I have ripped out a one pipe system and installed new piping and new rads throughout my property and have just carried out a 48 hr pressure test without any faults. I am now at the point where I can get the boiler installed. My question is this, I will be getting in a Gas registered fitter to actually install the boiler and electrics and would like to know if I will run into problems getting him to sign it off as I have heard that they can only sign off their own work (which makes sense). So really my question is, is a Gas certificate for the boiler itself or is it for the boiler, pipework and rads. Thanks in advance.