How much does a fireplace insert cost?

Wood insert (unit): $2,000-$4,500. Gas insert (unit): $2,000-$5,000. Pellet insert: $2,000-$4,000. Electric insert: $200-$2,000. Installation (including chimney liner, surround, and labor): $1,000-$3,000. Total installed: $3,000-$7,000 for wood or gas. Gas line (if not already present): $300-$800 additional. Federal tax credit: 30% of cost up to $2,000 for EPA-certified wood and pellet inserts (through 2032). With the tax credit: a $5,000 installed wood insert costs as little as $3,500 after the credit.

Are fireplace inserts worth it?

Yes, if you have an existing fireplace that you use or want to use. Benefits: converts a 5-15% efficient open fireplace to 65-85% efficient (a dramatic improvement), provides real heat (can heat 1,000-2,500 sq ft), reduces heating bills (offsets furnace use), eliminates drafts from an open damper, and modernizes the look of the fireplace. Payback: if the insert offsets $300-$800/year in furnace fuel costs (common in cold climates), it pays for itself in 5-10 years. For a fireplace you never use because it makes the room colder: a gas insert with a sealed damper eliminates the draft problem and adds a convenient heat source.

Gas or wood fireplace insert?

Gas advantages: no wood to haul, no ashes to clean, thermostat and remote control, consistent heat, instant on/off, cleaner operation, and lower maintenance. Wood advantages: higher heat output (up to 80,000 BTU vs. 40,000 for gas), lower fuel cost if you have access to cheap or free firewood, the authentic wood-fire experience (real wood flames and aroma), and qualifies for a larger tax credit. Best for convenience: gas. Best for serious heating: wood. Best for ambiance: personal preference (modern gas inserts look very realistic, but wood enthusiasts prefer the real thing). For most homeowners who want supplemental heat and convenience: gas is the better choice. For rural homeowners with wood access who want to significantly offset heating costs: wood.

Do I need a chimney liner for a fireplace insert?

Yes, in virtually all cases. A fireplace insert must be connected to a properly sized chimney liner. The original chimney flue (typically 8x12 or 12x12 for masonry chimneys) is oversized for an insert. An oversized flue does not draft properly and allows creosote buildup (fire hazard for wood inserts) and condensation (corrosion for gas inserts). A stainless steel liner (typically 6 inches for wood, 4-6 inches for gas) is installed inside the existing chimney. The liner connects directly to the insert and runs to the top of the chimney. Cost: $500-$2,000 installed. Some jurisdictions may allow direct-connect installations without a full liner, but a full liner is strongly recommended for safety and performance.

Article

Woodworking & Lumber

Fireplace Insert Guide: Types, Efficiency & Cost

Lumberama Editorial Team, Fireplace & Hearth Product Specialists Jul 28, 2026 13 min read

Why a Fireplace Insert

A traditional open fireplace is beautiful but extremely inefficient. An open fireplace is typically 5-15% efficient (meaning 85-95% of the heat goes up the chimney). Worse: an open fireplace can actually make your home colder (it pulls heated indoor air up the chimney and creates drafts that draw cold outdoor air into the house through gaps and cracks). A fireplace insert is a closed combustion unit that fits into the existing fireplace opening. It converts an inefficient open fireplace into an efficient heating appliance (65-85% efficiency). The insert uses a sealed firebox with glass doors, sends combustion air to the fire from outside (not from the room), and uses a blower to push heated air into the room.

Types

Wood-burning insert: Burns logs in a sealed firebox. Efficiency: 65-80% (EPA certified). Heat output: 40,000-80,000 BTU (heats 1,000-2,500 sq ft). Provides the authentic wood-fire experience (real flames, crackling, wood aroma). Requires: chimney relining (a stainless steel liner), regular chimney cleaning (annually), and a supply of firewood. Cost: $2,000-$4,500 (unit).

Gas insert: Burns natural gas or propane. Efficiency: 70-85%. Heat output: 20,000-40,000 BTU (heats 800-2,000 sq ft). Convenient (thermostat control, remote control, no wood to haul or ashes to clean). Realistic flame appearance (modern gas inserts look very convincing). Requires: a gas line to the fireplace. Cost: $2,000-$5,000 (unit).

Pellet insert: Burns compressed wood pellets from a hopper. Efficiency: 75-85%. Heat output: 30,000-60,000 BTU (heats 1,000-2,500 sq ft). Automated feeding (fill the hopper and it runs for 24-72 hours). Thermostat control. Less maintenance than wood. Requires: electricity (for the auger and blower) and a supply of wood pellets ($200-$300/ton). Cost: $2,000-$4,000 (unit).

Electric insert: An electric heater with a flame display (LED or holographic). No venting required (can be installed in any fireplace or on a wall). Heat output: 5,000-10,000 BTU (supplemental heat only). The flame is visual only (no real combustion). Cost: $200-$2,000 (unit).

Sizing

Sizing is based on BTU output and the area you want to heat. General guidelines: small room (400-800 sq ft): 20,000-30,000 BTU. Medium room (800-1,500 sq ft): 30,000-50,000 BTU. Large area (1,500-2,500 sq ft): 50,000-80,000 BTU. Climate matters: in cold climates (zones 5-8), size up. In mild climates (zones 1-4), a smaller insert provides plenty of heat. Important: the insert must physically fit the existing fireplace opening. Measure the fireplace opening (width, height, and depth) and compare to insert specifications. Most inserts fit standard masonry fireplaces. Prefabricated (zero-clearance) fireplaces may require specific insert sizes.

Installation

Installation includes: the insert unit, a chimney liner (stainless steel, run from the insert up through the chimney), a surround panel (covers the gap between the insert and the fireplace opening), a blower fan, and a gas line (for gas inserts). Professional installation is recommended (involves working with combustion appliances, gas lines, and chimney liners). Time: 4-8 hours. Licensed installer: ensures code compliance, warranty coverage, and safety.