Empire Stove Gateway 3500 Wood Stove (WB35FS)
A Large EPA 2020 Certified Wood Stove for 1,000–2,700 Square Feet with Up to 110,000 BTU/h
The Empire Stove Gateway 3500 is designed for spacious homes or rooms, heating 1,000–2,700 ft² with up to 110,000 BTU/h from a 3.5 ft³ firebox, with a one-lever air control, a no-mess ash pan, and an air wash system for easy operation and maintenance.
Key Features
- Recommended heating area of 1,000–2,700 ft² with up to 110,000 BTU/h maximum heat output
- Meets the EPA 2020 standard with non-catalytic secondary combustion at 1.6 g/h particulate emissions
- 3.5 ft³ firebox accepting logs up to 22" (16" recommended) with up to 10 hours of burn time
- Simple one-lever air control adjusts the burn rate
- No-mess ash pan with cover, supplied with the pedestal or leg kit
- Air wash system and high temperature ceramic glass window
- 5/16" thick steel top, firebrick-lined firebox, and high heat ceramic baffle
- Style options: black or nickel door overlay; pedestal, straight legs, or Queen Anne legs; step top add-on
- Approved for alcove installation and for mobile homes with the fresh air intake kit (pedestal version only)
- Door overlay and pedestal or leg set required to complete the stove, sold separately
Product Features
Heating Performance for 1,000–2,700 Square Feet
Rated to heat 1,000 to 2,700 ft², the Gateway 3500 provides up to 110,000 BTU/h of maximum heat output from its 3.5 ft³ firebox and burns for up to 10 hours on a load of 22" logs, subject to installation and operating conditions.
EPA 2020 Certified Non-Catalytic Combustion
This non-catalytic stove meets the EPA 2020 standard with an average particulate emission rate of 1.6 g/h and includes secondary combustion as a standard feature.
Simple One-Lever Control
A single easy-to-use lever adjusts the burn rate, taking the fire from a roaring blaze to a slow burn without additional controls.
No-Mess Ash Pan
The easy-to-remove ash pan with cover keeps dirt and debris contained for mess-free disposal. The ash pan is supplied with the required pedestal or leg kit.
Air Wash System and Ceramic Glass Window
Hot air circulates across the 18 1/2" x 12 1/4" ceramic glass to keep dirt and debris from building up, maintaining a clear view of the fire through the single cast iron framed door.
Durable Steel Construction with Firebrick Lining
The 5/16" thick steel top is designed for extended heat radiation and lasting durability. High-density firebricks line the firebox for insulation, and a high heat ceramic baffle is built to perform at high temperatures.
Style Options to Suit Any Room
The Gateway 3500 is finished in metallic black and completed with your choice of a black or nickel door overlay and a pedestal, straight leg set, or Queen Anne leg set in black or nickel, with an optional step top add-on.
Certified Installation Versatility
The Gateway 3500 is approved for alcove installation and for mobile homes when installed in the pedestal version with the fresh air intake kit, according to the installation manual. An optional variable speed blower of up to 130 CFM can be added, with an optional quick connect thermodisc for automatic blower operation.
Configuration and Accessories
Per the Empire Stove 2026 price sheet, the Gateway 3500 requires a door overlay and a pedestal or leg set, which are sold separately. One door overlay and one base must be selected to complete the stove.
Required Components (Sold Separately)
| Component |
Part Number |
Description |
| Door overlay (choose one) |
WD3BL |
Door Overlay, Black |
| Door overlay (choose one) |
WD3NB |
Door Overlay, Nickel |
| Base (choose one) |
WP3BL |
Pedestal with Ash Pan, Black |
| Base (choose one) |
WLS3BL |
Leg Kit with Ash Pan, Straight, Black |
| Base (choose one) |
WLS3NB |
Leg Kit with Ash Pan, Straight, Nickel |
| Base (choose one) |
WLQ3BL |
Leg Kit with Ash Pan, Queen Anne, Black |
| Base (choose one) |
WLQ3NB |
Leg Kit with Ash Pan, Queen Anne, Nickel |
Optional Accessories (Sold Separately)
| Category |
Part Number |
Description |
| Accessory |
WT3BL |
Step Top Add-On |
| Accessory |
WB1V |
Blower, Variable Speed |
| Accessory |
WT1QC |
Thermodisc Kit, Quick Connect |
| Accessory |
WBS3BL |
Barrier, Black (Fire Screen) |
| Fresh air kit |
WA5PD |
Fresh Air Kit for Wood-Burning Stove on Pedestal |
Product Specifications
Appliance Performance
| Specification |
Value |
| Fuel Type |
Dry cordwood (16" recommended) |
| Recommended Heating Area |
1,000 – 2,700 ft² |
| Overall Firebox Volume |
3.5 ft³ |
| EPA Loading Volume |
2.88 ft³ |
| Maximum Burn Time |
10 h |
| Maximum Heat Output – Dry Cordwood |
110,000 BTU/h (32.2 kW) |
| Overall Heat Output Rate (Min. to Max.) |
17,200 BTU/h to 57,800 BTU/h (5.0 kW to 16.9 kW) |
| Average Overall Efficiency – Dry Cordwood (HHV) |
