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
L
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
EveundGerd17 Apr 2015 22:58You can definitely give it a try. Whether the general contractor will agree to it is a matter of negotiation.
B
Bauexperte18 Apr 2015 00:14Mycraft schrieb:
Yes, it’s that simple... however, you need to clarify this with your provider BEFORE signing the contract... No, it’s not as simple as you casually claim.
Mycraft schrieb:
He is just a salesperson trying to sell you something... so you have the upper hand before signing... First of all, a potential customer does not automatically have the upper hand; there are also salespeople who, under certain conditions, may decline an order. Secondly, salespeople can make many promises – unfortunately, there are such colleagues – whether their employers agree with those promises is another matter entirely.
If individual trades are to be carried out as self-performed work, the question of warranty always arises. It should be obvious to everyone that possible defects are not always clearly attributable to one party or another when self-performed work is done during an ongoing construction process. A provider willing to accept this will—if they are reasonable—always require an expert inspection. If they are very wise, even two inspections. Then the question of whether this makes sense arises, as inspections also come with costs.
Regards, Bauexperte
And yet, contracts are signed every day and houses are built with varying proportions of owner involvement... Most homeowners do not buy a house that is completely ready to live in after a certain construction period and once the general contractor / main contractor has finished.
We are handling the plumbing, heating, and groundwork ourselves, and I wouldn’t necessarily recommend it if you don’t have the time or patience (it’s not terrible, but it can involve a lot of running around – on the plus side, you end up knowing more about bathroom fixtures than you ever thought you would).
S
Sebastian7918 Apr 2015 08:58Then try building with an architect
B
Bauexperte18 Apr 2015 09:30Mycraft schrieb:
And yet contracts are signed and houses are built every day with various shares of owner-built work... very few self-builders purchase a house that is fully livable after a certain construction phase and once the general contractor / main contractor has finished... That is correct.
However, it makes sense for owner-built work to only start after the handover of the house, as this clearly defines the scope of the warranty. In other words, a specific construction stage is agreed upon, which the provider is responsible for delivering, and only after these works are completed and handed over to the homeowner do the owner-built tasks begin. Since controlled residential ventilation involves several interconnected elements, I would consider an advanced shell construction as part of the contract.
Regards, Bauexperte
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