Geothermal District Heating

Mannvit is a leader in geothermal district heating and offers comprehensive design and consulting services including: exploration surveys, drilling consulting, piping systems, systems analysis, flow calculations and measurements, water catchments, supply mains, distribution systems and pumping stations.

The company has played a significant role in the development of Iceland’s geothermal district and municipal heating since the early 1960s and is now involved in geothermal development projects, including district heating in Hungary, Croatia, Serbia, Germany, Greece, Poland, Romania and elsewhere. Mannvit's office in Budapest and our subsidiary offices of GTN in Germany provide local knowledge in combination with international expertise to district heating projects. 

Iceland’s various geothermal district and municipal heating entities provide space heating and hot water to over 90% of homes and buildings. The capital city, Reykjavik boasts the world’s largest and most sophisticated geothermal district heating systems in the world, a development project that began in the 1930s and continues today.  This use of geothermal and other renewable resources over the last 90 years has made Reykjavik one of the cleanest cities in the world. Iceland uses this abundant source of geothermal energy for many applications beyond space heating and hot water for homes and businesses including, greenhouse heating, snow melting, fish farming, seafood drying, thermal spas, swimming pools and more.

Geothermal District Heating Design -

Benefits of Geothermal District Heating:

  • Environmentally-friendly
  • Economically competitive
  • Reliable source of energy
  • Improved air quality
  • Price stability vs. fossil fuels
  • Energy security in a domestic local energy source
  • Multiple domestic and industrial uses
  • Offers competitive advantages to industry
  • Improved public image

Geothermal District Heating is the use of geothermal energy (in the form of hot water) to heat homes and businesses in a particular region by moving the heat from underground, into homes and businesses.  

In lower pressure geothermal systems and shallower wells, water heated underground is brought to the surface and pumped through large pipes directly into businesses and homes for space heating.

Higher pressure systems from deeper wells are too hot to pump directly and often have high salinity and high mineral content, which is very corrosive to equipment.  To avoid costly damage, heat is transferred from the corrosive water to fresh water for transportation to homes and businesses.  

Higher pressure geothermal plants also use the heat to create steam and operate turbines to produce electricity.  Plants that produce electricity and supply hot water are called Co-Generation or Co-Gen plants. 

Using District Heating, both low and high-pressure systems can provide a great deal of heat energy directly to a large number of residences and business in a particular region.  Geothermal energy is a very clean and environmentally responsible type of energy.  Geothermal energy and geothermal district heating has a near-zero carbon footprint. 

Geothermal district heating development is growing, with over 300 plants in operation in Europe alone. 


Brynjólfur Björnsson

Discipline Manager, Utilities

+354 422 3017

Jóhann Þór Magnússon

Discipline Manager Control Systems

+354 422 3428

Gunnar Sverrir Gunnarsson

Section Manager Mechanical

+354 422 3088

Jón Jónsson

Electrical Engineer B.Sc. Control systems

+354 422 3456


Geothermal development consulting