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
Bieber081515 Apr 2015 18:54Bauexperte schrieb:
Clean ... but what happens during the extraction of the gas? That question could also apply to the electricity used for the heat pump.We are installing an air-to-water heat pump from an Austrian manufacturer. The heating system is supported by a photovoltaic system. In our opinion, a heat pump allows for greater independence and can also be retrofitted later if the initial cost is too high. However, this depends on the heating load of the house and the local climate.
We have a central ventilation system with heat recovery. Some acquaintances of my mother installed one back in the early 2000s and have experienced no hygiene issues. In my view, having no ventilation is not a solution. With well-insulated, airtight houses, you would need to ventilate by opening windows four times a day. And honestly, who actually does that or would have the time to do it?
We have a central ventilation system with heat recovery. Some acquaintances of my mother installed one back in the early 2000s and have experienced no hygiene issues. In my view, having no ventilation is not a solution. With well-insulated, airtight houses, you would need to ventilate by opening windows four times a day. And honestly, who actually does that or would have the time to do it?
L
LittleWulf15 Apr 2015 19:21By "the nasty pipe," do you mean exposed piping?
And what exactly do you mean by "do you live loudly"?
Whether I am noisy inside the house or whether it is noisy outside? =)
And does "noisy" to you mean the city? Or like it will be for us in the countryside, with the small main road 200m (220 yards) away that can sometimes be a bit annoying during rush hour?
I will try to post the wall assemblies and insulation setups in the appropriate forum (if I find it). I’m curious to know if this is considered "standard" or more on the lower end. Or what might be improved there without having to pay several thousand more again.
And what exactly do you mean by "do you live loudly"?
Whether I am noisy inside the house or whether it is noisy outside? =)
And does "noisy" to you mean the city? Or like it will be for us in the countryside, with the small main road 200m (220 yards) away that can sometimes be a bit annoying during rush hour?
I will try to post the wall assemblies and insulation setups in the appropriate forum (if I find it). I’m curious to know if this is considered "standard" or more on the lower end. Or what might be improved there without having to pay several thousand more again.
LittleWulf schrieb:
By "the bad pipe," do you mean visible ductwork?
And what exactly do you mean by "do you live loud?"
Whether I am loud inside the house or if it’s noisy outside? =)?
And is loudness for you like a city? Or more like where we live in the village, with the small federal road about 200m (650 feet) away that can be a bit disturbing during rush hour?Central ventilation systems have a ductwork network for supply and exhaust air. These ducts usually run in the ceiling or within walls to each room and from the central control unit (basement/utility room) through service shafts to the roof. Fresh air is drawn from outside at the roof, while exhaust air is released there as well, with a heat exchanger located somewhere in between. Some people believe these ducts eventually get dirty and circulate germs into the rooms, but long-term experience does not support this, since the supply air is filtered and the exhaust air is vented outside anyway. That is why BeHaElJa referred to the “bad pipe.”
Decentralized systems have direct wall penetrations on the exterior wall and control each room individually.
This is also why questions arise about the appearance and noise level.
Decentralized systems tend to be noisier or transmit noise into the house.
B
Bauexperte15 Apr 2015 19:38milkie schrieb:
Decentralized systems are louder and transfer noise into the house.No, not all of them.Regards, Bauexperte
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