ᐅ Air-to-water heat pump and controlled mechanical ventilation with heat recovery

Hello everyone,

I am planning to build a solid (masonry) house with KfW 70 energy standard. The external walls will be 36.5 cm (14 inches) Ytong. Approximately 230 sqm (2,475 sq ft) underfloor heating, one wood-burning stove, an air-to-water heat pump, and a controlled mechanical ventilation system with heat recovery. My question is, which heat pump would be the best solution for me? For example, the Novelan LA 14 RX (advantage: it has a cooling function), Vaillant geoTHERM, or one from Viessmann. I have read many negative experiences about the Viessmann units, but I would like to get some tips from you.

Regarding the controlled mechanical ventilation with heat recovery (central unit), has anyone had experience with PLUGGIT, or would you recommend another brand?

There will be an 8 kWp photovoltaic system installed on the roof later.

Thanks in advance

Well, this is more a matter of personal belief...

For example, Pluggit is too expensive for me...

And are there no suggestions?

As mentioned, the systems only differ minimally whether they come from manufacturer A, B, or C… they all move air from point A to point B.

The real differences are mainly in the extras, for example:

- Controls (e.g., number of pre-programmed ventilation levels)
- Enthalpy heat exchanger or a simpler heat recovery unit
- Plastic or metal ductwork
- With or without bypass
- With or without electric heating element
- Control panels, remote controls, and/or web server interfaces

Then there’s also the housing design, meaning installation options, etc.

Additionally, you can consider whether to install a ground heat exchanger or brine heat exchanger, or cooling options for the summer, and so on.

So first, it’s important to determine what features and extras you need or want, and then you can narrow down other factors… which means that manufacturers get ruled out one by one.

capkin schrieb:
and are there no suggestions?

As a combined unit: Stiebel Eltron LWZ 403.
What we have noticed: The heating system and the heating installer should be compatible. If the installer is building something like this for the first time, it can take longer and may lead to errors. Therefore: talk to the heating specialist you trust when deciding on the type. This could potentially make all the difference.

capkin schrieb:
I want to install a heat recovery system with enthalpy, as I have allergies and a healthy indoor climate is more important to me than any other building component. That’s why I wanted to know which device would be best for me.

I didn’t see earlier that you wanted an enthalpy unit. That means pumping moist air into the living spaces during winter. In some systems, the heat exchangers can simply be replaced with enthalpy exchangers.