Hi my name is Lee i am an Electrician. Their could be a number of reasons why your fuse board keeps tripping out. I would suggest that your radiator has a fault that your freinds house does not pick up. There are many different types of fuses and some are more sensitive than others. Fuses trip for a reason as they are safety devices. I would suggest you get the raddiator checked by some one qualified.
lee
October 2008