Solution | Product

Solar space heating

Solar-powered air heaters and rock bed thermal storage to heat homes

This robust, low-cost solution allows for homes to be heated reliably and cheaply in challenging high-mountain regions like the Argentinian and Bolivian Altiplano, Ladakh and Kargil in the Himalayas.

Based on proven technology, a simple solar air heater circulates air through a rock bed below the floor in a closed loop. The floor provides under-floor heating, creating an ideal temperature distribution in the room. Due to the big thermal capacity of the rock bed, rooms are heated 24h per day, even during 1-2 days without sun. No more searching for fire wood, or buying gas, no more smoke in the rooms which contributes to respiratory diseases or carbon monoxide incidents.

Key features for a positive impact on quality of life

  • Air is used as heat transfer medium - no anti-freezing agent, no pressure at stagnation temperature in summer, no corrosion). Small leakages do not affect performance. No electronics used.
  • Modularity allows adaptation to many consumer needs from collector sizes of 2 m² to 120 m²
  • Easy to transport and assemble, due to sturdy modular design at low weight. Glass is placed during installation.
  • Rocks are available in many regions at low cost which permitting big storage heat capacity, so the heat demand can even be covered for 1-2 days without sun
  • Minimal user operation required. Just a on/off switch for the automatic fan operation in heating season.


  • Depending on the region, the system saves up to 90% of the conventional fuel used for space heating, translating to 370 USD per home in Ladakh and Kargil.
  • Initial investment is paid off in 4-5 years.
  • Locally sourced and produced materials allow for easy maintenance and job creation in the region.

The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances.

Simply Solar

89344 Aislingen, Germany

Activity regions
Central Asia, Ethiopia, Morocco, South Africa, Argentina, Bolivia, Chile, Peru, Mexico, Mongolia, India, Afghanistan, Bhutan, Iran, Nepal, Pakistan, Armenia, Azerbaijan, Iraq, Syria, Turkey, Ukraine, Spain,

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Solutions helps to achieve these SDG's.

  • Affordable and clean energy

  • Sustainable cities and communities

Maturity stage

Looking for

New partners and projects in regions with cold, yet sunny Winters.

Categories of application
Solar thermal, Thermal, Water heating, Heating,