Upgrade your old 40-gallon gas water heater effortlessly with the Rheem retrofit kit for a reliable 50-gallon electric solution.
Switching to a 50-gallon electric water heater is ideal for homeowners seeking efficiency and increased capacity. The Rheem AM39922-1 Water Heater Burner Assembly Kit offers seamless compatibility and superior durability, ensuring smooth installation and long-lasting performance. This retrofit kit helps you modernize your system while enjoying consistent hot water supply and energy savings.
Perfect for diverse household needs, this kit supports easy conversion from gas to electric, providing versatile use in various settings. Its user-friendly design and robust components deliver optimal safety and convenience for everyday use.
Read the full review to explore the key features, installation tips, and benefits of the Rheem retrofit kit. Learn how this upgrade can transform your water heating experience efficiently and effectively.


Rheem RG40S-40 Gas Burner Kit
Rheem AM39922-1 Water Heater Burner Assembly Kit – RG40S-40 Natural Gas: 12″ long, ABS plastic components, 2-year warranty.
Benefits
- Compatible retrofit solution for upgrading older 40-gallon gas models to 50-gallon electric systems.
- Durable construction with ABS plastic parts ensuring long-lasting performance.
- Easy installation designed to fit RG40S-40 natural gas models without extensive modifications.
- Improves energy efficiency by enabling transition to electric heating, potentially lowering fuel costs.
Drawbacks
- No dishwasher-safe parts, requiring manual cleaning and maintenance.
- Limited compatibility strictly for RG40S-40 natural gas models; not universal for all Rheem heaters.
- Installation may require professional assistance for users unfamiliar with gas and electric conversions.
A practical pick for homeowners looking to upgrade older gas water heaters to a more efficient 50-gallon electric system while maintaining reliable Rheem quality.
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Rheem Water Heater Pilot Igniter Kit
Water Heater Pilot and Igniter Replace Kit for Rheem/GE/Protech Smart Natural Gas Heater – 12″ long, ABS plastic components, 2-year warranty.
Benefits
- Compatible with multiple Rheem models including RHG PRO50-40F, 42V40F, and Professional Series units, ensuring broad usability.
- Reliable performance with quick and efficient ignition, addressing common issues such as damaged thermocouples and inlet leaks.
- Durable design built to withstand wear and tear, providing long-lasting stable hot water supply.
- Includes all necessary mounting kits and tools for straightforward installation, reducing downtime.
- Supports retrofit projects by replacing older 40-gallon gas models with upgraded 50-gallon electric systems when combined appropriately.
Drawbacks
- No dishwasher-safe parts; maintenance requires manual cleaning and care.
- Installation may require basic plumbing knowledge despite included tools, potentially necessitating professional assistance.
- ABS plastic components may be less resistant to extreme heat compared to metal alternatives.
A practical pick for homeowners upgrading or maintaining Rheem natural gas water heaters, particularly those replacing older 40-gallon gas units with newer 50-gallon electric models using retrofit kits. Ideal for ensuring reliable ignition and prolonging water heater lifespan in small to medium household setups.
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Combination Gas Control Kit NG
Combination Gas Control Replacement Kit – NG: Direct replacement for Rheem, Ruud, and Richmond gas water heaters; robust design; includes gas valve and installation instructions; 1-year limited warranty; OEM genuine factory authorized part.
Benefits
- Easy retrofit solution for older 40-gallon gas models aiming to upgrade to a 50-gallon electric system.
- OEM genuine part ensures compatibility and reliable performance with Rheem, Ruud, and Richmond water heaters.
- Robust construction enhances durability and longevity under regular use.
- Installation instructions included, simplifying the replacement process for experienced DIYers or professionals.
- 1-year limited warranty provides reasonable coverage and peace of mind.
Drawbacks
- Limited to gas water heater models; does not support direct electric conversion without additional components.
- 1-year warranty may be shorter than some competitors offering extended coverage.
- Installation may require professional assistance for users unfamiliar with gas control systems.
A practical pick for homeowners or technicians seeking a reliable, factory-authorized replacement gas control valve when retrofitting or maintaining Rheem, Ruud, or Richmond gas water heaters. Best suited for those upgrading or maintaining older 40-gallon gas units before transitioning to a larger 50-gallon electric setup.
