Wattcraft is the UK agent for Transol. Transol is a tool for design, calculation and optimisation of solar thermal systems. Transol makes dynamic simulation simple (using the TRNSYS engine) through a user-friendly interface. It incorporates weather data for the entire world and an extensive database for solar collectors, storage tanks, insulation materials, etc. and provides detailed performance and economic reports. This tool has been developed through an ambitious project carried out by Aiguasol in collaboration with the French research centre CSTB (Centre Scientifique et Technique du Bâtiment).

To find out more about the tool or to order it, please contact Rupert Blackstone by email  to or by telephone on +44 (0)20 81442110 or via the form on the contacts page.

You may purchase a licence for Transol directly via: