Most people don't
realize that the color of your radiator shouldn't be chosen
solely based on the color of the room's decor that the radiator
resides in. But the color your radiator is painted also affects
just how much heat it gives off too!
Darker colors radiate
heat better than lighter colors, and a flat / matte finish
radiates better than a shiny / glossy finish. This means your
best choice would be a black matte color, while the worst
would be glossy white.
Of course, not
all decors will go with the black radiator. So you can expand
on this by selected a dark color that still goes with your
color scheme, whether it be a navy, forest green, burgundy,
etc. But do keep in mind that the darker the better and the
flatter the better.