Natural gas fireplaces run from your home's utility line, so there is no tank to refill and the fuel is usually cheaper to burn than propane. The models here are rated in BTU, with many linear and traditional units sitting between 10,000 and 65,000 BTU. You will see Napoleon, Montigo DelRay, Empire Boulevard, Superior and others, in direct vent and vent free designs. Because most of these boxes can also be set up for propane, the page lets you compare natural gas options by size, heat output and viewing area, without leaving the listing.

40 products
  • Superior VRT3100 Vent-Free Gas Firebox – Back Bay Brown Fiber Liners 40,000 BTU Superior VRT3100 Vent-Free Gas Firebox – Back Bay Brown Fiber Liners 40,000 BTU
    Superior VRT3100 Vent-Free Gas Firebox – Back Bay Brown Fiber Liners 40,000 BTU
    Superior Fireplaces

    Superior VRT3100 Vent-Free Gas Firebox – Back Bay Brown Fiber Liners 40,000 BTU

    Vent-Free Firebox · Back Bay Brown Fiber Liners · 32", 36" or 42" Warm Back Bay Brown liners in the same VRT3100 shell This VRT3100 swaps the white refractory for...
    $999.00
    $999.00

    40k BTUNatural Gas / PropaneVent-Free32 / 36 / 42 in view

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  • Superior VRT3100 Vent-Free Gas Firebox – White Stacked Liners 40,000 BTU Superior VRT3100 Vent-Free Gas Firebox – White Stacked Liners 40,000 BTU
    Superior VRT3100 Vent-Free Gas Firebox – White Stacked Liners 40,000 BTU
    Superior Fireplaces

    Superior VRT3100 Vent-Free Gas Firebox – White Stacked Liners 40,000 BTU

    Vent-Free Firebox · White Stacked Liners · 32", 36" or 42" A heat-circulating firebox with bright white stacked liners The Superior VRT3100 in white stacked liners is a clean-faced, heat-circulating...
    $999.00
    $999.00

    40k BTUNatural Gas / PropaneVent-Free32 / 36 / 42 in view

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  • Empire Tahoe 32" Direct Vent Propane or Natural Gas Fireplace Empire Tahoe Deluxe direct vent fireplace (series photo)
    Empire Tahoe 32" Direct Vent Propane or Natural Gas Fireplace
    $180 off
    Empire

    Empire Tahoe 32" Direct Vent Propane or Natural Gas Fireplace

    Direct Vent Gas Fireplace · 32 in. · Natural Gas or Propane · Millivolt A millivolt direct vent fireplace that fits a slim wall cavity The Empire Tahoe Deluxe 32...
    $1,729.00
    $1,909.00 $1,729.00

    18k BTUNatural Gas / PropaneDirect Vent32 in view

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    Sale
  • Empire Breckenridge 36" Vent Free See Through Premium Firebox 40,000 BTU Empire Breckenridge 36" Vent Free See Through Premium Firebox 40,000 BTU
    Empire Breckenridge 36" Vent Free See Through Premium Firebox 40,000 BTU
    Empire

    Empire Breckenridge 36" Vent Free See Through Premium Firebox 40,000 BTU

    Vent Free See-Through Premium Firebox · 36 in. · 40,000 BTU · Zero Clearance A see-through vent free firebox for sharing a fire between rooms The Empire Breckenridge 36 Premium...
    $1,849.00
    $1,849.00

    40k BTUNatural Gas / PropaneVent-Free36 in view

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  • Empire Breckenridge 42" Vent Free Deluxe Firebox 40,000 BTU Empire Breckenridge 42" Vent Free Deluxe Firebox 40,000 BTU
    Empire Breckenridge 42" Vent Free Deluxe Firebox 40,000 BTU
    Empire

    Empire Breckenridge 42" Vent Free Deluxe Firebox 40,000 BTU

    Vent Free Deluxe Firebox · 42 in. · 40,000 BTU · Zero Clearance The widest Deluxe firebox for a full-size vent free hearth The Empire Breckenridge 42 Deluxe (VFD42FB) is...
    $799.00
    $799.00

    40k BTUNatural Gas / PropaneVent-Free42 in view

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  • Empire Breckenridge 36" Vent Free Deluxe Firebox 40,000 BTU Empire Breckenridge 36" Vent Free Deluxe Firebox 40,000 BTU
    Empire Breckenridge 36" Vent Free Deluxe Firebox 40,000 BTU
    Empire

    Empire Breckenridge 36" Vent Free Deluxe Firebox 40,000 BTU

    Vent Free Deluxe Firebox · 36 in. · 40,000 BTU · Zero Clearance A 36-inch vent free firebox with a flush or louvered face The Empire Breckenridge 36 Deluxe (VFD36FB)...
    $689.00
    $689.00

    40k BTUNatural Gas / PropaneVent-Free36 in view

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  • Empire Breckenridge 32" Vent Free Deluxe Firebox 40,000 BTU Empire Breckenridge 32" Vent Free Deluxe Firebox 40,000 BTU
    Empire Breckenridge 32" Vent Free Deluxe Firebox 40,000 BTU
    Empire

