Best Millivolt Gas Valve Options for Fireplaces in the U.S.
The following guide highlights five top millivolt gas valves commonly used in residential fireplaces, stoves, and gas logs. Each product supports natural gas millivolt systems and direct-vent configurations, with varying compatibility across brands. This article compares features, compatibility, and installation notes to help you choose a suitable replacement valve. Inline links take you to the official Amazon product pages for each item.
| Product | Brand | Key Feature | Link |
|---|---|---|---|
| Robertshaw 710-502 | Robertshaw | Low-profile, versatile 250–750 mV range | Amazon |
| SIT 820 Nova 0820652 | Allparts Equipment & Accessories | Direct vent, adjustable flame | Amazon |
| SIT-820 Nova 0820652 (Replacement Model) | Allparts Equipment & Accessories | Wide compatibility, quick drop-out pilot | Amazon |
| Durablow DV970A-NG | Durablow | CSA certified, natural gas only | Amazon |
| Americangaslogs Millivolt Valve | Americangaslogs | Power by pilot and thermopile, no electricity | Amazon |
Robertshaw 710-502 Millivolt Valve
The Robertshaw 710-502 is designed for low-capacity space heater applications and B-67 valve replacements. Its millivolt control accepts a broad electrical rating range from 250 mV to 750 mV, enabling compatibility with multiple gas types including natural, manufactured, mixed, and LP gas/air mixtures. The valve features a three-position 1/2-inch outlet, a 1/4-inch pilot outlet tubing, standard NEMA terminals, a gas cock dial with off-pilot-on markings, and an inlet filtered screen. This compact, RoHS-compliant unit aims to fit limited spaces while delivering reliable flame control when used in direct-vent or vented fireplaces. Installation should follow local codes and the manufacturer’s guidelines to ensure safe operation and proper alignment with pilot and thermopile systems.
SIT 820 Nova 0820652 Natural Gas Valve
Designed for natural gas direct-vent applications, the Sit-820 Nova 0820652 is an OEM-compatible component with broad brand compatibility, including Majestic, Monessen, IHP, Lennox, Empire, and Napoleon Empire fireplaces and gas logs. It offers adjustable flame control to tailor ambiance and features a quick drop-out pilot circuit for safety when the pilot is low. The valve is CSA-US compliant, underscoring safety and reliability in residential direct-vent installations. This valve is suitable for replacing multiple Sit-820 variants and similar 820 Nova models across several brands, making it a versatile choice for direct-vent gas fireplaces and stoves.
SIT-820 Nova 0820652 Replacement Model
This 0820652 variant is a direct replacement for multiple models and offers wide compatibility with brands that use the 3/8-inch NPT inlet/outlet. It includes adjustable flame control and a quick drop-out circuit to enhance safety in low-pilot scenarios. Its design focuses on direct-vent fireplaces, stoves, and gas logs, where millivolt operation is essential to avoid dependence on household electricity. The product supports a broad ecosystem of replacement parts and cross-reference valves, simplifying retrofits for older fireplace systems.
Durablow DV970A-NG Millivolt Valve
The DV970A-NG is a natural gas-only valve, CSA certified, with a rating up to 225°F and measured at 3-13/16 inches high, 4-21/32 inches long, and 1-29/32 inches wide. It emphasizes adherence to manufacturer directions and local codes during installation. With cross-reference compatibility including 200-D, 6003, B-67, and other models, this valve targets a broad range of Dexen, Robertshaw, HHT, Empire, and other brands. Made in Taiwan, it is positioned as a durable, OEM-like option for retrofits where direct-vent millivolt control is required.
Americangaslogs Millivolt Valve
Americangaslogs’ valve provides a natural gas direct-vent solution designed as a practical alternative to SIT-0820652 variants. It operates on pilot flame and thermopile with no reliance on household electricity, ensuring continued function during power outages. Its precision valve core enables smooth flame control from low to high, reducing flame noise and incomplete combustion. This valve focuses on compatibility with common natural gas direct-vent fireplace systems and aims to deliver reliable performance for standard direct-vent installations.
Buying Guide: Key Purchase Considerations
- Gas type and direct-vent compatibility: Most millivolt valves are designed for natural gas and direct-vent configurations. Verify the valve is rated for natural gas and is compatible with your direct-vent fireplace or stove.
- Millivolt range and flame control: Check the electrical (mV) range the valve accepts and whether it supports adjustable flame height. A broader mV range typically means wider compatibility with different thermopiles and pilots.
- Brand compatibility and cross-reference: Many units list compatibility with brands like Majestic, Monessen, Lennox, Empire, Napoleon, and others. If you replace an old valve, confirm cross-reference cross-compatibility to avoid fitment issues.
- Safety features: Look for quick drop-out pilot circuits, automatic shut-off, restart interlocks, and flame sensing capabilities to enhance safety in the event of pilot issues.
- Installation and codes: Ensure installation follows manufacturer directions and adheres to local codes. Some valves require professional installation to guarantee safe operation.
- Physical dimensions and connections: Confirm inlet/outlet sizes (commonly 3/8-inch NPT) and overall dimensions to ensure a proper fit within the existing burner housing and plenum.
- Durability and materials: CSA or CSA-US certifications, RoHS compliance, and build quality influence long-term reliability in a residential setting.
Across these options, buyers should assess the existing system’s brand compatibility, the required flame control, and the specific direct-vent configuration. While some valves emphasize broad cross-brand compatibility, others prioritize straightforward installation and safety features. Selecting a model that matches the original valve’s electrical characteristics and pilot design will help maintain efficient and safe fireplace operation.