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!
MarcWen schrieb:
We had the option of gas + storage tank or a heat pump.
The insulation was the same for both, and controlled mechanical ventilation with heat recovery was mandatory for both.What did you decide on?
BeHaElJa schrieb:
There is no absolute best – otherwise the alternatives wouldn’t exist.
You will always find a way to heat economically (ongoing costs). I believe that too!
But this idea of an absolute best is exactly the "problem"! Everyone says something different, and everyone seems to have the ultimate solution.
XeNiA schrieb:
What did you decide on?Heat pump. Solar thermal is nonsense.
MarcWen schrieb:
Heat pump. ST is nonsense. A heat pump with drilling costs about €12,000 (approximately $13,200) more from the suppliers we’ve visited so far. Is that a realistic price increase?
Ideally, we would like a heat pump, mechanical ventilation with heat recovery, and a photovoltaic system. But our budget probably won’t allow all that.
We don’t want ST, but we might accept it because with gas there’s no alternative. Or are we misinformed?
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