ᐅ BAFA Innovation Grant for Air Source Heat Pumps

gnika77 schrieb:
NAT, supply temperature, heating limit temperature, and heat pump model, then I can tell you what you could have done differently, if at all...

- Supply temperature: 35°C (95°F), return temperature: 28°C (82°F)
- Heat pump: Kermi x-change dynamic 8 AW E
- Heating limit temperature: 12°C (54°F) (new build)
- Standard outdoor temperature: -14°C (7°F)

Grantlhaua schrieb:

That is not quite correct. Of course, there are applications where a stratified storage tank makes sense.

I can’t think of any in connection with a heat pump, but if one is installed, it should be hydraulically integrated correctly. Unfortunately, this is rarely the case.
Now I’m curious about the useful applications regarding heat pumps—especially for stratified storage tanks.

Regards, Nika

Grantlhaua schrieb:
- Flow temperature: 35°C (95°F) Return temperature: 28°C (82°F)
- Heat pump Kermi x-change dynamic 8 AW E
- Heating limit temperature 12°C (54°F) (new build)
- Standard outdoor temperature -14°C (7°F)

The key oversight in this case is designing for a flow temperature of 35°C (95°F).
Efficient operation of a heat pump requires the flow temperature to be as low as possible. In new builds, this can be easily achieved at a low cost by keeping it under 30°C (86°F). Ground-coupled heat exchangers and/or wall heating in the bathroom may already be sufficient for this. Otherwise, adjusting the pipe spacing can help reduce it significantly.

1. If still possible, it could be checked whether an additional wall heating system in the bathroom is feasible.

2. If the house is not well insulated and the heating demand is correspondingly high, the hot water share in the calculation could possibly be reduced.

3. With a large window area, the heating limit temperature used in calculating the seasonal performance factor (SPF) could potentially be set higher.

4. The Kermi unit seems decent. However, there are better options, such as the Nibe F2120 or IDM iPump. The former can be purchased significantly cheaper in Sweden. Subsidies are still available then.

Regards, Nika

gnika77 schrieb:
I can’t think of any examples related to heat pumps, but if one is installed, it should be hydraulically integrated correctly. Unfortunately, that is rarely the case.
Now I’m curious about the practical applications in connection with heat pumps, especially with a stratified storage tank.

Regards, Nika

For example, combined with a solar thermal system. Also, with a larger photovoltaic system, the storage tank can serve as an additional energy buffer when no battery is available.

gnika77 schrieb:
4. The Kermi unit seems decent, but there are better options, such as the Nibe F2120 or IDM iPump. The first one can also be ordered significantly cheaper in Sweden. Subsidies are available regardless.

An alternative would have been the IDM, but I’m getting the Kermi at a very good price.

gnika77 schrieb:
1. If still possible, one could check whether an additional water heater could be installed in the bathroom.

We can manage that, but then you need an SJAZ calculation, right? Where can you get that from?

I am currently researching this topic as well.

Just as a note:

Wording on the BAFA website:
The innovation funding can only be applied for heat pumps with high seasonal performance factors OR heat pumps with improved system efficiency. The specific requirements depend on the type of heat pump.

From the posts, I understand that an air-to-water heat pump hardly reaches a seasonal performance factor of 4.5.
However, it might qualify under the OR category of the funding for "system efficiency" and therefore be eligible for support.

Or am I mistaken here?

rbommes schrieb:
I am currently researching this topic as well.

Just a note:

The wording on the BAFA website:
The innovation grant can only be applied for heat pumps with high annual performance factors OR heat pumps with improved system efficiency. The specific requirements can be found in the respective type of heat pump.

From the posts, I gather that an air-to-water heat pump hardly ever reaches an annual performance factor of 4.5.
However, it might qualify under the OR category of the grant for "system efficiency" and thus be eligible.

Or am I mistaken here?

That’s how I understand it too, but for that, you would need a system efficiency calculation, right?