solar pump for water

The solar pump is intended for lifting and swapping of water from wells. It is based on a cycle of Stirling engine and uses a difference of temperatures of sun warmed metal and cold water from a well. It has two cylinders, very simple design and self-start. At the area of heating of 2 square metres it lifts over 300 l of water per hour from depth of 5 m. Any special tools or machines are not required. Materials for a cheap variant stand only 150$. Look a site: http://www.lekw-w.com.
The patent was not on offer early.

Economic and financial information

Outright sale or a license with royalties