If you are looking for reliable gas valve options for home heaters, this guide highlights five well-suited choices. Each product is evaluated for safety, compatibility, and ease of installation. Best for professional installation, retrofit projects, or upgrade to improve control and efficiency, these valves cover a range of heater types and applications. Use this overview to compare compatibility with common gas types and cavity sizes, and to identify which valve best fits your heater model and installation needs.
| Product | Best For | Cavity/Outlet Notes | Limitations |
|---|---|---|---|
| Reliance Water Heater Natural Gas Control Valve 100112336 | Professional installations for Reliance, A.O. Smith, and similar water heaters | Standard cavity; compatible with common water heater configurations | Professional installation recommended; warranty may require it |
| WV8840B1158 – OEM Upgraded Water Heater NG Gas Valve | OEM replacement for compatible models; easy upgrade | 2″ cavity, direct replacement for WV8840B1158 | Ensure compatibility with your model |
| Reliance water heater gas control valve 100112336 (WT8840B) | Resideo/Honeywell-based systems; 160°F rated variants | 1″ cavity included in listed variants | Verify temperature rating applies to your heater |
| Robertshaw 710-502 Millivolt Gas Valve | Compact space heaters and low-profile installations | Three-position outlets; 1/2″ and 1/4″ pilots | May require specific electrical/millivolt setup |
| Stanbroil Low Pressure Propane Gas Flame Failure Safety Valve Kit | Gas fireplaces, fire pits, and heaters needing flame-failure protection | 3/8″ flare threaded connections; low-pressure up to 1/2 PSI | Propane-focused; ensure fuel type compatibility |
Note: The following sections describe each product with clear, objective details to help you choose the best option for your heater. Each entry also notes who it is best for and any practical limitations observed from the listed features.
Reliance Gas Control Valve 100112336 (Thermostat Compatible)
Best for full Reliance and compatible brands, this gas control valve integrates with standard thermostat controls used by many water heaters. It’s intended for professional installation and may affect warranties if installed by non-professionals. The product adds value by providing a reliable control solution, but warrants professional handling due to safety concerns. Best for homeowners upgrading in a professional setting who need compatibility with A.O. Smith, Reliance, State, and American-branded heaters. Caution: this valve should be installed by a pro to avoid warranty or safety issues.
ClimaTek WV8840B1158 OEM NG Gas Valve
Better for direct OEM replacement needs, this valve is advertised as an OEM upgraded part that directly replaces WV8840B1158. It is designed for gas water heaters with a 2″ cavity and is positioned as built to last. Best for technicians or confident homeowners performing valve swaps where exact OEM compatibility matters. Limitation: confirm model compatibility with your heater before purchasing, as mis-match can affect operation.
Reliance 100112336 Trade WT8840B Valve
Suitable for Reliance and similar control systems, this valve variant operates in a 1″ cavity and features a temperature rating around ambient to 60°C. Best for systems needing a standard control valve with reliable activation and compatibility with Resideo/Honeywell-based components. Caution: verify cavity size and compatibility with your specific heater model before ordering.
Robertshaw 710-502 Millivolt Gas Valve
Best for compact space heater installations, this valve is designed with a low-profile form factor and a broad electrical range (250 mV to 750 mV) suitable for various gas types. It includes a three-position outlay with standard NEMA terminals and a pilot inlet. Choose this if you need flexibility in low-visibility spaces and multiple gas options. Limitation: may require specific millivolt wiring and setup depending on the heater.
Stanbroil Low Pressure Propane Valve Kit
Best for propane-fired fireplaces, fire pits, and heaters requiring flame-failure safety. It includes a control valve, thermocouple, and a knob, with 3/8″ flare thread connections and a maximum BTU rating of 50,000. Choose this if propane fuel is used and flame safety is a priority. Limitation: designed for low-pressure propane systems; ensure your installation matches these specifications.
Buying Guide: Key Factors to Consider
What type of heater do you own? Valves are designed for water heaters, fireplaces, or space heaters with specific cavity sizes and fuel types. Identify your fuel (natural gas or propane) and verify compatibility with your heater’s control system and manufacturer’s guidelines. Consider the following:
- Fuel Type: Natural gas vs. propane. Choose valves rated for your fuel to ensure safe operation.
- Cavity Size and Threading: Confirm the cavity dimension (1″ or 2″ as listed) and the thread type (3/8″ flare, 1/2″ etc.).
- Electrical Compatibility: Millivolt vs. electronic controls; ensure wiring matches your system.
- Professional Installation: Many valves require professional installation to maintain warranty and safety compliance.
- OEM vs. Aftermarket: OEM replacements are designed for exact fit; aftermarket options may vary in fit and performance.
Frequently Asked Questions
- What is a gas valve for a heater?
A gas valve controls the flow of gas to the burner’s pilot or main burner, regulating flame and heat output. It is a critical safety component in gas-powered heaters.
- Do I need a professional to install a gas valve?
Yes. Installation involves gas connections and venting considerations where improper setup can pose safety risks and affect warranties.
- Can I replace a gas valve by myself?
Only if you are qualified; otherwise, hire a licensed technician to avoid hazards and warranty issues.
- Will a valve’s compatibility with my heater be clearly listed?
Yes. Check model numbers, cavity size, and fuel type compatibility before purchasing.
- What should I do if the valve does not fit after purchase?
Contact the seller or manufacturer for a return or exchange based on the product’s compatibility guarantees.