They say 85% overall efficient out of which 65% heat recovery and electrical output 1kW, thermal 3.5kW. The size of a small washing machine (date: April 2005) http://world.honda.com/news/2005/p050427.html Peter -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist