Exhaust Air Heat Pump NibeF370 - Recommendation from IBG

Hello,

I am new to the forum - so thanks in advance to all the experts.
This year we are building a Kfw 70 house, living area approx./max 150 sqm.

Some time ago we were advised by IBG Haus, where a standard exhaust air heat pump Nibe F370 is used.

According to the advisor, IBG Haus purchases this system at good conditions, therefore more sensible than our previously favored system:

Gas condensing boiler with underfloor heating and solar on the roof.

IBG instead recommends the exhaust air heat pump with controlled ventilation and underfloor heating.

Therefore my questions to you:

1. Is an exhaust air heat pump economical?
2. Would our gas variant be better or more sensible?
3. Who has experience with NIBE?
4. Who has experience with this technology or better yet exactly this system?
5. Who has experience with IBG AND this technology?
6. What is the disadvantage of this technology? You always have to add electricity, right?

Note: I can recognize writers from other house construction companies and other manufacturers from 10 centimeters, so don’t bother with bashing. It’s a waste of YOUR time!

A huge thanks in advance to all real advisors!

Hello,

I am new to the forum - so first of all, many thanks to all the experts. We are building a KfW 70 house this year, living area approx./max 150 sqm. Some time ago we had a consultation from IBG Haus, where a standard exhaust air heat pump NIBE F370 is used...IBG recommends instead the exhaust air heat pump with controlled ventilation and underfloor heating.

The Nibe system technology is a renowned supplier of heat pumps and in my opinion one of the largest providers in this field. From my experience, however, the system mentioned is too small for your new building, as you probably will not manage with the conditions => heating load max. 6 kW. The 640 P would in my opinion be the better choice => heating load max. 8 kW; underfloor heating as well as controlled ventilation also additionally.

I will remain silent about the rest “”based on your specifications””

Kind regards

Thank you, you may also elaborate if you like. What exactly does the kW specification refer to?

A significant disadvantage is supposedly the auxiliary heating of the heating element in winter, which apparently costs quite a lot of money.

What do you think about this?

Hello,

....
1. Is an exhaust air heat pump economical?
2. Would our gas option be better or more sensible?
3. Who has experience with NIBE?
4. Who has experience with this technology or more precisely this system?
5. Who has experience with IBG AND this technology?
6. What is the disadvantage of this technology? Electricity always has to be added..

The exhaust air heat pump "lives," like every heat pump, from its source, in this case the exhaust air. For this, energy must first be supplied before parts of it can be recovered with more or less efficiency. Here: primarily electrical energy and significantly less solar and internal gains. In addition, air is physically a very poor "energy storage and transport medium." The exhaust air heat pump system partly comes from Sweden, where electricity costs have a different significance than in Germany. Looking at the data of exhaust air heat pumps, the fundamental imbalance between compressor power and electric heating becomes apparent. Furthermore, it is worthwhile to distinguish whether it is a pure exhaust air heat pump (F370) or an air heat pump with exhaust air utilization.
There are already some well-known nationwide general contractors who have seriously burned their fingers with such concepts. Customers sometimes have to deal with considerable electricity costs and performance deficits during peak load times. The main cause is mostly a wrong overall concept and lack of planning. For this reason, pure exhaust air heat pumps are currently available at discount prices.
It is not unusual that nationwide general contractors purchase heat generators of any kind at favorable conditions; however, this in no way justifies their special suitability for a particular construction project. This "consultant" may be a good home salesperson, but he apparently understands little about building technology.
Likewise, it is professionally incorrect at this stage to recommend a specific device/manufacturer such as the 640 P.

Best regards,

NB:
Since energy efficiency cannot contractually be agreed upon when building with nationwide general contractors/builders, an external and sales-independent sizing of heating, hot water preparation, and ventilation is always worthwhile. The resulting parameters can then be included as part of the contract. This gives the customer the highest level of security to actually receive efficient building technology.

Hello,

…What exactly does the kW specification refer to?

This figure refers to the performance that the AWP can deliver at maximum; if your new building requires more energy than 6 kW, the F 370 cannot handle this. For this reason, and because I know the "overall offer" of the competitor, I have drawn your attention to the 640 P. Provided, of course, that you are generally willing to accept the "side effects" of an AWP.

In reality, I personally do not recommend the pure AWP to any of my clients, for the reasons described by €uro. Most of my builders have installed an air-water heat pump as technology, sometimes with a simple, decentralized ventilation, sometimes as a central system with heat recovery; a few have opted for a geothermal heat pump. If they cannot warm up to any of the "latest" energy systems, I advise conventional technology. With a building envelope aimed at KfW 70 and underfloor heating, they can calmly wait and see the upcoming consumption results/suitability/lifespan of the still relatively new energy technologies today. In addition, there are already field tests with small wind turbines for house roofs; the same applies to geothermal heat pumps. There are diligent inventors working to be able to use EP even where soil conditions currently make it considerably more expensive. The coming years will certainly be exciting with regard to new technologies.

Kind regards

Hello, thank you very much for the many responses. The principle of the air-water heat pump has already been recommended to me by other happy homeowners.

Do you have links to the exact functionality?

Why are the electricity costs lower here?

Which model from which manufacturer is the most mature here?

In advance, once again, a thousand thanks.

Hello,

This key figure refers to the output that the AWP can deliver at maximum; if your new building requires more energy than 6 kW, the F 370 cannot serve this. For this reason and because I know the "overall offer" of the competitor, I have directed your attention to the 640 P. Provided, of course, that you are generally willing to accept the "side effects" of an AWP.

In reality, I personally do not recommend the pure AWP to any of my customers for the reasons described by €uro. My builders mostly have an air-water heat pump installed as technology, sometimes with simple, decentralized ventilation, sometimes as a central system with heat recovery; a few have decided on a ground-source heat pump. If they cannot warm up to any of the "latest" energy systems, I advise conventional technology. With a building envelope oriented towards KfW 70 and underfloor heating, they can calmly await the upcoming consumption results/suitability/lifespan of today’s still relatively new energy technologies. In addition, there are already field trials with small wind turbines for house roofs, the same applies to ground-source heat pumps. Here, diligent tinkers are at work to be able to use GSHP even where soil conditions currently make it considerably more expensive. The coming years will certainly be exciting regarding new technologies.

Kind regards