ᐅ KfW 55 or just the Energy Saving Regulation – Gas heating and minimal ventilation?
Created on: 16 Feb 2018 10:23
S
Sony70
Hello dear forum members,
We will start building our house in September and have already signed a contract with the builder for a KFW 55 house with a central ventilation system and an air-source heat pump.
However, just the day before yesterday, the question arose again—after we realized that the kitchen extractor hood can only be installed as recirculation and not as exhaust due to the ventilation system and the negative pressure caused by an exhaust extractor hood—whether we should build a house more like in the past, meaning not so airtight that we would need a ventilation system, and use gas heating. Initially, this was our plan, but the sales representative at the builder advised against it. Since houses nowadays are so airtight, a ventilation system is necessary. That results in dry air, so additional measures are required. Also, the air-source heat pump is expensive, consumes a lot of electricity or makes you dependent on electricity prices, and with all its electronics, it is quite prone to malfunctions. If it breaks down, significant replacement costs are to be expected.
Yesterday, I spoke with the site manager at the builder about this issue. We discussed this question as well. He said that he would personally build his own house without ventilation and with gas or oil heating. Now the question is: Is this still allowed nowadays under the 2016 Energy Saving Ordinance (EnEV 2016), or will the requirements force me to build such an airtight house again that I would need a ventilation system? Then there is the question of whether I would really save anything overall by switching from the air-source heat pump to gas heating, since I would need an indoor chimney again.
Is it true that if I use gas, I definitely have to install solar thermal panels on the roof, or is there still the alternative of building the house more airtight (which of course would require ventilation again)?
Thank you in advance for your advice.
Best regards,
Sony
We will start building our house in September and have already signed a contract with the builder for a KFW 55 house with a central ventilation system and an air-source heat pump.
However, just the day before yesterday, the question arose again—after we realized that the kitchen extractor hood can only be installed as recirculation and not as exhaust due to the ventilation system and the negative pressure caused by an exhaust extractor hood—whether we should build a house more like in the past, meaning not so airtight that we would need a ventilation system, and use gas heating. Initially, this was our plan, but the sales representative at the builder advised against it. Since houses nowadays are so airtight, a ventilation system is necessary. That results in dry air, so additional measures are required. Also, the air-source heat pump is expensive, consumes a lot of electricity or makes you dependent on electricity prices, and with all its electronics, it is quite prone to malfunctions. If it breaks down, significant replacement costs are to be expected.
Yesterday, I spoke with the site manager at the builder about this issue. We discussed this question as well. He said that he would personally build his own house without ventilation and with gas or oil heating. Now the question is: Is this still allowed nowadays under the 2016 Energy Saving Ordinance (EnEV 2016), or will the requirements force me to build such an airtight house again that I would need a ventilation system? Then there is the question of whether I would really save anything overall by switching from the air-source heat pump to gas heating, since I would need an indoor chimney again.
Is it true that if I use gas, I definitely have to install solar thermal panels on the roof, or is there still the alternative of building the house more airtight (which of course would require ventilation again)?
Thank you in advance for your advice.
Best regards,
Sony
For us, the small ventilation flap on the Velux roof window is sufficient for the lower cooking stages of the range hood. However, during searing, that is no longer enough. Then a window needs to be tilted open.
(KfW70 with ground source heat pump without ventilation system)
I would never want to give up the comfort of a powerful range hood again! Especially in an open kitchen!
(KfW70 with ground source heat pump without ventilation system)
I would never want to give up the comfort of a powerful range hood again! Especially in an open kitchen!
Perfect.
Thanks for the input.
So, a recirculating extractor fan is necessary, as you can hear.
We don’t have a proper window in the kitchen, just a roof hatch, since it’s an interior room in the attic with a flat roof.
Just so we don’t mix up the technical terms: By "wrasenabzug" do you mean a device integrated directly into the countertop next to the cooktop?
[MEDIA=YouTube]oFMmeIHZL0o[/MEDIA]
Thanks for the input.
So, a recirculating extractor fan is necessary, as you can hear.
We don’t have a proper window in the kitchen, just a roof hatch, since it’s an interior room in the attic with a flat roof.
Just so we don’t mix up the technical terms: By "wrasenabzug" do you mean a device integrated directly into the countertop next to the cooktop?
[MEDIA=YouTube]oFMmeIHZL0o[/MEDIA]
Quiet operation and strong performance are naturally important features – however, grease filtration is especially crucial in recirculation mode. It’s no use if the hood pulls in all the fumes but then blows all the grease back into the room. How much are you willing to spend, and which type of extractor do you need or prefer (downdraft, wall-mounted hood, island hood, etc.)?
Similar topics