ᐅ Geothermal heating and domestic hot water: horizontal ground collector or deep borehole?

Hello!

We are currently planning to build a house, and part of that includes finding the right heating system. Recently, we visited an installer nearby who recommended a geothermal heat pump. We are planning a bungalow of about 120 m² (1,292 ft²) with mechanical ventilation to achieve a nearly zero-energy building standard.

Our installer suggested a KNV heat pump with direct expansion and a ground collector. The system should provide heating for both the house and domestic hot water.

Which brand would you recommend? Should we use a ground collector (how many m²?) or opt for a deep borehole (how deep?) instead?

I noticed that KNV and Ochsner use the refrigerant R407c, while Heliotherm uses R410A. Is there a difference between these?

I also saw that there are modulating heat pumps. Are these preferable, and if so, why?

Lastly, does anyone know the approximate cost of these brands? I wasn’t able to find prices online for Heliotherm and Ochsner.

Best regards
Daniel

The topic is very complex and cannot be separated from the overall house package. I would always recommend doing independent research as well.

Best regards

Hello,

regarding geoJETTING. I had not heard of it until now.
Do they offer this service in Austria as well? Where can you find a company that provides this?

Oops, I didn’t expect Austria, so I have to pass on that.

Hello,

We recently moved into a KfW 60 energy-efficient house with a geothermal heat pump (deep drilling) and a controlled ventilation system with heat recovery.

The heat pump itself is a Waterkotte AI1, which can even provide cooling in summer. Two of my colleagues have had this system for several years and are very satisfied with it. So far, I have only heard positive things about it.

The depth of the drilling depends on the living area and the insulation of the house. This is calculated based on these parameters.

I hope this helps you.

Best regards,
Soundsurf