71% |
| Average Overall Efficiency – Dry Cordwood (LHV) |
76% |
| Optimum Overall Efficiency (LHV) |
77% |
| Optimum Heat Transfer Efficiency |
75% |
| Average Particulate Emission Rate |
1.6 g/h |
| Average CO Output |
73 g/h |
General Features
| Feature |
Specification |
| Combustion Technology |
Non-catalytic |
| Emissions Standard |
Meets EPA 2020 standard |
| Air Control |
Single lever |
| Ash Pan |
Yes, with cover (supplied with pedestal or leg kit) |
| Blower (CFM) |
Optional, up to 130 CFM (sold separately) |
| Door Type |
Single, glass with cast iron frame |
| Glass Type |
Ceramic glass, 5/32" thick |
| Glass Viewing Area (W x H) |
18 1/2" x 12 1/4" |
| Steel Thickness – Top |
5/16" |
| Steel Thickness – Body |
3/16" |
| Log Positioning |
East-west loading |
| Recommended Log Length |
16" |
| Maximum Log Length |
22" |
| Firebox Lined with Firebricks |
Yes, high-density |
| Baffle Type |
C-Cast high heat ceramic |
| Air Wash System |
Yes |
| Finish |
Metallic black |
| Warranty |
Empire Limited Lifetime Warranty (see schedule) |
Dimensions by Base Configuration
| Measurement |
Pedestal |
Straight Legs |
Queen Anne Legs |
| Overall Height (Floor to Top of Flue Collar) |
34" |
32 1/8" |
32 1/8" |
| Height to Stove Top |
32" |
30 1/8" |
30 1/8" |
| Base Footprint Width (Front View) |
26 1/4" |
28 1/2" |
27 3/4" |
| Base Footprint Depth (Side View) |
21 1/2" |
24 1/4" |
23 1/2" |
Stove Body, Door, and Firebox Dimensions
| Measurement |
Size |
| Overall Width |
28 1/8" |
| Stove Top Depth |
24 5/8" |
| Overall Depth (Side View) |
30 1/2" |
| Distance – Center of Flue Outlet to Side of Stove Top |
14 1/8" |
| Distance – Center of Flue Outlet to Back of Stove Top |
8 1/8" |
| Door Opening (Width) |
19" |
| Door Opening (Height) |
9 7/8" |
| Firebox Size (Width) |
22 7/8" |
| Firebox Size (Height) |
12 7/8" |
| Firebox Size (Depth) |
20 1/8" |
Dimensions are taken from the Empire Stove Gateway 3500 spec sheet and installation manual drawings. Shipping weight is not published by Empire Stove.
Venting and Chimney Requirements
| Specification |
Requirement |
| Flue Outlet Diameter |
6" |
| Recommended Connector Pipe Diameter |
6" |
| Type of Chimney |
ULC S629, UL 103 HT (2100 °F) |
| Minimum Chimney Height |
12' |
Certifications and Installation
| Category |
Standard |
| Emissions Standard |
EPA / CSA B415.1-10 |
| USA Standard (Safety) |
UL 1482, UL 737 |
| Canadian Standard (Safety) |
ULC S627 |
| Mobile Home Approved |
Yes, pedestal version only, with fresh air intake kit |
| Alcove Installation Approved |
Yes |
Minimum Clearances to Combustibles*
| Location |
Canada (Single Wall / Double Wall) |
USA (Single Wall / Double Wall) |
| Back Wall |
13 1/4" / 7" |
13" / 7" |
| Side Wall |
14" / 14" |
14" / 14" |
| Corner |
7 1/4" / 7" |
7 1/4" / 7" |
*The certification label on the appliance and the current installation manual supersede published dimensions and clearances. Always follow the manufacturer’s installation instructions and applicable local codes. Ceiling, lowered-ceiling, alcove, heat shield, step top, and mobile home clearances are specified in the installation manual.
Manufacturer Notes
- Recommended heating area and maximum burn time may vary with location in the home, chimney draft, heat loss factors, climate, fuel type, and other variables.
- Efficiency and emission figures are measured under the applicable certification test methods; see the installation and operation manual for details.
- A door overlay and a pedestal or leg set are required to complete the stove and are sold separately.
- Empire is committed to continuous product improvement; specifications may change without notice.
- Any installation must be done according to the data and drawings detailed in the installation and operation manual.
About the Manufacturer
Who Is Empire Stove?
Empire Stove is the wood-burning stove, insert, and fireplace line of Empire Comfort Systems, Inc. of Belleville, Illinois. Its Gateway wood stoves, Archway wood inserts, and St. Clair wood fireplaces are made in North America and share a one-lever air control, a no-mess ash pan, and an air wash system designed for simple everyday operation.
Built to Last
Empire Stove appliances are constructed with thick 5/16" steel, lined with high-density firebricks, and fitted with a high heat ceramic baffle and high temperature ceramic glass, and they are backed by the Empire Limited Lifetime Warranty.
Certification and Support
Current Empire Stove wood-burning models meet the EPA 2020 emissions standard. Empire publishes installation and operation manuals, spec sheets, brochures, and test reports for each model, and supports owners through online product registration and its authorized dealer network.
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