The average price for the highest-quality fireplace inserts is approximately $1600, according to Finest Fires. Prices for most inserts range from a few hundred dollars to about $2500, depending on installation and energy type.
Highly rated electric fireplace inserts are installed into an existing hearth unit and cost around $300, Finest Fires reports. However, top of the line models are practically entirely new installations and typically burn wood for heat. These units top out at around $2500. Common features of top-quality fireplace inserts include adjustable air flow, direct venting and cast iron doors. Prospective buyers should look for these features and make sure that their fireplace units are compatible with the fireplace insert's venting system.