ᐅ Replacing an Old Heating System with a Heat Pump or Gas Boiler Combined with a Domestic Hot Water Heat Pump
Created on: 5 May 2022 10:01
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GePrest
Hello, my gas heating system (roof heating central unit) is 22 years old, as is the solar thermal system. The solar thermal system is no longer functioning properly. The first builder recommends demolishing both the heating system and the solar thermal system and installing a Weishaupt heat pump. He has been installing only Weishaupt products for several years. A second builder recommends renewing the gas boiler and additionally installing a domestic hot water heat pump. A photovoltaic system has been commissioned with 9 Luxor ECO LINE HALF-CELLS M120/380W modules, which will be expanded by at least 3 modules when the solar thermal system is removed. The property is a mid-terrace house, fully equipped with radiators, with 106 m² (1,141 sq ft) of living space, housing 4 people, and approximately 10,000 kWh annual gas consumption. Postal code 76661, average annual temperature 11.1°C (52°F), standard outdoor temperature -10°C (14°F). According to the builder, the heat pump is to be installed on the roof. Regarding the hybrid system: can I install the heat pump for domestic hot water in the basement even though there is no existing hot water pipe? How extensive would the work be if additional piping needs to be installed? Installation in the attic is not possible.
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Deliverer29 May 2022 17:13He just doesn’t want to install a heat pump because he has been installing gas systems for 30 years.
Sure, you can heat with the air conditioning system during the transition period, which accounts for about 10% of the annual heating energy. Still, you end up burning a lot of gas in winter and can only use a very small part of any surplus energy generated by your roof.
This approach makes sense in older buildings if you don’t currently have the budget for a complete heating system upgrade. And naturally, it is better than nothing.
In the end, you have to pay for and decide this yourself. But all acquaintances who installed heating systems other than heat pumps in the past 10 years keep telling me that this was probably the wrong choice. So, I honestly can’t understand how someone could even consider it, which is why I might not be much help.
I can maybe understand if you want to continue running the old system for a little longer. But switching now to a technology that should have been banned for the past 10 years (and only isn’t due to intense lobbying and consistently corrupt politicians) seems to me a serious mistake.
Sure, you can heat with the air conditioning system during the transition period, which accounts for about 10% of the annual heating energy. Still, you end up burning a lot of gas in winter and can only use a very small part of any surplus energy generated by your roof.
This approach makes sense in older buildings if you don’t currently have the budget for a complete heating system upgrade. And naturally, it is better than nothing.
In the end, you have to pay for and decide this yourself. But all acquaintances who installed heating systems other than heat pumps in the past 10 years keep telling me that this was probably the wrong choice. So, I honestly can’t understand how someone could even consider it, which is why I might not be much help.
I can maybe understand if you want to continue running the old system for a little longer. But switching now to a technology that should have been banned for the past 10 years (and only isn’t due to intense lobbying and consistently corrupt politicians) seems to me a serious mistake.
Deliverer schrieb:
He just doesn’t want to install a heat pump because he has been installing gas systems for 30 years.
Sure, during the transitional period, which accounts for about 10% of the annual heating energy, you can then heat with the air conditioning. Still, in winter you end up wasting a lot of gas AND can only use a very small portion of any energy produced from the roof.
This kind of setup is a good idea in an older building if you currently can’t afford a complete heating system replacement. And of course, it’s better than nothing.
In the end, you have to pay for it and make the decision yourself. But every acquaintance who installed a heating system other than a heat pump in the last 10 years is now complaining to me that it probably was the wrong choice. So I really don’t understand how anyone could even consider it, and that’s probably why I’m not much help.
I might understand continuing a bit longer with an existing system. But switching to a technology that should have been banned for the past 10 years (and only isn’t because of intense lobbying and consistently corrupt politicians) is, in my opinion, a serious mistake. BAFA application for a heat pump submitted but no approval yet. However, the order must be placed by 31.05 due to an upcoming price increase. What to do?
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Deliverer30 May 2022 19:08Hmm. How much is the price increase? Currently, BAFA seems to take at least about two months.
I took a risk back then and just started building. I would have needed to replace the heating system anyway…
I took a risk back then and just started building. I would have needed to replace the heating system anyway…
Deliverer schrieb:
Hmm. How much is the price increase? Currently, BAFA seems to take at least about two months.
I took a gamble back then and just started building. I would have had to replace the heating system anyway... About 5 percent, around 1500€ (~$1650). Is there a risk that the subsidy might be denied? Has that happened before? Now that I’ve decided on the heat pump, I’m still unsure because of the situation. I think I will go ahead and place the order.
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Deliverer30 May 2022 20:09In theory, there is certainly a risk. In my opinion, however, only if you have provided incorrect information or are simply not eligible for funding (house too new, heating system too new/old, address not in Germany...). I have not heard or read about any cases. But that doesn’t necessarily mean anything.
Since
Deliverer schrieb:I still have one question: Doesn’t the heat pump lose efficiency because it is installed between the two pitched roofs? The temperatures there should be lower than at ground level, right?
Theoretically, there is certainly a risk. In my opinion, though, only if you have either provided incorrect information or simply do not qualify for funding (house too new, heating system too new/old, address not in Germany...). I have not heard or read of any cases. However, that does not necessarily mean anything.
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