Hey everyone,
We are currently planning our small house and are facing the big question of which type of heating system to choose.
Gas heating + domestic hot water
Heat pump (air-to-water)
Geothermal energy
I have researched the different types extensively. It is also clear that the initial investment costs vary.
Which heating system is the most cost-effective in terms of operating expenses?
Here are a few key details:
KfW-55 standard
About 140m² (1,500 sq ft)
Controlled ventilation system
Underfloor heating on ground floor and upper floor
Thank you very much for your advice
We are currently planning our small house and are facing the big question of which type of heating system to choose.
Gas heating + domestic hot water
Heat pump (air-to-water)
Geothermal energy
I have researched the different types extensively. It is also clear that the initial investment costs vary.
Which heating system is the most cost-effective in terms of operating expenses?
Here are a few key details:
KfW-55 standard
About 140m² (1,500 sq ft)
Controlled ventilation system
Underfloor heating on ground floor and upper floor
Thank you very much for your advice
Sascha aus H23 Feb 2017 09:03Climbee schrieb:
Friends of mine also built a house that essentially meets the KfW55 standard, but because they have a gas boiler (and mechanical ventilation with heat recovery), they only received KfW70 certification, with a note regarding the use of fossil fuels... This issue does not apply to us. The KfW energy consultant approved the house based on the planning stage, and all KfW applications have been approved.
B
Bieber081523 Feb 2017 09:42Climbee schrieb:
Friends of mine also built a house that essentially meets the KfW55 standard, but since they have a gas boiler (and a controlled ventilation system with heat recovery), they only received KfW70 certification due to the use of fossil fuel. You can see this is also a political issue! In the end, politicians decide what counts as renewable energy, what gets subsidies, and what doesn’t. That’s perfectly fine, but it’s important to be aware of. You should weigh your own decisions accordingly and not rely solely on the KfW rating label.
Bieber0815 schrieb:
You can see, this is political too! In the end, politicians decide what counts as renewable energy, what gets subsidies, and what doesn’t. That’s perfectly fine, but you should be aware of it. Then you can weigh your own decision and not just focus on the KfW label or similar.Exactly! It’s driven purely by politics and lobbyists. At the end of the day, what matters is what it really costs you in the end. Energy certificates aside. Whether it’s A or A+ – who cares??? It’s mostly just window dressing. The important thing is not to be misled by that and to invest in things you won’t be able to change later: insulation and masonry. You can always replace technology, though it takes effort. But you won’t be tearing down the walls.
The Austrians do it better... they even build with 50cm (20 inches) bricks... 38cm (15 inches) is their smallest size. For a long time, 30cm (12 inches) bricks were still standard here.
Bieber0815 schrieb:
With geothermal heat, there is no visible outdoor unit (just like with gas). If gas is ultimately cheaper to install than an air-to-water heat pump, I would choose gas.There are also air-to-water heat pumps without an outdoor unit. For example, the Stiebel Eltron LWZ305.
C
Cruiseaddict24 Feb 2017 19:48We were also faced with the decision and chose an air-to-water heat pump.
A gas condensing boiler was completely ruled out for us. Our builder would have only installed one with a high flow temperature, which would have made the underfloor heating unsuitable for heat pumps.
Since we need to finance our project, we decided on the heat pump with lower initial costs, namely the air-to-water heat pump.
According to our calculations, the savings in operating costs with a ground source heat pump would not have been enough to cover the higher investment.
A gas condensing boiler was completely ruled out for us. Our builder would have only installed one with a high flow temperature, which would have made the underfloor heating unsuitable for heat pumps.
Since we need to finance our project, we decided on the heat pump with lower initial costs, namely the air-to-water heat pump.
According to our calculations, the savings in operating costs with a ground source heat pump would not have been enough to cover the higher investment.
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