I am putting in a wood floor in my dining room. The baseboard radiator is too low to the floor for me to slide the new flooring under it. Someone recommended that I detach the radiator from the wall, push it up an inch or two, and reattach it. I started doing this, but the inlet copper pipe into the baseboard is now leaking. I have a torch and solder and flux. But there is water in the radiator. Do I need to drain the radiator first before soldering? How do I that?. At the oil burner?