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Heating and cooling – with up to 70 % less operating costs

Below a depth of approximately 10 – 15 feet (3 – 5 meters), the ground has a consistent temperature of 46 °F to 54 °F (8 °C to 12 °C). GEOKOAX makes use of this renewable geothermal heat by means of a closed vertical geothermal pipe system made from high density polyethylene (HDPE) in the ground. Heat exchange fluid circulates within the GEOKOAX heat exchanger, absorbs geothermal heat and transfers this to the heat pump. The heat pump utilizes the heat from the fluid, by means of the vapour compression cycle, to generate hot water, as well as heat or cool the building’s conditioned space.

Fit and forget

Geothermal energy is now possible anywhere: Due to lower overall drilling depth requirements, GEOKOAX is effective for project sites with limited land area as well as sites that have depth limitations due to environmental concerns - reliably and predictablyCertified software and monitoring tools give you the security and confidence you need as a designer or developer.

Geothermal energy comes at low cost

By installing GEOKOAX heat exchanger technology with significantly lower running times of the electric heat pump than with conventional single U - bends, you can save on energy costs by up to 70 %.


The core of the of GEOKOAX heat exchanger technology is passive turbulence. The continuous change from laminar flow to turbulent flow increases the heat transfer coefficient by 20 % in the case of a 10 ft. (3 m) heat exchanger and by up to 100 % in the case of a 33 ft. (10 m) heat exchanger as compared to U – bend configurations. (Source: RWTH (Rheinisch Westphalian Technical University) Aachen)


The GEOKOAX heat exchanger features about 13 times as much carrier fluid volume as conventional 1.00" Single-U–Bend systems. The coaxial tube is filled with a heat carrier liquid with particularly low viscosity and serves to store heat. This permits a precise release of the required energy at a constant temperature and also longer down-times of the heat pump, extending equipment life and enhancing annual performance figures.

Low borehole resistance

Conventional U – bend piping configurations have proven to be suboptimal for the transmission of energy due to the non-uniform spacing between the piping and the surrounding geology. The concentric orientation of the GEOKOAX coaxial outer pipe ensures that the annular space between the coaxial heat exchanger and the ground is uniform leading to significantly lower borehole resistance. This makes for much better transfer of energy which is reflected in annual performance figures.

Our Projects

Effective all types of geology, with any heat pump system, in new and existing buildings, in all sizes. GEOKOAX products have a proven track record with more than 1,200 installations. Our projects are our best recommendation.

What geothermal energy offers

Use free geothermal heat not only to heat your property, but also to cool it. Operating costs are minimal, the energy generated is environmentally friendly and – in most countries – eligible for government grants.


Spanning properties ranging from residential and commercial buildings to hospitals and office buildings and including open-air structures such as bridges and railroad switches - GEOKOAX will heat and cool whatever you require.