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EWH-01 Electric Water Heater Kit
EWH-01 Electric Water Heater Tune-Up Kit: Includes two 4500W 240V copper heating elements with 13-9/16″ insert length, one upper and one lower Therm-O-Disc style thermostat, fits most water heaters 30 gallons and larger, compatible with Rheem and multiple s, 1-year warranty.
Benefits
- Compatible with a wide range of water heater s including Rheem, A.O. Smith, Whirlpool, GE, and more, ensuring easy retrofit for older 40-gallon gas models to 50-gallon electric systems.
- Dual element kit allows simultaneous replacement of upper and lower heating elements, reducing maintenance time and improving efficiency.
- Chromed coating on heating elements extends lifespan and resists corrosion better than standard elements.
- Therm-O-Disc thermostats offer reliable temperature control and can interchange with APCOM types, increasing versatility.
- High wattage elements (4500W, 240V) provide strong heating performance suitable for larger water heaters.
Drawbacks
- Only 1-year warranty may be shorter than some competitors, potentially requiring earlier replacement or service.
- Installation requires electrical knowledge since it involves switching from gas to electric heating elements and wiring thermostats correctly.
- Not all water heaters are compatible, so verifying exact model fit is necessary before purchase.
A practical pick for homeowners seeking a reliable retrofit kit to upgrade older 40-gallon gas water heaters to efficient 50-gallon electric models, especially when compatibility with multiple s is essential.
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Rheem RTGH-X Outdoor Vent Kit
Rheem RTGH-X Outdoor Vent Kit for High Efficiency Gas Tankless Water Heater: Compatible with Rheem RTGH-3 models, designed for outdoor installation, made of durable materials to withstand weather, easy assembly using a Phillips head screwdriver.
Benefits
- Facilitates outdoor installation of high-efficiency gas tankless water heaters, saving valuable indoor space.
- Reduces venting costs by enabling direct outdoor venting, eliminating the need for complex indoor vent systems.
- Easy assembly requiring only a Phillips head screwdriver, making installation faster and more convenient.
- Durable construction designed specifically to withstand outdoor environmental elements, ensuring long-lasting performance.
Drawbacks
- Designed only for specific Rheem RTGH-3 models, limiting compatibility with other tankless water heater s or older models.
- Installation requires outdoor placement, which may not be suitable for all home layouts or climates.
- No included installation hardware beyond basic screws, potentially requiring additional parts or professional assistance.
A practical pick for homeowners upgrading from older 40-gallon gas models to high-efficiency tankless systems needing reliable outdoor venting solutions, especially where indoor space is limited or venting costs are a concern.
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Faq about Rheem Water Heater Retrofit Kit:
1: What is a Rheem water heater retrofit kit?
A Rheem water heater retrofit kit is designed to upgrade older gas models, specifically to accommodate a 50-gallon electric water heater system.
2: Why should I replace my 40-gallon gas model?
Replacing a 40-gallon gas model with a 50-gallon electric model enhances efficiency, offers more hot water capacity, and reduces greenhouse gas emissions.
3: Is installation difficult?
Installation may require professional assistance, particularly if electrical work is involved. Follow the manufacturer’s instructions and local codes for safety.
4: Will my existing plumbing work with the retrofit kit?
Most existing plumbing can be adapted, but modifications may be necessary. Consult with a plumber to ensure compatibility.
5: Can I install the retrofit kit myself?
DIY installation is possible for those with experience, but hiring a licensed professional is recommended to ensure proper setup and compliance.
6: What are the benefits of switching to electric?
Electric water heaters typically have lower operating costs, require less maintenance, and offer quicker recovery rates compared to gas models.
Conclusion
The Rheem AM39922-1 Water Heater Burner Assembly Kit offers a reliable, direct replacement designed for natural gas units, ensuring seamless compatibility and efficient performance for older models. Its robust construction and ease of installation make it an excellent choice for maintaining existing gas systems without extensive modifications.
Alternatively, the Water Heater Pilot and Igniter Replace Kit provides a versatile solution compatible with multiple Rheem and GE models, enhancing ignition reliability and extending appliance lifespan. Ideal for those seeking a precise component upgrade, it addresses common pilot issues effectively. Ultimately, your decision hinges on whether you prioritize preserving gas functionality or transitioning to an upgraded electric setup.
