Air-to-water heat pump single-family house with basement - 150m² living area

Hello everyone,

we are currently in the planning/decision-making phase and need to choose a company. Now to the topic: Air-to-water heat pump

Unfortunately, the general contractors are not sufficiently aware and can hardly answer detailed questions here. I will also soon sit down with a heating installer and get advice on this.

Nevertheless, the two companies offer 2 different models included. For a comparison, the questions naturally arise for me:

1. Are both air-to-water heat pumps eligible for BAFA funding?
2. Which air-to-water heat pump is fundamentally better suited for our single-family house?
3. Which value approach of the pumps should be set higher, since I naturally have to bring both offers to the same level.

The following models were offered to me:

Viessmann Vitocal 200-S and the Viessmann Vitocal 300-A (AWO-AC 301.B)

I am thankful for any information!!

Regarding 1: There is a list at Bafa, online, where all eligible pumps are listed.

1. This cannot be answered like that, it must be calculated individually for each model. Search online for annual performance factor calculator BAFA funding. 2. This cannot be answered like that, as no values about your house are known and there are different power models/versions. However, there is a bit of "oversizing" in the air. 3. What do you mean by value assumption? What can be said is that there are two different variants. One is split, the other monoblock. Research the difference. Is there already a room-by-room heating load calculation, otherwise the offer is useless and more of an estimate.

Regarding point 1: there is a list at Bafa, online, which lists all eligible pumps.

Correct, but keep in mind, that does not necessarily mean it is eligible for funding in each individual case.

Regarding 2., the answer is probably: It depends

Regarding point 2, the answer is probably: It depends

No heating load or similar has been calculated yet, so this is definitely an estimate.

Therefore, the question is whether the price difference between the two pumps can already be determined?
I strongly suspect that the 300-A is generally more expensive than the 200-S. Thus, the value estimate for the air-water heat pump is higher at company x than at company y.

How is a heating load determined? Can this be done based on the floor plan?