Im in the market for a new combi boiler to replace my very old gravity boiler system. Obviously you could go hight street like British Gas and get it done or i could get a friend of my father in laws to do it on the cheap. But with all this new legislation for energy efficiency and selling properties i really dont know what to do. Does the installer need to be CORGI and do i need some sort of paperwork to meet new legislation etc. Your advice would be much apreciated. Thanks. Ben