ᐅ KfW40 house offer with heat pump and mechanical ventilation with heat recovery— is it worth it?

Created on: 25 May 2019 21:19

Hello everyone,
Today I received a house offer from a prefabricated house supplier.
They list the exhaust air heat pump Nibe F 750 with supply air module SAM 40 as the heating system. The maximum building heating load is said to be 7.5 kW.
Additionally, there is underfloor heating and a 180 L (48 gallon) domestic hot water storage tank.
The house is located near Cologne/Bonn Airport (for climate reference) and is about 120 m² (1,290 sq ft) in size (excluding the basement).

I have already read a lot of negative things about exhaust air heat pumps, so I want to ask again if this system is any good, and if not, what would be an alternative and how much more would that cost?

Thank you very much!

Lumpi_LE27 May 2019 22:19

#31

Aha.. Well, you have to know best.

querys_28 May 2019 21:08

#32

I am now receiving an updated offer including an air-to-water heat pump. Let’s see how much more expensive it will be in the end.

Zaba1229 May 2019 07:45

#33

querys_ schrieb:

I’m now getting an updated offer with an air-to-water heat pump. Let’s see how much more expensive it will be in the end.

But don’t panic when the offer arrives – it’s usually a five-figure amount. The air-to-water heat pump is actually the cheapest option because if you don’t get an all-in-one unit like a Stiebel Eltron, the mechanical ventilation with heat recovery will be an additional cost on top.

querys_29 May 2019 18:39

#34

The offer arrived today. It turns out that the mechanical ventilation system with heat recovery has now been removed.
I am being offered the Buderus Logatherm WPL 8 AR. With this unit, I can apparently receive a 2,500 euro (about 2,500 USD) BAFA subsidy (one of the few units eligible for this).
Since the mechanical ventilation system is now missing, the heating system costs about 7,000 euros (about 7,000 USD) less. Also, the 180-liter (48-gallon) domestic hot water tank is no longer listed— is it no longer needed or perhaps integrated?

By the way, the 7.5 kW building heating load refers to the heating system and represents the maximum capacity of the heater.

Zaba1229 May 2019 19:01

#35

I am not aware of any air-to-water heat pumps that are currently eligible for subsidies. The seasonal performance factors are generally too low across the board. Even the Stiebel Eltron 504, which was the only known eligible device to me two years ago, has been excluded.

Are you sure it is currently eligible, or did your general contractor just tell you that?

querys_ schrieb:

The offer arrived today. Indeed, the controlled residential ventilation system is no longer included.
I am being offered the BUDERUS Logatherm WPL 8 AR. With this unit, I can apparently receive a 2,500 Euro subsidy from BAFA (one of the few where this is still possible).
Since the controlled residential ventilation system is now missing, the heating system costs around 7,000 Euro less. Also, the 180-liter (48-gallon) domestic hot water tank is no longer included; is it unnecessary or perhaps integrated?

By the way, the 7.5 kW building heating load refers to the heating system and represents the maximum output of the heating system.

Jenpa29 May 2019 19:15

#36

On the Bafa website, eligible heating systems are listed, aren't they?

It might be that instead of using a hot water storage tank, you will now have to heat water on demand at the consumption points with instantaneous water heaters.

ᐅ KfW40 house offer with heat pump and mechanical ventilation with heat recovery— is it worth it?

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