Introduction
This manual provides essential information for the installation, operation, and maintenance of the Napoleon W725-0025 SIT Nova Gas Valve. This component is a genuine replacement part designed specifically for natural gas (NG) applications in various Napoleon gas stoves and fireplaces. Please read these instructions thoroughly before proceeding with any installation or service.
Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information, consult a qualified installer, service agency, or the gas supplier.
- Installation and service must be performed by a qualified installer, service agency, or the gas supplier.
- Ensure the gas supply is turned off before any installation or maintenance procedures.
- Verify that the gas valve is compatible with natural gas (NG) only. Do not attempt to use this valve with propane (LP) gas.
- Check for gas leaks after installation using a non-corrosive leak detection solution.
- Always follow local codes and regulations for gas appliance installation.
- Keep the area around the appliance clear and free from combustible materials.
Package Contents
The package contains the following item:
- One (1) Napoleon W725-0025 SIT Nova Gas Valve (Natural Gas)

Image 1: The Napoleon W725-0025 SIT Nova Gas Valve shown in its original clear plastic packaging, with the Napoleon brand label visible.
Setup and Installation
Installation of this gas valve should only be performed by a qualified and certified gas technician or installer. Incorrect installation can lead to gas leaks, fire, explosion, or carbon monoxide poisoning.
- Preparation: Ensure the gas supply to the appliance is completely shut off and disconnected. Allow the appliance to cool down if it was recently in operation.
- Access: Gain access to the existing gas valve within your Napoleon gas stove or fireplace. This may involve removing panels or other components.
- Removal of Old Valve: Carefully disconnect all gas lines and electrical connections from the old valve. Note the orientation and connection points for proper reinstallation.
- Installation of New Valve: Position the new Napoleon W725-0025 SIT Nova Gas Valve in the same orientation as the old one. Connect the gas lines, ensuring all fittings are properly sealed with appropriate gas-rated sealant (e.g., pipe dope or Teflon tape). Connect all electrical wiring according to the appliance's wiring diagram.
- Leak Test: After all connections are made, slowly turn on the main gas supply. Apply a non-corrosive leak detection solution to all gas connections. Bubbles indicate a leak. If a leak is detected, immediately shut off the gas supply and tighten connections or reapply sealant until no leaks are present.
- Functionality Test: Follow the appliance's specific instructions for lighting the pilot and main burner to ensure proper operation of the new valve.

Image 2: A close-up top-down view of the Napoleon W725-0025 SIT Nova Gas Valve, highlighting the various ports and electrical connections.

Image 3: A side view of the Napoleon W725-0025 SIT Nova Gas Valve, featuring a red protective cap over one of the ports, indicating a factory seal or specific connection point.
Operating Instructions
The Napoleon W725-0025 SIT Nova Gas Valve controls the flow of natural gas to the pilot and main burner of your appliance. Its operation is typically integrated with the appliance's control system (e.g., thermostat, remote control, or manual switch).
- Pilot Light Ignition: Refer to your specific appliance's user manual for instructions on lighting the pilot light. The gas valve facilitates the flow of gas to the pilot assembly.
- Main Burner Activation: Once the pilot is established, the gas valve will allow gas to flow to the main burner when called for by the appliance's control system (e.g., turning on the fireplace switch or setting a thermostat).
- Shut-off: The valve will automatically shut off the gas supply to the main burner and/or pilot when the appliance is turned off or if a safety device (like a thermocouple/thermopile) detects an issue.
Always follow the operating instructions provided with your specific Napoleon gas stove or fireplace model.
Maintenance
The Napoleon W725-0025 SIT Nova Gas Valve is designed for reliable operation and generally requires minimal maintenance. However, periodic checks are recommended as part of overall appliance maintenance.
- Annual Inspection: It is recommended to have your gas appliance, including the gas valve, inspected annually by a qualified service technician.
- Leak Checks: Periodically check gas connections for leaks using a non-corrosive leak detection solution.
- Cleanliness: Ensure the area around the gas valve is kept clean and free from dust, debris, or obstructions.
- Component Integrity: During inspections, check for any visible signs of wear, damage, or corrosion on the valve body or connections.
Do not attempt to disassemble or repair the gas valve yourself. Contact a qualified service technician for any issues.
Troubleshooting
If your gas appliance is not functioning correctly, the issue may or may not be related to the gas valve. Always consult your appliance's specific troubleshooting guide first. Below are general troubleshooting steps related to gas flow:
- No Gas Flow:
- Ensure the main gas supply to the house and the appliance is turned on.
- Check for any tripped safety devices or pilot outages.
- Verify electrical connections to the gas valve are secure and receiving power.
- Pilot Light Not Staying Lit:
- This often indicates an issue with the thermocouple or thermopile, which signals the gas valve to stay open. Inspect these components for proper placement and function.
- Ensure the pilot flame is strong and engulfing the thermocouple/thermopile tip.
- Main Burner Not Igniting:
- Confirm the pilot light is lit and stable.
- Check the appliance's control settings (e.g., thermostat, wall switch).
- Inspect the igniter (if applicable) for proper operation.
If troubleshooting does not resolve the issue, contact a qualified service technician. Do not attempt complex repairs on the gas valve yourself.
Specifications
| Feature | Detail |
|---|---|
| Model Number | W725-0025 |
| Brand | Napoleon |
| Gas Type | Natural Gas (NG) |
| Material | Stainless Steel |
| Item Dimensions (L x W x H) | 5 x 2 x 6 inches |
| Item Weight | 2.48 pounds |
| Outlet Connection Type | NPT |
| Number of Ports | 2 |
| UPC | 629169725250 |
Compatible Napoleon Models
This Napoleon W725-0025 SIT Nova Gas Valve is compatible with the following Napoleon gas stove and fireplace models:
- B30 Ascent 30
- B35 Ascent 35
- B36 Ascent 36
- B42 Ascent 42
- B46 Ascent 46
- BGD36
- BGD36CF
- BGD36NTR
- BGD40
- BGD42
- BGD42CF
- BGD48
- BGNV36
- BGNV40
- GB20
- GD15
- GD16
- GD17
- GD25 (After Serial # 000852)
- GD27
- GD33
- GD36
- GD40
- GD45
- GD70
- StarFire Series 1S & -2S (After Serial # 10101)
- GD3200 (After Serial # 13023)
- GDI30
- GL 18/24/30
- GS3500
- GX36-1 Ascent X
Warranty and Support
For information regarding the warranty of your Napoleon W725-0025 SIT Nova Gas Valve, please refer to the documentation provided with your original Napoleon appliance or visit the official Napoleon website. For technical support, replacement parts, or service inquiries, please contact Napoleon customer service or an authorized Napoleon dealer.
Napoleon Contact Information: Please refer to the official Napoleon website or your appliance's user manual for the most current contact details.