors for the facing brick. Sand-lime brick and brick veneer are, of course, an excellent combination.
NYC76 schrieb:
Hello XeNiA, we are also leaning towards gas heating + heat pump + controlled mechanical ventilation for a KfW 55 standard. Our contact at the general contractor, after consulting with "their" energy expert, is confident that this will work with additional insulation. Have you made any progress?Unfortunately, we haven’t made much progress yet.
So far, everyone agrees that it is definitely possible with additional insulation.
Hi XeNiA,
We will also be building soon and aim to achieve KfW55 standard, preferring gas for heating. The general contractor informed us that KfW55 is possible with gas (heat recovery ventilation + ventilation system). However, it might be necessary to use a 20cm (8 inches) block plus thermal insulation instead of the monolithic construction (36.5cm (14.5 inches) aerated concrete). We can live with that...
An energy consultant will soon assess the situation and advise on how to implement it.
We will also be building soon and aim to achieve KfW55 standard, preferring gas for heating. The general contractor informed us that KfW55 is possible with gas (heat recovery ventilation + ventilation system). However, it might be necessary to use a 20cm (8 inches) block plus thermal insulation instead of the monolithic construction (36.5cm (14.5 inches) aerated concrete). We can live with that...
An energy consultant will soon assess the situation and advise on how to implement it.
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