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1 Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. 2  Direct-vent gas fireplaces cost $1,000 to $3,500, plus $500 to $1,000 for installation.
What are fireplace inserts? A fireplace insert is a wood stove designed to fit inside an existing fireplace. It functions just as a wood stove does and should be EPA-certified. And just as there are gas and pellet stoves, there are gas and pellet fireplace inserts that burn cleaner and more efficiently. Top of page.