Integral device Stibel Eltron LWZ 504 with central supply air

There is also a THZ504 with us and in the basement. Next week we will start the drying program for our screed. We have decided on the performance. The house has a WF of 160m2, KfW55. Since we live at around 950m, there is often snow here. Our house builder installs only THZ with ventilation in the house.

For our KfW55 house, I am also planning this system. Can someone tell me how much more expensive the combined unit is overall compared to if I get heating and ventilation separately from Zehnder (ventilation system) and Viessmann (air-water heat pump)? Unfortunately, I cannot yet classify it in terms of price.

so guys I no longer plan and I do not quote any brochures and I do not guess, I have xx living space. etc...

I have the LWZ504!
- the living space does not matter, the entire volume of the house counts, because the entire air in all rooms is circulated
- I am currently disappointed with the LWZ 504:
1. Ventilation OK house volume approx. 650m³ (145m² living space) (levels 1: 150m³/h, 2: 170, 3: 240)
Air noise from 180 m³/h - occurs in the air distributor - but it is OK, since this large air volume is only needed for party mode and there the background noise of the guests is louder than the system
2. Heat / heating OK
3. Hot water OK
4. Noise next to the device OK (located in the basement - door to the house is closed)
5. Noise over the pipe system of the ventilation - especially with domestic / heating water demand - is partially outrageous!
Well, a city dweller or hard of hearing person might not hear that, here in the countryside it is very unpleasant!
During the day one could tolerate it, since the ambient noise is higher anyway. In the evening and at night I am disappointed.
When the thing rattles it's over with the peace!

Discuss this with your heating engineer and Stiebel customer service....

Yes in summer you get the hot air inside, so summer cassette and ventilation off during the day.

In the transition period when you have several visitors the room heats up strongly due to the heat recovery of the exhaust air (without heating). Shock ventilation is unfortunately unavoidable! (you quickly bring flying pests into the house this way)

I could imagine that a separate system for ventilation and hot water production would not cause this noise disturbance in the house!

In winter when neighbors heat fossil or with solid fuels / neighbors, you suck in the exhaust gases directly at floor level and actively smoke yourself out.
There is a lack of detection of intake air quality here....

That sounds bad. Apparently a problem with the integrated device, causing vibrations/sound to be "distributed" throughout the entire duct system. I am however surprised by the sizing of the device. A normal air exchange rate for your building volume is already above level 3. The device runs at its limit and is accordingly loud. Activated carbon filters help against odors from outside. And a hint to the neighbor on how to properly heat chimneys.

Hello! We have now moved in and have the same model THZ504. Level 1 is 170m3/h Level 2 is 230m3/h Level 3 is 310m3/h At level 1 you hear nothing. At level 2 you can hear a "rustling" in the bathroom, for example, this is the exhaust air. In the house we have 4 exhaust openings and 10x supply air. Between the THZ and the ventilation system there is a large silencer or 2 pieces, one for supply and one for exhaust air. When the device is operating, for example during hot water preparation, we hear nothing in the house. The device is located in the (concrete) basement.

a large silencer or 2 pieces, one for supply and exhaust air. When the device is working, e.g. during hot water preparation, we don't hear anything in the house. The device is located in the (concrete) basement.

The problem could be with the silencers, are they too small? During normal ventilation, we hear the same as blackm88. When heating, etc., you can hear slightly more. It is very quietly noticeable, but not disturbing for us. And it is already very quiet here at night. The problem with odors from outside is actually experienced by everyone we know with controlled residential ventilation; unfortunately, none of the installed systems monitor air quality. Stiebel offers a box in which activated carbon filters can be placed. LWF FBF 160 or something like that is the designation. Or, for example, has implemented such an air quality sensor via KNX and a normal controlled residential ventilation and then switches off the system.