Introduction
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your Weber SPIRIT S-425 Natural Gas Grill. Please read this manual thoroughly before assembly or operation to ensure proper use and to prevent injury or damage.

Image: Front view of the Weber Spirit S-425 Natural Gas Grill, showcasing its stainless steel finish and control panel.
Safety Information
Always adhere to local codes and regulations for gas appliance installation. Failure to do so may result in fire, explosion, or serious injury.
- Ensure the grill is connected only to a natural gas supply. Do not attempt to connect to bottled gas or liquid propane.
- Operate the grill outdoors only, in a well-ventilated area.
- Keep combustible materials away from the grill.
- Do not store flammable liquids or vapors near the grill.
- Always keep children and pets away from the hot grill.
- Do not leave the grill unattended while in use.
- Wear protective gloves when handling hot components.
Setup and Assembly
The Weber SPIRIT S-425 grill requires assembly. Follow the detailed instructions provided in the separate assembly guide for proper construction. Ensure all components are securely fastened before connecting to the gas supply.
Natural Gas Connection
- Ensure the natural gas supply line is turned off at the source.
- Connect the grill's flexible gas hose to the natural gas supply outlet. Use appropriate tools to ensure a tight, leak-free connection.
- Perform a leak test: Apply a soapy water solution to all connections. Bubbles indicate a leak. If a leak is detected, turn off the gas, tighten connections, and retest. Do not operate the grill if a leak persists.
- Once connections are secure and leak-free, slowly turn on the natural gas supply.

Image: Side view of the Weber Spirit S-425 Natural Gas Grill, showing the side tables and the gas hose connection point.
Operating Instructions
Ignition
- Open the grill lid before lighting.
- Turn the first burner knob (typically the far left) to the HIGH position.
- Press and hold the Snap-Jet Ignition button until the burner ignites. You should hear a clicking sound and see a flame.
- Once the first burner is lit, turn on the remaining burners to the desired setting.
- Close the lid and preheat the grill for 10-15 minutes, or until the desired temperature is reached.
Temperature Control and Sear Zone
The grill features individual burner controls for precise temperature management. The two red Boost Burner knobs activate the Sear Zone, providing 40% more power for intense searing.
- For general grilling, adjust burner knobs to achieve desired heat.
- To use the Sear Zone, turn the two red Boost Burner knobs to the HIGH position. Allow the grill to preheat with the Sear Zone active for a few minutes before placing food.

Image: A hand adjusting one of the control knobs on the Weber Spirit S-425 grill, demonstrating the ease of temperature control.
Using Accessories
The Weber SPIRIT S-425 is compatible with various Weber Works snap-on accessories and Weber Crafted grillware (sold separately) to expand your cooking capabilities.
- Warming Rack: Use the warming rack to keep cooked food warm, toast buns, or grill smaller, delicate items.
- Weber Works Side Rails: Attach compatible accessories like tool hooks or bottle holders to the side rails for added convenience.
- Weber Crafted Grillware: Transform your grill into a griddle, pizza oven, wok, or Dutch oven by adding a Weber Crafted frame kit and custom-fit inserts.

Image: Two steaks and various vegetables cooking on the grill grates, demonstrating the grill's cooking capacity and the effectiveness of the Sear Zone.

Image: Burgers with melting cheese cooking on a griddle insert, showcasing the versatility of the grill with optional accessories.

Image: A freshly baked pizza being removed from a pizza stone on the grill, illustrating the grill's capability as a pizza oven with the right accessories.
Maintenance and Cleaning
Regular cleaning and maintenance will extend the life of your grill and ensure optimal performance.
Grease Management System
The grill features a Grease Management System with a large drip pan and a removable grease tray. This system funnels grease away from the burners to prevent flare-ups and makes cleaning easy.
- Regularly check and empty the grease tray. Allow it to cool completely before handling.
- Clean the drip pan as needed to prevent grease buildup.
Grates and Flavorizer Bars
- Cooking Grates: After each use, while the grates are still warm, brush off any food residue with a grill brush. For deeper cleaning, remove the grates and wash with warm soapy water.
- Flavorizer Bars: These stainless steel bars vaporize drippings, enhancing flavor and protecting burners. Periodically scrape off any accumulated debris with a plastic scraper.
Exterior Cleaning
- Wipe down stainless steel surfaces with a stainless steel cleaner and a soft cloth.
- Clean painted surfaces with mild soap and water.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Burner not lighting | No gas supply; clogged burner port; faulty igniter. | Check gas supply valve; clean burner ports; contact customer support for igniter issues. |
| Low flame or uneven heat | Low gas pressure; partially clogged burner; spider webs in venturi tubes. | Ensure full gas supply; clean burner ports; clear venturi tubes. |
| Excessive flare-ups | Grease buildup; high fat content in food. | Clean grease management system; trim excess fat from food; use indirect heat for fatty foods. |
If issues persist after attempting these solutions, please contact Weber customer support.
Specifications
| Feature | Detail |
|---|---|
| Brand | Weber |
| Model Name | Spirit |
| Model Number | S-425 |
| Fuel Type | Natural Gas |
| Product Dimensions (D x W x H) | 26.6"D x 51.8"W x 46.2"H |
| Item Weight | 102.5 Pounds |
| Main Burner Count | 4 |
| Heating Power | 19000 British Thermal Units |
| Cooking Surface Area | 428 Square Inches |
| Material | Stainless Steel (Grill), Metal (Frame) |
| Included Components | Thermometer |
| Assembly Required | Yes |
Warranty and Support
The Weber SPIRIT S-425 Natural Gas Grill comes with a 10-year limited warranty. This warranty covers defects in material and workmanship under normal use and maintenance.
For warranty claims, technical assistance, or replacement parts, please contact Weber customer support. Have your model number (S-425) and proof of purchase ready when contacting support.
You can find contact information for Weber customer support on their official website or through the retailer where you purchased the grill.





