ᐅ Which heating system should be used, and how can it be combined with photovoltaic or solar thermal panels?
Created on: 28 Jan 2022 22:28
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Elias_dee
Hello!
I have been researching heating options for the new build of our single-family house for weeks and still haven’t found a definitive opinion on the topic.
We are building a “standard” house, roughly equivalent to a KFW55 standard home, but without any subsidies or incentives—the hassle isn’t worth it. The house will be built on a sloped site, with the roof facing south. The local development plan expressly encourages photovoltaic / solar thermal systems (a separate roof covering is allowed).
A gas connection is already available on the plot. I originally didn’t want a gas heating system, but now I’m a bit uncertain. Both of my immediate neighbors in this new development area are using gas combined with solar thermal.
I was actually interested in geothermal heating. However, according to a local heating contractor, drilling is limited to 50 meters, so it’s not worth it here.
Then I looked into horizontal ground collectors such as trench or surface collectors. But that option is now off the table, because many say you can hardly plant anything on top of them (and we are really passionate gardeners).
So essentially, the options left are a) gas (though I’m not really a fan of fossil fuels), or — and this is currently my favorite — b) an air-source heat pump. The heating contractor I prefer locally installs the Wolf CHA Monoblock system, but I haven’t found many user reviews, it seems fairly new but also quite quiet.
Would you also choose an air-to-water heat pump in this situation?
Then comes the next question: how to combine it? With solar thermal or photovoltaic? Or even both? There are hundreds of forums and articles on this, and I’ve read a lot, but in the end, I’m only more confused because everyone says something different.
What do you think?
Regards,
Elias
I have been researching heating options for the new build of our single-family house for weeks and still haven’t found a definitive opinion on the topic.
We are building a “standard” house, roughly equivalent to a KFW55 standard home, but without any subsidies or incentives—the hassle isn’t worth it. The house will be built on a sloped site, with the roof facing south. The local development plan expressly encourages photovoltaic / solar thermal systems (a separate roof covering is allowed).
A gas connection is already available on the plot. I originally didn’t want a gas heating system, but now I’m a bit uncertain. Both of my immediate neighbors in this new development area are using gas combined with solar thermal.
I was actually interested in geothermal heating. However, according to a local heating contractor, drilling is limited to 50 meters, so it’s not worth it here.
Then I looked into horizontal ground collectors such as trench or surface collectors. But that option is now off the table, because many say you can hardly plant anything on top of them (and we are really passionate gardeners).
So essentially, the options left are a) gas (though I’m not really a fan of fossil fuels), or — and this is currently my favorite — b) an air-source heat pump. The heating contractor I prefer locally installs the Wolf CHA Monoblock system, but I haven’t found many user reviews, it seems fairly new but also quite quiet.
Would you also choose an air-to-water heat pump in this situation?
Then comes the next question: how to combine it? With solar thermal or photovoltaic? Or even both? There are hundreds of forums and articles on this, and I’ve read a lot, but in the end, I’m only more confused because everyone says something different.
What do you think?
Regards,
Elias
E
Elias_dee29 Jan 2022 09:19CC35BS38 schrieb:
No. They are still too expensive to be worthwhile. You can install them later if it makes financial sense. Currently, however, they are too costly. Okay! Maybe a subsidy program will be introduced for this in the near future...
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Deliverer29 Jan 2022 10:31Gas must be phased out completely within the next 15 years. I wouldn’t start using it now.
Regarding Wolf: As far as I know, the manufacturer has currently put the 4 kW model on hold. This means only the 7 and 10 kW versions are available at the moment. Although these are very good, they are significantly oversized for a new build. Make sure to get a current model with a heating capacity that matches your house.
Regarding Wolf: As far as I know, the manufacturer has currently put the 4 kW model on hold. This means only the 7 and 10 kW versions are available at the moment. Although these are very good, they are significantly oversized for a new build. Make sure to get a current model with a heating capacity that matches your house.
@Deliverer I haven’t reviewed the OP’s full history, but I haven’t seen anything in this thread about heat load calculation, region, or house size. Therefore, I wouldn’t say that 7 kW is too large. Especially since I believe we’re talking about a modulating system.
A 120 m² (1,292 ft²) house without a basement on the Mosel is quite different from 160 m² (1,722 ft²) plus a heated basement in the Allgäu.
A 120 m² (1,292 ft²) house without a basement on the Mosel is quite different from 160 m² (1,722 ft²) plus a heated basement in the Allgäu.
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Deliverer29 Jan 2022 11:12A new building that requires 7 kW heating capacity, in my opinion, is essentially a newly built old house. And in the eyes of our lawmakers, in my opinion, it is no longer permitted. Therefore, I would bet that the heating load is somewhere between 3 and 5 kW. Without knowing more about the house.
That it is certainly possible to use the CHA 7 in such a house and that it probably delivers quite decent results is, of course, also true. It just costs more.
That it is certainly possible to use the CHA 7 in such a house and that it probably delivers quite decent results is, of course, also true. It just costs more.
Deliverer schrieb:
In my opinion, a new building that requires 7 kW of heating capacity is basically a newly built older house. And in the eyes of our regulators, I believe it’s no longer permitted. Therefore, I would bet that the heating load is actually somewhere between 3 and 5 kW, without knowing more about the house.
It’s true, of course, that the CHA 7 can definitely be used in such a house and will probably deliver decent results. It just costs more.Well, I don’t really know either. You seem to be ignoring the basic conditions. If you follow the magenta-colored forum, there are plenty of single-family homes built to KfW 55 standard that, due to volume and location, end up with a heating load between 5 and 7 kW (according to Trenchplanner). This has nothing to do with old or existing buildings. The original poster is aiming for something like KfW 55, or maybe even less efficient.
That’s not the main topic here, but especially now that subsidies have ended, it often doesn’t make economic sense to put in extra effort.
First, I would recommend getting a proper plan done. That means, if necessary, paying a few hundred euros to hire a building services engineer (mechanical, electrical, and plumbing planner). See what results that produces, and then make a decision based on that.
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