Combination of central and decentralized ventilation

Hello,

At the moment, our house is equipped with a heat pump heating system that draws its energy from the exhaust air of the ventilation system (the device is from Stiebl Eltron). Since the system is defective, we want to replace the heating. A split air heat pump supported by solar thermal energy is to be installed.

However, the problem lies with the ventilation system. There are 4 exhaust vents (kitchen, guest WC, bathroom, and hallway). The 6 air inlets are directly through the wall. So the air is not preheated. This is particularly unpleasant in the living room. And energetically, I find this rather poor, especially when -10°C cold air enters in winter.

Now my question: Are there systems that allow both the use of exhaust air and preheat the air before it is admitted? How does this look in terms of energy efficiency? It would be basically a mix of central and decentralized ventilation...

Thank you very much for the help

Sounds illogical - warming up external supply air - that sounds like the desire for a pure air heating system (electric, of course). Because ventilating the entire house through the kitchen or bathroom is certainly not desired. It would be more sensible to do without the exhaust air ducts and instead install a decentralized ventilation system with heat recovery. Although the example I know does not necessarily convince me. Principle: on one side, air is extracted, a heat storage unit is charged with the exhaust air, and after time x the ventilation direction is reversed, and the heat is returned to the incoming air. On the other side of the building, of course, a second device must participate.

Would it be possible to retrofit a purely central system? That would be the more interesting solution...

Hello,

I know it sounds illogical. I haven't found a suitable solution so far. That's why I'm writing in the forum.

I definitely don't want a pure air heating system. I have only found the solutions already mentioned. For a central unit, supply air ducts would have to be installed in all rooms, which would be much too complicated for me.

If I may ask, which decentralized device is it? And if so, what is the dissatisfaction with it?

Search for Ventomaxx heat recovery ventilation or SEVentilation or inventer. These are decentralized ventilation systems with heat recovery. Suitable for wall installation.

Search for Ventomaxx heat recovery ventilation or for SEVentilation or for inventer. These are decentralized ventilation systems with heat recovery. Suitable for wall installation.

There is also Lunos e2

Perhaps one could also use Meltem heat recovery units, directly at the existing fresh air openings. Advantage over Lunos etc: No pendulum operation!