    Empire Breckenridge 32" Vent Free Deluxe Firebox 40,000 BTU

    Vent Free Deluxe Firebox · 32 in. · 40,000 BTU · Zero Clearance A 32-inch firebox shell for a vent free fire of your own design The Empire Breckenridge 32...
    $629.00
    $629.00

    40k BTUNatural Gas / PropaneVent-Free32 in view

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  • Empire Boulevard 48" Direct Vent Linear See-Through Fireplace 37,000 BTU Empire Boulevard 48" Direct Vent Linear See-Through Fireplace 37,000 BTU
    Empire Boulevard 48" Direct Vent Linear See-Through Fireplace 37,000 BTU
    Empire

    Empire Boulevard 48" Direct Vent Linear See-Through Fireplace 37,000 BTU

    Direct Vent See-Through Linear Gas Fireplace · 48 in. · 37,000 BTU A see-through linear fire for dividing walls and covered patios The Boulevard 48 See-Through direct vent fireplace gives...
    $7,949.00
    $7,949.00

    37k BTUNatural Gas / PropaneDirect Vent48 in view

    Ready to ship free US delivery

  • Empire Boulevard 72" Direct Vent Linear Fireplace 52,500 BTU Empire Boulevard 72" Direct Vent Linear Fireplace 52,500 BTU
    Empire Boulevard 72" Direct Vent Linear Fireplace 52,500 BTU
    Empire

    Empire Boulevard 72" Direct Vent Linear Fireplace 52,500 BTU

    Direct Vent Linear Gas Fireplace · 72 in. · 52,500 BTU Six feet of direct vent flame at up to 52,500 BTU The Boulevard 72 is the largest Boulevard direct...
    $10,199.00
    $10,199.00

    52.5k BTUNatural Gas / PropaneDirect Vent72 in view

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  • Empire Boulevard 60" Direct Vent Linear Fireplace 46,000 BTU Empire Boulevard 60" Direct Vent Linear Fireplace 46,000 BTU
    Empire Boulevard 60" Direct Vent Linear Fireplace 46,000 BTU
    Empire

    Empire Boulevard 60" Direct Vent Linear Fireplace 46,000 BTU

    Direct Vent Linear Gas Fireplace · 60 in. · 46,000 BTU A five-foot statement fireplace for lobbies and great rooms The Boulevard 60 direct vent linear fireplace offers up to...
    $6,259.00
    $6,259.00

    46k BTUNatural Gas / PropaneDirect Vent60 in view

    Ready to ship free US delivery

  • Empire Boulevard 48" Direct Vent Linear Fireplace 38,000 BTU Empire Boulevard 48 direct vent linear fireplace
    Empire Boulevard 48" Direct Vent Linear Fireplace 38,000 BTU
    Empire

    Empire Boulevard 48" Direct Vent Linear Fireplace 38,000 BTU

    Direct Vent Linear Gas Fireplace · 48 in. · 38,000 BTU Four feet of zero clearance linear fire for family rooms and lobbies The Boulevard 48 direct vent linear fireplace...
    $4,999.00
    $4,999.00

    38k BTUNatural Gas / PropaneDirect Vent48 in view

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  • Empire Boulevard 36" Direct Vent Linear Fireplace 29,000 BTU Empire Boulevard 36" Direct Vent Linear Fireplace 29,000 BTU
    Empire Boulevard 36" Direct Vent Linear Fireplace 29,000 BTU
    Empire

    Empire Boulevard 36" Direct Vent Linear Fireplace 29,000 BTU

    Direct Vent Linear Gas Fireplace · 36 in. · 29,000 BTU A fully recessed 36-inch linear flame that keeps running in a power cut The Empire Boulevard 36 direct vent...
    $4,649.00
    $4,649.00

    29k BTUNatural Gas / PropaneDirect Vent36 in view

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  • Empire Boulevard 60" Vent Free See-Through Linear Fireplace 40,000 BTU Empire Boulevard 60" Vent Free See-Through Linear Fireplace 40,000 BTU
    Empire Boulevard 60" Vent Free See-Through Linear Fireplace 40,000 BTU
    Empire

    Empire Boulevard 60" Vent Free See-Through Linear Fireplace 40,000 BTU

    Vent Free See-Through Linear Fireplace · 60 in. · 40,000 BTU A five-foot see-through fire that can face the patio The Boulevard 60 See-Through connects two rooms, or an indoor...
    $5,799.00
    $5,799.00

    40k BTUNatural Gas / PropaneVent-Free60 in view

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  • Empire Boulevard 48" Vent Free See-Through Linear Fireplace 36,000 BTU Empire Boulevard 48" Vent Free See-Through Linear Fireplace 36,000 BTU
    Empire Boulevard 48" Vent Free See-Through Linear Fireplace 36,000 BTU
    Empire

    Empire Boulevard 48" Vent Free See-Through Linear Fireplace 36,000 BTU

    Vent Free See-Through Linear Fireplace · 48 in. · 36,000 BTU One flame, two rooms, no vent The Boulevard 48 See-Through is a double-sided vent free linear fireplace rated at...
    $3,539.00
    $3,539.00

