A bright orange flame flickers in the FIREPLACE. It doesn't matter that it's April and not terribly chilly outside. In a home, a FIREPLACE needs a fire, because that's what FIREPLACE is for. A fire BELONGS in a FIREPLACE, dammit, cata(ptcha)gorically, at all times, without exception.
As domestic myth of unaccountable origin holds, a home borrows the spirit of the flame for as long as it makes a guest of it, much as the moon takes liberty with the sun's rays.
"The moon's an arrant thief, and her pale fire she snatches from the sun." -Mark Twain
You are almost certain Mark Twain said that.