ᐅ Gas with solar thermal? Or heat pump with photovoltaic? Advice needed
Created on: 5 Feb 2020 08:57
M
Micha8589
Good morning to the forum,
I have been researching heating options for quite some time and have gathered a few opinions, which have only made me more uncertain about my decision. That’s why I thought I’d ask the forum.
My family (2 adults, 1 child) is planning to build the following single-family house at the end of this year or beginning of next year:
Single-family home with pitched roof
Approximately 115 m² (1,237 sq ft)
Solid construction (calcium silicate brick ground and upper floors, brick-clad)
No KFW standard
Building location: southern Mecklenburg
Unfortunately, I can’t provide an energy performance certificate or heating load calculation yet, as the preliminary offer is still being prepared. I am also aware that a general statement can’t really be made since every house and heating behavior is individual.
The construction company advised us to install a modern hybrid heating system consisting of a gas condensing boiler and two solar thermal panels on the roof for domestic hot water, as the initial costs are relatively low (plus installation of the central gas connection), and this technology has proven reliable. The entire house is planned to have underfloor heating. According to the company, they have had very positive experiences with this and consider the technology future-proof. (There is also the idea of a fireplace in the living room.)
On the other hand, I think gas prices will not get any cheaper in the future, and the topic of CO₂ taxes (especially concerning the fireplace) worries me somewhat.
In theory, I would prefer to install a geothermal heat pump combined with a suitable photovoltaic system because this would make me independent of fossil fuels and allow me to heat “off-grid” to a certain extent, depending on efficiency. However, I am hesitant because of the very high initial costs and don’t really know how these compare to operational costs. I also can no longer realistically assess which technology offers the best cost-performance ratio (except for air-source heat pumps).
As you can see, I am completely undecided and hope to get some feedback and expertise from the forum.
Thanks in advance for your replies.
I have been researching heating options for quite some time and have gathered a few opinions, which have only made me more uncertain about my decision. That’s why I thought I’d ask the forum.
My family (2 adults, 1 child) is planning to build the following single-family house at the end of this year or beginning of next year:
Single-family home with pitched roof
Approximately 115 m² (1,237 sq ft)
Solid construction (calcium silicate brick ground and upper floors, brick-clad)
No KFW standard
Building location: southern Mecklenburg
Unfortunately, I can’t provide an energy performance certificate or heating load calculation yet, as the preliminary offer is still being prepared. I am also aware that a general statement can’t really be made since every house and heating behavior is individual.
The construction company advised us to install a modern hybrid heating system consisting of a gas condensing boiler and two solar thermal panels on the roof for domestic hot water, as the initial costs are relatively low (plus installation of the central gas connection), and this technology has proven reliable. The entire house is planned to have underfloor heating. According to the company, they have had very positive experiences with this and consider the technology future-proof. (There is also the idea of a fireplace in the living room.)
On the other hand, I think gas prices will not get any cheaper in the future, and the topic of CO₂ taxes (especially concerning the fireplace) worries me somewhat.
In theory, I would prefer to install a geothermal heat pump combined with a suitable photovoltaic system because this would make me independent of fossil fuels and allow me to heat “off-grid” to a certain extent, depending on efficiency. However, I am hesitant because of the very high initial costs and don’t really know how these compare to operational costs. I also can no longer realistically assess which technology offers the best cost-performance ratio (except for air-source heat pumps).
As you can see, I am completely undecided and hope to get some feedback and expertise from the forum.
Thanks in advance for your replies.
T
T_im_Norden11 Feb 2020 14:38Now don’t let everything be drawn out of you.
Could you describe how you implemented it, which heat pump you used, and the setup of the cooling system so that others might be able to do it themselves as well?
Could you describe how you implemented it, which heat pump you used, and the setup of the cooling system so that others might be able to do it themselves as well?
P
Pinkiponk11 Feb 2020 14:45T_im_Norden schrieb:
Now don’t make me drag everything out of you. I assume Mycraft is currently at his workplace.
MayrCh schrieb:
You assume that the base price for gas will remain the same and that approximately 1.6 cents will be added. That’s your crystal ball speaking.
Mine says that something will happen with the gas price if the Russian on the other end of Nord Stream II fully opens the gas valve. Anyone can imagine what effect these additional 100 billion m³ (3.5 trillion cubic feet) of H-gas will have on the gas price.
Your entire argument apparently relies on the simplification that the electricity price consists solely of the stock market electricity price and the Renewable Energy Act surcharge. These currently account for only about 40% of the working price. You conveniently ignore the exploding grid fees and concession fees caused by the “all-electric society.” These currently make up 25% of the electricity price and, as mentioned, will skyrocket over the next few years, more than offsetting the few cents increase in the Renewable Energy Act surcharge, according to my crystal ball. I am not arguing; I’m merely repeating. You, on the other hand, argue, as you say, with your crystal ball. Hmm.
I have only conveyed the current political intention. No speculation or anything else.
In fact, I don’t believe the new pipeline will change the end consumer price at all. It saves the (expensive) transit through third countries, but they want to recover the investment quickly. And it won’t change the generation cost either.
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