Harmony Direct Vent Gas Insert

Make a statement with the Harmony fireplace insert. Featuring five different framing choices and two distinct interior options, this insert also offers increased heating efficiency, so you’ll save energy and lower your fuel costs.

Available Sizes:

  • M

Quick Look:

VentingDirect Vent
Heating CapacityUp to 1,600 sq. ft.
Max BTUs/hr21,500-31,000
Cost to Operate$0.33-$0.78*

* Based on cost/therm. According to the Federal Register Energy Conservation Program for Consumer Products.

Note: A safety barrier is standard on all direct vent inserts. As a result, images shown may differ slightly from actual product.

Lookin’ Good

At Monessen, we know that “style” isn’t just about great looks. It’s a statement about the way you live your life. That's why we've created the Harmony direct vent gas insert. With five different facing choices and a variety of interior options, Harmony direct vent gas inserts have the style part covered. Plus, an insert increases heating efficiency, which helps save energy and lower fuel costs. If you want to upgrade your masonry fireplace with a punch of style or simply live greener, look no further than the Harmony by Monessen.


Harmony with Glass Trim in Textured Mocha with Contemporary Stone and Glass Kit.


Large Harmony with Rectangular Contemporary Doors in Satin Black with Cottage Clay Firebrick and Log Set.


Harmony with Square Contemporary Face in Iron Age with Cottage Red Firebrick and Log Set.


Harmony with Floating Face in Vintage Iron with Black Porcelain Panels and Contemporary Stone and Glass Kit.

Accessories that fit your home and lifestyle

  • Rectangular Contemporary Door

    This decorative double door kit is hinged on one side, so it opens like a single door. Includes an optional screen.

  • Arched Contemporary Door

    This decorative double door kit is hinged on one side, so it opens like a single door. Includes an optional screen.

  • Floating Face

    Add this fireplace facing and bring a modernist touch to your space. Includes an optional screen.

  • Square Contemporary Face

    Clean angles define this facing kit, which is available in two different color options.

  • Glass Trim

    The contemporary look of glass adds sophistication to these trim kits. Choose between two different color options.

  • Surrounds

    A Surround is required for proper installation. Our black, three-sided Surround kits come in three sizes, and each one is compatible with any decorative facing. Your dealer can help you decide which Surround is best for your fireplace.

  • Light Kit

    Add the drama of instant lighting to your hearth with this option, making it the focal point of your room, even when it isn't lit.

  • Contemporary Glass Kits

    Contemporary stone kits offer an alternative to traditional firebrick. Choose from a wide variety of compatible glass kits to create just the right accent.

  • LP Conversion Kit

    Convert your insert to accept Liquid Propane (LP) fuel.

Dimensions in inches. Refer to installation/owner's manual for detailed specifications on installing this product. Hearth & Home Technologies reserves the right to update units periodically. Product installation must adhere strictly to instructions shipped with product.

Model Specifications


Size: Medium
Fuel Type: Natural Gas
Heating Capacity: Up to 1600 sq ft
Max BTU/H: 31,000 (NG) / 29,000 (LP)
Dimensions: 29 (W) x 20 (H) x 16 (D)
Minimum Opening Dimensions: 29-1/2 (W) x 20-1/4 (H) x 16-1/4 (D) x 22-1/2 (RW)
Ignition System: TSCS
Termination: Top
Certifications: CSA Design
Fire Viewing Area: 25-1/4" x 16-1/5" (Cottage Clay Firebrick and Log Set)
26-1/4" x 16-1/5" (Black Porcelain Panels with Stone & Fireglass)

Efficiency Chart


AFUE: Up to 71%
Canadian P4 Efficiency: Up to 84%
Heat output will vary depending on the type of fuel used. The flame and ember appearance may vary based on the type of fuel burned and the venting configuration used. Actual product appearance, including flame may differ from image shown. Refer to the Owners Manual for complete clearance requirements and specifications. Product specifications and pricing subject to change without notice. For testing and listing information please refer to the owners/installation manual.
*For select products: Heating capacity to be used as a guide only. See your local dealer for help in determining the product that best suits your heating needs based on climate and home efficiency.
For wood-burning appliances: Actual burn times will vary based on how the appliance is operated, load size, moisture content and type of wood used, and installation.