Our four-unit building (390 sqm (4,198 sq ft)) is still looking for the right heating system to meet the city’s KfW55 requirement.
Therefore, a question about the possibility of a groundwater heat pump:
We already know that this system would likely achieve high efficiency (annual performance factor >4), so the additional cost compared to gas plus solar thermal or an air-to-water heat pump for our heating demand would likely be recovered relatively quickly (about 10–16 years). But what are the potential disadvantages that we might not yet be aware of? Is a groundwater heat pump more maintenance-intensive?
(Regarding the conditions, if anyone is interested:
According to the soil expert, a groundwater heat pump is probably feasible here (one was successfully installed 300 m (984 ft) away). To verify whether this will work, a borehole would first have to be drilled to 20 m (66 ft) to definitively assess the composition of the soil and water. This borehole would then serve as the infiltration well.
Cost for the first borehole including everything: €3500, total cost for borehole and pump in the end: €16,500. We would be investing this first amount at risk, with the possibility that we cannot install the system and would “only” have an expensive domestic water well. Hence the inquiry here.)
Therefore, a question about the possibility of a groundwater heat pump:
We already know that this system would likely achieve high efficiency (annual performance factor >4), so the additional cost compared to gas plus solar thermal or an air-to-water heat pump for our heating demand would likely be recovered relatively quickly (about 10–16 years). But what are the potential disadvantages that we might not yet be aware of? Is a groundwater heat pump more maintenance-intensive?
(Regarding the conditions, if anyone is interested:
According to the soil expert, a groundwater heat pump is probably feasible here (one was successfully installed 300 m (984 ft) away). To verify whether this will work, a borehole would first have to be drilled to 20 m (66 ft) to definitively assess the composition of the soil and water. This borehole would then serve as the infiltration well.
Cost for the first borehole including everything: €3500, total cost for borehole and pump in the end: €16,500. We would be investing this first amount at risk, with the possibility that we cannot install the system and would “only” have an expensive domestic water well. Hence the inquiry here.)
T
toxicmolotof27 May 2018 20:20In an open system, which a ground-source heat pump inevitably is, you introduce substances into the heat pump that you might not want there. This can work well for a long time, or only briefly... You probably won’t find any long-term experience reports. At the first sign that there is something in the water that is harmful to the heat pump, I would advise against it. For example, if the water is too high in iron content, it will damage the system much faster than other substances. But I’m not a specialist in that area. I can only share my experience from the Rhine region, specifically Rhein-Kreis Neuss. In cases of shallow groundwater, such a heat pump could be used. However, I was advised against it because of the unsuitable substances in the water. After filling my pool with well water, I understood why. You could have almost cast a steel beam from that water. But look, this won’t get you any further. You need a specialist for that.
L
Lückenfüller5 Oct 2018 12:12Since I always find it helpful to provide feedback after many ideas have been discussed:
The test drilling has taken place, and the lab results are in:
[Manganese] at 0.429 mg/l, which is well above the standard maximum of 0.1 mg/l
[Carbonic acid] 47 mg/l instead of 5 mg/l
According to the well builder, the system would still be feasible (he wants to get the contract, after all), but it would require regular "descaling." The heat pump manufacturer only guarantees their heat pump if an intermediate heat exchanger is installed.
This doesn’t sound very appealing to us, which is why we will probably switch to the not-so-favored air-to-water heat pump (saving about €9,000 on the well in the process).
The test drilling has taken place, and the lab results are in:
[Manganese] at 0.429 mg/l, which is well above the standard maximum of 0.1 mg/l
[Carbonic acid] 47 mg/l instead of 5 mg/l
According to the well builder, the system would still be feasible (he wants to get the contract, after all), but it would require regular "descaling." The heat pump manufacturer only guarantees their heat pump if an intermediate heat exchanger is installed.
This doesn’t sound very appealing to us, which is why we will probably switch to the not-so-favored air-to-water heat pump (saving about €9,000 on the well in the process).
Hello, I didn’t want to start a new thread.
Here’s the situation: Our plot is located in a drinking water protection zone 3 B. Now the question is whether there are specific regulations or requirements for a sewage pipe in this area. The background is that the house construction company plans to use KG2000 pipes (the green ones), which are naturally more expensive than the “standard” KG100 pipes (orange).
I can’t find any information online, and I haven’t been able to reach anyone at the authorities by phone or get a response by email.
Maybe someone has an idea or a tip.
Thanks in advance and have a relaxing Sunday
Spike
Here’s the situation: Our plot is located in a drinking water protection zone 3 B. Now the question is whether there are specific regulations or requirements for a sewage pipe in this area. The background is that the house construction company plans to use KG2000 pipes (the green ones), which are naturally more expensive than the “standard” KG100 pipes (orange).
I can’t find any information online, and I haven’t been able to reach anyone at the authorities by phone or get a response by email.
Maybe someone has an idea or a tip.
Thanks in advance and have a relaxing Sunday
Spike
H
hampshire26 Oct 2020 00:53Do some research on the topic of ice storage.
Ice storage is too expensive and complex for a single-family home. We also considered it.
A groundwater heat pump using a well was also discussed at one point.
However, there were several issues: insufficient flow rate, no approval in the water protection area, and the allowable temperature difference...
A groundwater heat pump using a well was also discussed at one point.
However, there were several issues: insufficient flow rate, no approval in the water protection area, and the allowable temperature difference...
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