Hello everyone, I am looking for an air-to-water heat pump with around 12 kW heating capacity that is also eligible for funding. I am confused about the LWDV 91-1/3 HDV 12 and HSDV 12 models from Alpha Innotec. Do they actually have a 12 kW heating capacity or not? They are basically the same as Novelan, and there is no clear information there either.
Are there any professionals in the forum who are familiar with this?
Good luck
Are there any professionals in the forum who are familiar with this?
Good luck
Make sure the underfloor heating system is designed for 30°C (86°F) supply temperature and 23°C (73°F) return temperature.
Depending on the standard temperature, you can then achieve an annual performance factor of over 4.5 and qualify for Bafa funding.
You can calculate this using an online annual performance factor calculator.
Depending on the standard temperature, you can then achieve an annual performance factor of over 4.5 and qualify for Bafa funding.
You can calculate this using an online annual performance factor calculator.
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freisinger25 Jan 2020 09:52With the above-mentioned LW heat pump, I can also achieve a seasonal performance factor of 4.5 at -14°C (7°F) standard air temperature and standard flow/return temperature. The heating engineer told me that 30/23°C (86/73°F) is not realistic.
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Daniel-Sp25 Jan 2020 10:03With such a good building envelope, this should probably not be an issue. Look for an Excel file by HFrink. With that, you can quite easily calculate the room-by-room heating load yourself and design the underfloor heating accordingly. That’s what I did and presented it to my heating engineer. The technician then followed my calculations. Now I can run all the circuits fully open (except for the bedroom) and have the desired temperature in every room.
This way, you can see what is actually possible. After that, you can better assess the heating engineer’s rough estimate.
This way, you can see what is actually possible. After that, you can better assess the heating engineer’s rough estimate.
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freisinger25 Jan 2020 10:27Great idea, I’ll do that. Thank you and everyone else for the excellent support.
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freisinger4 Feb 2020 18:43So, yesterday the heating engineer got in touch. He will not install the air-to-water heat pump because my heating load calculation is not realistic. His calculation with the high H'T value of 0.22 is realistic, while the 0.16 from the energy consultant is just theoretical. On the other hand, his hot water heat pump is also not eligible for subsidies because the storage tank is insufficiently insulated. I'm giving up.
A prime example of what is currently being discussed in another thread.
wem-die-Raumweise-heizlastberechnung-anvertrauen
The heating technician does not have enough expertise...
30/25 is definitely possible.
With the Alpha, 30/27 might even be possible depending on the refrigerant.
Another idea: With a shower drain heat recovery system, you can reduce the warm water portion of the heat pump by a few percent and possibly still qualify for a subsidy.
wem-die-Raumweise-heizlastberechnung-anvertrauen
The heating technician does not have enough expertise...
30/25 is definitely possible.
With the Alpha, 30/27 might even be possible depending on the refrigerant.
Another idea: With a shower drain heat recovery system, you can reduce the warm water portion of the heat pump by a few percent and possibly still qualify for a subsidy.
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