
FP-21 Comparison
| photo | price | summary | rating |
|---|---|---|---|
![]() | $174.50 | Condition is New, Rheem FP-21 Conversion Kit LP to Natural Gas, FREE SHIPPING | ![]() |
![]() | $192.81 | Condition is New, RHEEM 185607 /Protech - Conversion Kit - /Ruud/Protech - A complete, FREE SHIPPING | 98.7% |
![]() | $244.48 | Condition is New, Rheem-Ruud FP-21 LP CONVERSION KIT, FREE SHIPPING | 99.7% |
![]() | $300.56 | Condition is New, Rheem FP-21 Liquid Propane (LP) Conversion Kit, FREE SHIPPING | 100.0% |
![]() | $304.95 | Top Pick! Condition is New, FP-21 Rheem Lp Conversion Kit OEM FP-21, shipping cost = $15.95 | 99.7% |

The Rheem FP-21 LP Conversion Kit is a valuable solution for those looking to convert their existing Rheem natural gas water heater to run on propane fuel. This conversion kit is designed specifically for Rheem FP-21 series water heaters, ensuring a seamless and efficient transition between fuel types.
The conversion kit comes with essential components required for the conversion process. These include a new propane burner, a vent kit, and necessary safety parts such as a draft diverter and a thermal expansion relief valve. The propane burner is engineered to deliver optimal performance, ensuring that your water heater continues to operate efficiently and effectively after the conversion.
The vent kit is designed to accommodate the change in fuel type, allowing for the safe and efficient venting of exhaust gases produced during the combustion process. The draft diverter ensures proper draft conditions for the safe and efficient operation of the water heater, while the thermal expansion relief valve helps maintain the pressure balance within the system, preventing damage to your water heater or potential safety hazards.
Installing this conversion kit requires some basic plumbing and electrical knowledge, as well as familiarity with the specific water heater model. The conversion process involves disconnecting the existing natural gas connections and installing the new propane components. Detailed instructions are included with the kit to guide you through the process. It is strongly recommended that you consult with a professional plumber or a certified gas technician for the installation to ensure safety and proper functionality.
The Rheem FP-21 LP Conversion Kit is an essential accessory for Rheem FP-21 series water heater owners who find themselves in a situation where they need to switch from natural gas to propane fuel. The conversion kit not only ensures the continued functionality of the water heater but also provides peace of mind, knowing that your water heater is operating safely and efficiently with the appropriate fuel source.
The Rheem FP-21 LP Conversion Kit is designed to allow the conversion of a Rheem electric water heater to a propane gas water heater. Here are some potential pros and cons that may help you decide whether this conversion kit is suitable for your needs:
Pros:1. Cost Savings: Propane is often less expensive than electricity, especially in areas where electricity rates are high. Installing this conversion kit can help you save money on your energy bills in the long run.
2. Reliability: Propane water heaters can be more reliable than electric water heaters, as they do not rely on electricity to function. This can be particularly important for households that experience frequent power outages.
3. Energy Efficiency: Propane water heaters can be more energy-efficient than electric water heaters, as they produce more heat per unit of fuel. This can help you save money on your energy bills and reduce your carbon footprint.
4. Versatility: The Rheem FP-21 LP Conversion Kit can be used with a variety of Rheem water heaters, making it a versatile option for those who already own a Rheem electric water heater.
Cons:1. Cost of Conversion: Installing a conversion kit, such as the Rheem FP-21 LP Conversion Kit, can be costly. You will need to factor in the cost of the conversion kit itself, as well as the cost of any necessary modifications to your existing water heater or gas line.
2. Complexity: Installing a conversion kit can be a complex process, particularly if you are not experienced in plumbing or gas work. You may need to hire a professional to ensure that the conversion is done safely and effectively.
3. Safety Concerns: Converting an electric water heater to a propane gas water heater involves working with both electricity and gas, which can be dangerous if not done properly. It is essential to ensure that all safety precautions are taken during the conversion process to minimize the risk of accidents.
4. Limited Warranty: The Rheem FP-21 LP Conversion Kit comes with a limited warranty, which may not cover all potential issues that may arise during the conversion process. It is essential to carefully review the terms of the warranty before making a purchase.
Conclusion:The Rheem FP-21 LP Conversion Kit can be a useful option for those looking to convert their existing Rheem electric water heater to a propane gas water heater. While there are some potential benefits to this conversion, such as cost savings, reliability, and energy efficiency, there are also some drawbacks, such as the cost of conversion, complexity, safety concerns, and limited warranty. Ultimately, whether the conversion kit is suitable for your needs will depend on your individual circumstances, including your budget, experience level, and energy requirements. If you are unsure about whether a conversion is right for you, it may be worth considering other options, such as purchasing a new propane water heater or exploring alternative energy sources.
Recommendation:If you have decided that a conversion is the best option for your needs, it is essential to ensure that you take all necessary safety precautions during the installation process. This may involve hiring a professional plumber or gas fitter to install the conversion kit, as well as following all manufacturer instructions carefully. Additionally, be sure to review the terms of the warranty carefully and consider investing in additional insurance or protection plans to minimize the risk of potential issues. Finally, be prepared for the initial cost of the conversion, as it can be a significant investment. However, if you are able to save money on your energy bills over time and enjoy the benefits of a more reliable and energy-efficient water heater, the investment may be worthwhile.
Details:
Fp-21 Rheem lp conversion kit oem.
specifications centrafurn:
- brand: Rheem
- mpn: Fp-21
- type: Appliance Part
- modelsfits: All Heating, Cooling And Hvac Parts Are Model Specific. We Can He
- california prop 65 warning: Warning
general centrafurn:
- category: Home & Garden > Heating, Air > Cooling Systems > Central Furnaces
returns centrafurn:
- policy: no returns
seller centrafurn:
- # reviews: 490
- city: hornell, new york
- rating: 100.0%
shipping centrafurn:
- class: standard
- service: usps ground advantage
- type: fixed
- transit: 3-8 days
- carrier: usps
payments centrafurn:
- wallet: paypal
- other
- credit card: visa
offer centrafurn:
- in stock #: 5
- sold #: 10
- availability: in stock
- started: december 2, 2025
- options: ship-to-home
- prices: $174.50–$304.95
- item condition: New
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