Q: If I decide to move a cast-iron radiator, where should I reinstall it?
A: Ideally, a cast-iron radiator should be under the window (that’s where the greatest heat loss is), and it should be as wide as the window. Its top should never peek above the windowsill because this lessens the convective movement of air around the radiator. Speaking of which, for maximum convective efficiency, the radiator should be 2-1/2 inches away from the wall. It took the old-timers years to figure that out.