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
ttiggerin12 Feb 2020 13:03Mycraft schrieb:
This is usually done with evaporator units inside the house and an outdoor unit. Completely separate from the heating and ventilation systems. Because a combined unit would just be unnecessarily expensive and too large.
This way, each unit has its own function. They coordinate with each other to maintain a consistent and desired temperature and air quality throughout summer and winter, all at more or less reasonable operating and investment costs. Are you referring to fan coil units?
Right guckkuck2... just a regular air-to-air heat pump that can both heat and cool.
Commonly, people simply call this an "air conditioner." But underneath the exterior, it's just an air-to-air heat pump.
Commonly, people simply call this an "air conditioner." But underneath the exterior, it's just an air-to-air heat pump.
ttiggerin schrieb:Evaporators can be installed in a wide variety of buildings. Some manufacturers even grandly call them "comfort climate heaters." But it’s the same equipment, just packaged differently.
Are you referring to the fan coil units?
T
T_im_Norden12 Feb 2020 13:355 pages for a simple split air conditioner.
Just a simple air-to-air heat pump... this whole discussion clearly shows that hardly anyone understands how a heat pump works and what the technology actually is.
A typical air-to-water heat pump is essentially nothing more than a "split air conditioner" that heats the water in underfloor heating by extracting energy from the ground, groundwater, or air and then transfers it to the other side of the system using a medium (usually a refrigerant, e.g., R32).
This is exactly what a well-known air conditioner does as well... by extracting heat from the indoor air and releasing it back into the outside air through the outdoor unit.
A typical air-to-water heat pump is essentially nothing more than a "split air conditioner" that heats the water in underfloor heating by extracting energy from the ground, groundwater, or air and then transfers it to the other side of the system using a medium (usually a refrigerant, e.g., R32).
This is exactly what a well-known air conditioner does as well... by extracting heat from the indoor air and releasing it back into the outside air through the outdoor unit.
T
T_im_Norden12 Feb 2020 15:23And what was the point of all this?
You could have simply said you have a split air conditioning system running instead of giving the impression that you came up with some special, clever solution.
You could have simply said you have a split air conditioning system running instead of giving the impression that you came up with some special, clever solution.
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