News: 25 March 2011. Britain’s leading solar heating product inventor, Archibald William Kerr MacGregor, 70, of Temple Village, Midlothian, Scotland, died suddenly on Tuesday this week while involved in promoting solar energy. Kerr MacGregor invented Solartwin (initially known as Flex-sol) , a simple, freeze tolerant, solar water heating system. Over 5000 Solartwin installations are in [...]
