    36k BTUNatural Gas / PropaneVent-Free48 in view

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  • Empire Boulevard 72" Vent Free Linear Fireplace 40,000 BTU Empire Boulevard 72" Vent Free Linear Fireplace 40,000 BTU
    Empire Boulevard 72" Vent Free Linear Fireplace 40,000 BTU
    Empire

    Empire Boulevard 72" Vent Free Linear Fireplace 40,000 BTU

    Vent Free Linear Fireplace · 72 in. · 40,000 BTU Six feet of fireplace on a vent free system The Boulevard 72 is the widest in the vent free linear...
    $6,729.00
    $6,729.00

    40k BTUNatural Gas / PropaneVent-Free72 in view

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  • Empire Boulevard 60" Vent Free Linear Fireplace 40,000 BTU Empire Boulevard 60" Vent Free Linear Fireplace 40,000 BTU
    Empire Boulevard 60" Vent Free Linear Fireplace 40,000 BTU
    Empire

    Empire Boulevard 60" Vent Free Linear Fireplace 40,000 BTU

    Vent Free Linear Fireplace · 60 in. · 40,000 BTU A five-foot vent free fireplace with color-changing lights The Boulevard 60 gives you a five-foot opening, 40,000 BTU on natural...
    $4,519.00
    $4,519.00

    40k BTUNatural Gas / PropaneVent-Free60 in view

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  • Empire Boulevard 48" Vent Free Linear Fireplace 32,000 BTU Empire Boulevard 48" Vent Free Linear Fireplace 32,000 BTU
    Empire Boulevard 48" Vent Free Linear Fireplace 32,000 BTU
    Empire

    Empire Boulevard 48" Vent Free Linear Fireplace 32,000 BTU

    Vent Free Linear Fireplace · 48 in. · 32,000 BTU Four feet of vent free flame for a feature wall The Empire Boulevard 48 (VFLB48FP) steps up to 32,000 BTU...
    $3,449.00
    $3,449.00

    32k BTUNatural Gas / PropaneVent-Free48 in view

    Ready to ship free US delivery

  • Empire Boulevard 36" Vent Free Linear Fireplace 28,000 BTU Empire Boulevard 36" Vent Free Linear Fireplace 28,000 BTU
    Empire Boulevard 36" Vent Free Linear Fireplace 28,000 BTU
    Empire

    Empire Boulevard 36" Vent Free Linear Fireplace 28,000 BTU

    Vent Free Linear Fireplace · 36 in. · 28,000 BTU Add a long, low flame to a wall with no vent run The Empire Boulevard 36 (VFLB36FP) is a vent...
    $2,649.00
    $2,649.00

    28k BTUNatural Gas / PropaneVent-Free36 in view

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  • Montigo DelRay 46" Full Load Single-Sided Direct Vent Square Gas Fireplace 40,000 BTU Montigo DelRay 46" Full Load Single-Sided Direct Vent Square Gas Fireplace 40,000 BTU
    Montigo DelRay 46" Full Load Single-Sided Direct Vent Square Gas Fireplace 40,000 BTU
    Montigo

    Montigo DelRay 46" Full Load Single-Sided Direct Vent Square Gas Fireplace 40,000 BTU

    Full Load Direct Vent Square Gas Fireplace · 46 in. · 40,000 BTU The flagship DelRay Square with every control already in the box The DelRay Square 46 Full Load...
    $6,049.00
    $6,049.00

    40k BTUNatural Gas / PropaneDirect Vent46 in view

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  • Montigo DelRay 42" Full Load Single-Sided Direct Vent Square Gas Fireplace 32,500 BTU Montigo DelRay 42" Full Load Single-Sided Direct Vent Square Gas Fireplace 32,500 BTU
    Montigo DelRay 42" Full Load Single-Sided Direct Vent Square Gas Fireplace 32,500 BTU
    Montigo

    Montigo DelRay 42" Full Load Single-Sided Direct Vent Square Gas Fireplace 32,500 BTU

    Full Load Direct Vent Square Gas Fireplace · 42 in. · 32,500 BTU Large-room heat from a square fireplace that comes complete The DelRay Square 42 Full Load (DRSQ42-2) pairs...
    $5,519.00
    $5,519.00

    32.5k BTUNatural Gas / PropaneDirect Vent42 in view

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Natural gas fireplaces and BTU ratings explained

BTU is the number buyers search most, and it is a measure of maximum burn rate, not comfort. A unit around 10,000 BTU suits a bedroom or a well-insulated small room, while a 40,000 BTU box is built for large or open areas. Pair the rating with the room's square footage and ceiling height, and leave a margin so you can run the flame low. Confirm that a gas line can reach the install point, since a licensed installer will need to extend it. If your building has propane only, the same models are usually offered in a propane configuration, which you select as an option on the product.

How many BTU do I need for a natural gas fireplace?

For a typical living room, a rating between 20,000 and 40,000 BTU is common. Bedrooms need less, open plans need more. Insulation and ceiling height also change the answer.

Can a natural gas fireplace be converted to propane?

On many models yes, but only with the manufacturer's conversion kit and a qualified installer. The product page notes which fuel options each model supports.