For the economical supply of solar process heat at temperatures between 120 and 150 degrees C a new non-tracking, fiat, low-concentrating collector has been developed. The new collector is an edge ray collector with a concentration of 1 8 and Inert gas filling, existing of parallel mounted absorber-reflector units, aligned in east west direction The basic concept is the integration of an absorber tube and reflectors inside a low pressure enclosure. Asymmetrical reflectors below the headers with a concentration of 0 6X provide extra radiation and prevent longitudinal radiation losses To suppress heat losses due to gas-convection inside, air or inert gas like krypton at a pressure below 10 mbar is used A prototype, with an aperture area of 20 m(2), was tested in Munich and showed efficiencies of about 50% for krypton at 001 bar at a temperature of 150 degrees C with a radiation of 1000 W/m(2) (900 W/m(2) direct, ambient temperature 20 degrees C) (C) 2010 Elsevier Ltd All rights reserved