ᐅ Combined ventilation and heat pump system or separate units

Hello everyone,

We are building a single-family house with Poroton 36.5 blocks filled with zeolite, about 180 sqm (1,937 sq ft) with a basement. We plan to install a heat pump and want to have a ventilation system as well.

The electrician recommends a combined unit that includes both ventilation and heat pump.

The heating engineer doesn’t see any advantage in that.

The electrician suggested Stiebel; apparently, they won an innovation award for the combined unit.

The heating engineer isn’t very confident in that company.

So now we’re stuck, with each professional recommending something different.

What are your experiences? What are the pros and cons of a combined unit? Which company would you recommend?

Are combined units only available as indoor installations? So far, we have always planned for outdoor installation.

Thanks for your tips, we’re a bit puzzled right now...

Best regards

Hello, what type of heat pump do you plan to install: a ground source heat pump or an air-to-water heat pump? The combined units I know are usually air-to-air heat pumps.

Hello!
We have a Tecalor THZ 504, identical to the Stiebel Eltron LWZ 504.
The unit is a combination device with controlled residential ventilation and heat recovery. It is installed in the basement and has been working very well so far. The installation site is in Baden-Württemberg at about 950 m (3,117 ft) above sea level.

We have a combined unit (air-to-water heat pump) from Stiebel. The Innovation Award suggests it is a heat pump with an inverter, probably the 504 model. If you take care of the sound insulation, the unit performs well; so far, it has been working efficiently and quietly.

What does your kitchen installer say about this?

Go with what your heating engineer recommends. By the way, they don’t tell the electrician which circuit breakers to use. The heating engineer also has to operate the system later on.

It will be an air-source heat pump.

We will definitely tend to follow the heating engineer’s advice. It’s just confusing when you receive different recommendations. He only mentioned that he’s not very impressed with the company Stiebel; otherwise, he didn’t have any particular objections to combined units.

Thanks for your tips. We will be meeting with the heating engineer tomorrow.

Is there a real advantage between separate units and a combined unit?

With the combined unit, we already have concerns about space requirements since the air-source heat pump would also be installed in the basement. The air pump was originally planned to be placed outside the house.

Best regards