Hello everyone!
We are currently considering what and how we want to build. It’s about a new build that will be constructed by a developer. At the moment, a 36cm (14 inch) Ytong exterior wall is being offered. I would like to replace the standard heating system—a gas burner with radiators—with a heat pump and underfloor heating throughout the house, completely eliminating the need for a gas connection.
I don’t really want to use an air-source heat pump because I don’t want the noise or the unit in the garden, and I’m not thrilled about the decreasing efficiency during the cold season.
However, I have a few questions about the design and implementation. First, I have no idea how much more expensive ground source heat pumps are compared to air-source heat pumps. Do you have any rough estimates? I would prefer to use ground probes, meaning boreholes, since I consider that the most reliable method.
But what happens if there is damage to the system? A technician can simply open up and repair an air-source heat pump. However, no one would want to dig up the ground probes, right?
Also, how much space is needed for something like this? I was thinking the boreholes could be made in front of the house—that is, between the house and the sidewalk. There’s only about 3–5 meters (10–16 feet) of space there. If someone needs to access the pipes, you would have to remove the paving. I won’t be able to bring in heavy machinery to the garden later on.
To increase the efficiency of the system in the long run, I would also like to add photovoltaic panels later, but that would have to wait a few years due to cost and planning reasons.
Thank you for your help!
We are currently considering what and how we want to build. It’s about a new build that will be constructed by a developer. At the moment, a 36cm (14 inch) Ytong exterior wall is being offered. I would like to replace the standard heating system—a gas burner with radiators—with a heat pump and underfloor heating throughout the house, completely eliminating the need for a gas connection.
I don’t really want to use an air-source heat pump because I don’t want the noise or the unit in the garden, and I’m not thrilled about the decreasing efficiency during the cold season.
However, I have a few questions about the design and implementation. First, I have no idea how much more expensive ground source heat pumps are compared to air-source heat pumps. Do you have any rough estimates? I would prefer to use ground probes, meaning boreholes, since I consider that the most reliable method.
But what happens if there is damage to the system? A technician can simply open up and repair an air-source heat pump. However, no one would want to dig up the ground probes, right?
Also, how much space is needed for something like this? I was thinking the boreholes could be made in front of the house—that is, between the house and the sidewalk. There’s only about 3–5 meters (10–16 feet) of space there. If someone needs to access the pipes, you would have to remove the paving. I won’t be able to bring in heavy machinery to the garden later on.
To increase the efficiency of the system in the long run, I would also like to add photovoltaic panels later, but that would have to wait a few years due to cost and planning reasons.
Thank you for your help!
Bauexperte schrieb:
I also think that gas condensing boilers will face more challenges starting in 2016 (my personal opinion).Could you please clarify that a bit?
B
Bauexperte22 Jul 2015 10:58Schrimp schrieb:
Can you clarify that a bit? The improvement of the primary energy factor for electricity reflects the expansion of renewable energy sources in Germany. As a result, the primary energy factor is reduced from 2.4 to 1.8. This means, conversely, that starting in 2016 it became even easier to qualify for funding (KfW) using an air-to-water heat pump as the heat source for a single-family home compared to a gas condensing boiler.
Regards, Bauexperte
Ah, I see... Well, I have to admit that I am definitely interested in more environmentally friendly options, but it has to make financial sense.
At the moment, I am looking at additional costs of around 15,000 euros (about $16,000) for geothermal heating compared to a gas boiler... I am ruling out air source heat pumps because, in my opinion, they are not a practical technical solution. I’m starting to doubt whether I can recover the 15,000 euros (about $16,000) over a reasonable period of time, even if gas prices rise (which I do expect).
At the moment, I am looking at additional costs of around 15,000 euros (about $16,000) for geothermal heating compared to a gas boiler... I am ruling out air source heat pumps because, in my opinion, they are not a practical technical solution. I’m starting to doubt whether I can recover the 15,000 euros (about $16,000) over a reasonable period of time, even if gas prices rise (which I do expect).
S
Sebastian7922 Jul 2015 12:05Remember the BAFA subsidy of 4500 euros (approx. $4850).
B
Bauexperte22 Jul 2015 12:20Schrimp schrieb:
I rule out air source heat, as in my opinion it is not a practical technical solution. Actually, it is, if you want to build a true Passive House (PH). The alternative is an air-to-water heat pump. We have been installing these for years; it should be offered at a price comparable to a gas condensing boiler with solar domestic hot water heating.
Regards, Bauexperte
Bauexperte schrieb:
The alternative is an air-to-water heat pump. We have been installing these for years; they should be offered at a similar price to a gas condensing boiler with solar thermal water heating.
Regards, BauexperteReally? Most general contractors I've spoken to told me something quite different… usually they have gas systems installed and want an extra charge for an air-to-water heat pump. At least the ones I talked to.
But maybe solar was not included in their quotes…
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