ᐅ House construction, KfW 70 standard, approximately 150 m² – which heating system? Gas boiler or air-to-water heat pump?
Created on: 14 Apr 2015 12:58
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LittleWulf
Hello, we plan to start building our own home this year. For various reasons, we want to work with a provider that offers a complete service package. Currently, we are deciding between Fischer Bau and Helma.
About our house:
We are about 95% sure that it will be the house shown in the attachment (attachment: image from the provider Fischer Bau).
We aim to achieve KFW70 standard. No basement, underfloor heating throughout the house, blinds all around, additional towel radiator in the bathroom, brick facade, and a hip roof with a dormer.
The plot is located in a village; the roof area (with dormer) probably faces south-southeast.
I have been researching and reading about all aspects of building a house for some time now. So far, I have been quite interested in the air-to-water heat pump. It seems to be a good and reliable heating system that is somewhat future-proof. However, the more I have looked into air-to-water heat pumps, the more negatives I have found.
Both providers initially proposed a gas heating system with solar panels in their basic offers. However, upon my inquiries, both also offered an air-to-water heat pump with ventilation and exhaust air heat recovery as an alternative.
At the moment, I am quite unsure what the best heating system for our house is. Many statements about air-to-water heat pumps, such as them being very noisy and inefficient, come from the years 2010–2012. I am not sure if that is still accurate. Gas is basically not bad either, a solid heating medium with mature technology.
I hope to receive some comments and suggestions here on how best to approach this. I think ventilation and exhaust ventilation are important today since houses are very airtight, and one cannot or does not ventilate as often as needed.
But gas? Solar? Air-to-water heat pump?
I am somewhat overwhelmed by the information, and I really can’t find any independent or unbiased advice.
---------------------------------
Hello,
I have edited your post regarding the link; please observe the forum rules. Thank you!
Best regards, Bauexperte
Bauexperte
About our house:
We are about 95% sure that it will be the house shown in the attachment (attachment: image from the provider Fischer Bau).
We aim to achieve KFW70 standard. No basement, underfloor heating throughout the house, blinds all around, additional towel radiator in the bathroom, brick facade, and a hip roof with a dormer.
The plot is located in a village; the roof area (with dormer) probably faces south-southeast.
I have been researching and reading about all aspects of building a house for some time now. So far, I have been quite interested in the air-to-water heat pump. It seems to be a good and reliable heating system that is somewhat future-proof. However, the more I have looked into air-to-water heat pumps, the more negatives I have found.
Both providers initially proposed a gas heating system with solar panels in their basic offers. However, upon my inquiries, both also offered an air-to-water heat pump with ventilation and exhaust air heat recovery as an alternative.
At the moment, I am quite unsure what the best heating system for our house is. Many statements about air-to-water heat pumps, such as them being very noisy and inefficient, come from the years 2010–2012. I am not sure if that is still accurate. Gas is basically not bad either, a solid heating medium with mature technology.
I hope to receive some comments and suggestions here on how best to approach this. I think ventilation and exhaust ventilation are important today since houses are very airtight, and one cannot or does not ventilate as often as needed.
But gas? Solar? Air-to-water heat pump?
I am somewhat overwhelmed by the information, and I really can’t find any independent or unbiased advice.
---------------------------------
Hello,
I have edited your post regarding the link; please observe the forum rules. Thank you!
Best regards, Bauexperte
Bauexperte
B
Bauexperte17 Apr 2015 10:11Hello,
Regards, Bauexperte
WildThing schrieb:I completely agree with you; what bothers me is the one-sided perspective! Similar to choosing stone materials, there is no perfect solution when it comes to heat generators. I believe both sides of the coin must be considered; that’s why I am commenting on this topic in the first place.
If you follow that logic, you would have to build a passive house. Electricity isn’t exactly ecological either, and the production of heating systems is certainly not ecological at all... But sure, topics like fracking and so on are not great and speak against gas.
WildThing schrieb:For example, I am firmly convinced that in the medium term we will all have to heat with electricity; the interesting question is how this electricity will be generated.
Economically speaking, the initial costs for gas (or sometimes even for an air-source heat pump) are the lowest. And even if you have, for example, 300 euros more heating costs per year, that is still "only" 6,000 euros in additional costs over 20 years. And I would say that, for example, a ground-source heat pump with trench collectors easily costs over 6,000 euros more than a gas boiler.
Regards, Bauexperte
EveundGerd schrieb:
Our considerations: For €29,000, we can heat for a long time and pay the chimney sweep once a year for €45. At that price, we would have declined as well.
I still remember: In the initial conversation, we said we would like geothermal heating. But since, according to online research, it costs around €25,000, we were leaning more towards gas plus solar. Our consultant (the company owner) responded: How do you come up with that number? You can expect the complete heating system to cost €13,000–14,000 (including drilling but, of course, excluding the installation of underfloor heating). In the end, it was €1,700 more because the drilling had to go a bit deeper, making it more expensive. Otherwise, it matched perfectly.
B
Bauexperte17 Apr 2015 10:31f-pNo schrieb:
Our consultant (company head) said: How did you arrive at that figure? You can expect the heating system to cost around 13,000 - 14,000 euros (including drilling but, of course, excluding the installation of the underfloor heating). In the end, it was 1,700 euros more because the drilling had to be a bit deeper and therefore more expensive. Otherwise, it matched up well. This is also the typical price for installing a ground source heat pump; it only becomes more expensive if the ground requires more complex drilling measures. The unit itself is not significantly more expensive than a gas condensing boiler or an air-to-water heat pump; only the drilling risk increases the actual costs.
Regards, Bauexperte
L
LittleWulf17 Apr 2015 22:29Is it really that simple? Won't it cause problems if I have a single contractor for the entire house and then start adding separate trades myself?
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