Comfort climate heating: pros and cons??

hello, I am not allowed to have underfloor heating in the house for health reasons and now we have come across the Wohlfühl-Klima-Heizung through a prefab house exhibition, which works without underfloor heating and without annoying radiators. We were actually very enthusiastic, but when I read all the posts here, I am starting to have doubts. The plan is a Kfw70 house, with 140 m² of living space Near Ulm Are there also builders who are enthusiastic about this heating system? Who has had negative experiences? Is the system sufficient or would a wood stove definitely be recommended in addition? Questions upon questions and thank you for your help

Do you mean air-to-air heat pump? Very well insulated houses might work with that...

hello, I am not allowed to have underfloor heating in the house for health reasons and now we came across the comfort climate heating system at a prefabricated house exhibition, which works without underfloor heating and without annoying radiators. We were actually very enthusiastic, but after reading all the posts here, I am starting to have doubts.

The plan is a KfW70 house, with 140 m² living space Near Ulm

Are there also homeowners who are enthusiastic about this heating system? Who has had negative experiences? Is the system sufficient or would a wood stove definitely be recommended in addition?

Questions upon questions and thanks for your help

The prefabricated house supplier Bien-Z. has been doing this for many years. So it probably can't be that bad.

Well, it gets warm - but at a price I wouldn't pay

hello, I am not allowed to have underfloor heating in the house for health reasons and now we came across the comfort climate heating at a prefabricated house exhibition, which works without underfloor heating and without annoying radiators. We were actually very enthusiastic, but when I read all the posts here, I am starting to doubt. Planned is a KfW70 house, with 140 m² living space Near Ulm Are there also builders who are enthusiastic about this heating system? Who has had negative experiences? Is the system sufficient or would a wood stove definitely be recommended in addition? Questions upon questions and thanks for your help

Hello to my hometown! You were probably at the exhibition in Friedrichsau, I suppose. Well, straight away: You cannot build a KFW-70 house anymore in 2016 because it no longer exists – for that, you would have had to submit the building application by 31.12.2015. The new energy saving regulation house is about +/- 5% on values like the former KFW-70. Many manufacturers of timber-frame houses ("prefab houses") will probably now offer either the 100% house or Kfw55 preferentially. There are also KFW-40 and KFW-40-Plus. This will gradually become more and more expensive; the savings on heating costs are comparatively low, but the investment is high. Regarding your choice of heating system: Right away, we also do not have underfloor heating; my wife can’t tolerate it, and I don’t like underfloor heating. We have normal radiators, which in a KFW-70 house like ours are not very large. And they can be installed so that they do not disturb, although one might find the look disturbing. Depending on which manufacturer you have in mind: The energy saving regulation / KfW is now mainly (not exclusively, the following is a simplified representation of complicated factors) determined by the primary energy demand Q_p and the transmission heat loss H_t. Roughly speaking, one can combine a very well insulated house with a heating system that has a comparatively high Q_p value (gas/oil). Or any other mixed form, i.e., a "less well" insulated house with a comparably high H_t value with a heating system that is better in terms of Q_p. Heat pumps generally have a good Q_p value because the primary energy factor of electricity has now dropped to only 1.8 accordingly. The lowest Q_p value is usually with a wood pellet heating system. The heating system you mentioned is very probably an air-to-air heat pump. One may debate whether that is an optimal system. I don’t think so, but that’s irrelevant. What you have to pay attention to is: What is the heating energy demand of the chosen house (per room)? Then it must be precisely calculated (by the manufacturer) whether the planned heating system, in this case an air-to-air heat pump, can handle that economically (annual performance factor, investment costs). Ulm / Alb is at a higher altitude; it is often cold, foggy, and unpleasant longer. I would have alternatives calculated and determine the total cost of ownership! In other words: The envelope/build form/insulation of the house determines whether the air-to-air heat pump makes sense. Not the KFW-55,40,… certification. A good manufacturer knows this and will advise you accordingly and perform the calculations. Don’t buy something where it’s not 100% clear whether the heating system fits the house. As I said: The statement can be clearly proven by calculation; there are programs for that. Best regards Thorsten

Addendum: The question of the wood stove does not arise. Because that is a feel-good item, not suitable for heating the entire house. Even a proper fireplace is usually not enough for that.

The problem is rather that an improperly adjusted L-L heat pump operates in the inefficient range and cannot heat rooms, especially bathrooms, adequately or only at high costs.

And with ddusselig above - that was my Apple’s fault, I wanted to write "dusselig".