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Napoleon S20i Wood Fireplace Insert

Approx. Heating Area: 800 - 1,800 sq. ft.
Max Output: 65,000 BTU/h
Starting at $2249


The Napoleon S20i wood fireplace insert features outside dimensions on the smaller side so it is able to be installed in most existing fireplace openings. The minimum fireplace opening for the Napoleon fireplace insert is 25 7/8" wide x 22" high x 14" deep. While the S20i fireplace insert measures smaller than other Napoleon inserts, it's heating capacity is impressive at 800 - 1,800 square feet with a 1.9 cu. ft. firebox capacity.

This Napoleon wood insert has everything you are looking in heating capacity as well as appearance. This unit has a modest sleek design and features hidden door hinges. The door is fabricated with the viewer in mind by offering a large glass surface area to view the fire.


    • High-efficiency appliance 2020 EPA approved
    • Blower Kit with Variable Speed Control
    • Recommended heating area : 800 - 1,800 square feet
    • Flashing Backerplate measures 30" tall x 41" wide
    • Color: Black
    • Non-catalytic combustion technology
    • Optimum efficiency : 72%
    • Emissions (grams/hour) : 2.25 g/h
    • Hidden door hinges
    • Maximum burn time : 8 hours
    • Firebox lined with refractory bricks for better heat distribution
    • Stainless-steel secondary-air system improving gas combustion
    • Recommended chimney diameter : 6"
    • Approved Chimney Liner: Rock-Flex Stainless Flexible Liner Kit

Specifications & Manual

Napoleon S20i Wood Insert Manual

Napoleon S20i Wood Insert Dimensions

Napoleon S20i Insert Specifications
Minimum fireplace opening (Width) 25 7/8"
Minimum fireplace opening (Height) 22"
Minimum fireplace opening (Depth) 14"
Firebox dimensions (Width) 25 3/8"
Firebox dimensions (Height) 20 1/2"
Maximum log length 16"
Type of Door Single, glass with cast iron frame
Glass Surface 15 5/8" x 9 3/4"
Weight 285 lb
Firebox volume (cu. ft.) 1.9
Glass Type Ceramic glass
Depth - Overall 26 1/2"
Height - Overall 21 3/4"
Width - Overall 25 3/8"
Canadian Standard (emissions) CSA B415.1-10
USA standard (emissions) EPA
Canadian Standard (safety) ULC-S628
USA standard (safety) UL 1482
Maximum output - seasoned cord wood 65,000 BTU/h
Type of Fuel Wood
Type of Chimney (°F) Liner - ULC-S635, CAN/ULC-S640, UL1777
Minimum chimney height (feet) 15'
Log positioning Over width
Recommended Heating Area (sq. ft.) 800-1,800
Steel thickness (top) 5/16"
Optimum efficiency 72%
Emissions (grams/hour) 2.25 g/h
Recommended chimney diameter 6"
Warranty President's Limited Lifetime

Minimum Clearances to Combustibles

Napoleon S20i Insert Minimum Clearances to Combustibles*
Clearance - top (measured from the platform on which the appliance is installed)** 84"
Clearance - combustible mantle to unit 30"
Clearance - side wall to unit 16"
Clearance - minimum floor protection in front of the fireplace 22"
* The information given on the certification label affixed to the appliance always overrides the information published in any other media (owner's manual, catalogues, flyers, magazines and/or web sites).
** Some appliances have been tested with a low ceiling. Before setting up your unit, refer to the installation manual.

Required Option Details


The Napoleon Backerplate is used to seal the gap between the top and side of the insert to the fireplace. This unique 1-piece Backerplate will seal a fireplace opening that measures less than 30" in height and 41" in width. The one piece designs gives the unit a finished appearance without the commonly found multi-piece flashing. The Backerplate easily hooks to the insert for a simple installation. A Backerplate is required to complete the installation of the insert.

More Information
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