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_im_Norden schrieb:
Electricity will not get cheaper, that is clear.Considering the current political intentions, yes, it will, and quite noticeably.
Please do not assume household electricity but look at electricity for heat pumps.
Whether all of this will actually happen remains to be seen.
T
T_im_Norden11 Feb 2020 08:34Heat pump tariff is around 23 cents.
All the studies I have read so far assume that electricity prices will increase.
This is logical, as consumption is expected to rise.
All the studies I have read so far assume that electricity prices will increase.
This is logical, as consumption is expected to rise.
T_im_Norden schrieb:
It makes sense that consumption will increase.This logic only holds if you assume a (too) limited supply. From what I understand, there is actually a massive oversupply, and Germany currently has a large export surplus as well.
Moreover, the gas that enters a building can also be used in a gas turbine. That’s the advantage of electricity—it can be generated from many sources, ranging from oil to wind power. The producers compete with each other, which I find positive.
What has consistently become more expensive are the fees and charges, not the generation costs. The Renewable Energy Act surcharge and transit fees are rising due to the energy transition.
T
T_im_Norden11 Feb 2020 08:58Basically correct.
It's probably related to the total investment amount and the length of use.
Everyone wants to do everything right and perfectly.
It's like with tiles; planning takes months, but after 5 years, due to changed tastes, everything is considered ugly.
It's probably related to the total investment amount and the length of use.
Everyone wants to do everything right and perfectly.
It's like with tiles; planning takes months, but after 5 years, due to changed tastes, everything is considered ugly.
Lumpi_LE schrieb:
Heating costs in a new build are basically irrelevant anyway.. why stress or even worry about them?
You could rather complain about holiday expenses, which increase every year by about the same amount as annual heating costs. Do you know the difference between consumption and investment?
We are also not in the expensive vacation forum. That’s why we’re discussing this here.
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