Hi all . I have a 3 bedroom house and decided to add an extra room away from the house Bedroom and shower . It's about 10 Ft , from the house and I added a double rad to the room and one in the bathroom . I took the feed for the rads from the last double rad which is in my kitchen and the pipes are underground insulated . All the rads in the house heat up fine and although there is no air in the system I can't get heat to the ones outside . The boiler I have is a Gloworm Micron 60ff which has 10 rads on the system . I would be grateful far any suggestions on how to solve this . Thanks .