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I understand the principle behind radiant heat and color. (try heating an aluminum non-stick pan and hold it up in front of your face. The silvery aluminum side will radiate much less heat than the darker non-stick side).
What confuses me is how that would affect radiator efficiency. Wouldn't the total thermal energy that's stored in a radiator make its way into the room regardless of the color. A black radiator would simply cool down faster than a white one, but both would give up their heat to the room eventually?
In my backward way of thinking, wouldn't the color of the INTERIOR of the radiator be more important. If the interior were black it would absorb the steam's heat faster...