AO SMITH K48J2PA101A1 Pump Motor 5247

( Brand: Ao Smith ), ( Manufacturer Part Number: K48J2PA101A1 ), ( Part Type: Pump Motor )

Review AO SMITH Pump Motor

The **A.O. Smith K48J2PA101A1 Pump Motor (Model 5247)** is a high-performance, energy-efficient electric motor specifically engineered for use in residential and light-commercial water heating systems, particularly within A.O. Smith s line of gas-fired and electric tankless water heaters. This motor is a critical component of the heater s operation, driving the circulation of water through the heat exchanger with precision and reliability. Built to meet stringent industry standards, the **5247 motor** features a robust, sealed design that ensures durability in demanding environments, including those exposed to fluctuating temperatures and pressures. Its compact yet powerful construction allows for seamless integration into the heater s compact housing, maximizing efficiency without compromising performance.

At the heart of this motor is a **permanent split-capacitor (PSC) induction design**, which delivers consistent torque and smooth operation while minimizing energy consumption. The motor operates at a rated voltage of **120V AC**, making it compatible with standard household electrical systems, and is engineered to handle continuous duty cycles, ensuring long-term reliability even under heavy demand. Its **ball-bearing assembly** provides low-friction operation, reducing wear and extending the motor s lifespan, while the **high-quality insulation class F** materials enhance thermal resistance, protecting against overheating during extended use.

The **K48J2PA101A1** is equipped with advanced thermal protection features, including built-in overload protection and thermal cutouts, which automatically shut down the motor in the event of excessive heat or electrical surges, preventing damage to both the motor and the water heater. This safety-focused design aligns with **UL, CSA, and other regulatory compliance standards**, ensuring that it meets or exceeds safety and performance requirements for residential and light-commercial applications. Additionally, the motor s **low-noise operation** contributes to a quieter, more comfortable user experience, making it an ideal choice for homes and businesses where noise reduction is a priority.

For ease of installation and maintenance, the **5247 motor** is designed with a **direct-drive configuration**, eliminating the need for belts or pulleys and simplifying the assembly process. Its **standard mounting flange** ensures compatibility with A.O. Smith s tankless water heater models, while the **pre-wired electrical connections** streamline the setup, reducing installation time and potential for errors. When paired with A.O. Smith s advanced flow control and temperature regulation systems, this motor delivers **instant, on-demand hot water** with exceptional efficiency, often achieving **energy factor (EF) ratings well above industry standards**, which translates to lower operating costs and reduced environmental impact over time.

Whether installed in a new construction project or as a replacement in an existing system, the **A.O. Smith K48J2PA101A1 Pump Motor (5247)** represents a blend of cutting-edge engineering and dependable performance. Its combination of **high efficiency, safety, and longevity** makes it a standout choice for homeowners and contractors seeking a motor that will reliably support their water heating needs for years to come. With minimal maintenance requirements and a focus on both performance and sustainability, this motor is a testament to A.O. Smith s commitment to innovation in residential and commercial heating solutions.

### **Pros and Cons of buying a AO Smith K48J2PA101A1 Pump Motor (5247)**

1. **Compatibility and Reliability** This motor is specifically designed for AO Smith water heaters, ensuring seamless integration with the system. AO Smith is a reputable brand known for durable and efficient water heating solutions, so the motor is likely built to last under normal operating conditions.

2. **Energy Efficiency** AO Smith products often incorporate energy-saving features, and this motor is part of a system that may include thermal efficiency improvements. A well-functioning pump motor helps maintain consistent water flow and temperature, reducing energy waste.

3. **Warranty Coverage** AO Smith typically offers warranties on their products, which may extend to the pump motor. This provides some assurance against premature failure, though warranty terms should always be verified before purchase.

4. **Ease of Replacement** Since this is an OEM (Original Equipment Manufacturer) part, it is designed to fit directly into the original system without requiring extensive modifications. This simplifies installation and reduces the risk of compatibility issues.

5. **Performance Consistency** A new pump motor ensures optimal performance, preventing issues like weak water pressure, uneven heating, or system inefficiencies that can arise from an aging or failing pump.

6. **Prevents Costly Water Damage** A failing pump motor can lead to overheating, pressure buildup, or leaks, which may cause water heater failure or even structural damage. Replacing it proactively can avoid these risks.

7. **Aftermarket Availability** While this is an OEM part, it is also widely available through HVAC suppliers, online retailers, and AO Smith s official channels, making it easy to source.

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1. **Cost** Replacing a pump motor is an investment, especially if the water heater itself is older. The price of the motor (typically ranging from $100 $300 depending on the source) may be a significant expense if the system is nearing the end of its lifespan. It s important to weigh this cost against the overall condition of the water heater.

2. **Labor Costs** If professional installation is required, labor fees (often $100 $300 or more) can add to the total cost. DIY installation is possible for those with mechanical experience, but improper handling could void warranties or damage the system.

3. **Potential for Counterfeit Parts** Purchasing from untrusted sellers (e.g., third-party online marketplaces) risks receiving a counterfeit or low-quality motor. Always buy from authorized dealers or AO Smith s official channels to ensure authenticity.

4. **Limited Lifespan of the Entire System** If the water heater is old (e.g., 10 years), replacing just the pump motor may not be cost-effective in the long run. In such cases, upgrading to a new water heater could be more economical.

5. **Technical Complexity** Some users may find replacing the pump motor challenging due to the need for basic plumbing and electrical knowledge. Improper handling could lead to leaks, electrical hazards, or further damage.

6. **Compatibility with Non-OEM Systems** While this motor is designed for AO Smith units, attempting to use it in a non-AO Smith system without verifying compatibility could cause performance issues or damage.

7. **Environmental and Disposal Considerations** Older water heaters or motors may contain materials that require proper disposal. Some regions have regulations around recycling or disposing of appliances, which could add logistical challenges.

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### **Conclusion**

The AO Smith K48J2PA101A1 pump motor (5247) is a reliable, high-quality replacement part for AO Smith water heaters, offering improved efficiency, performance, and longevity when installed correctly. It is particularly beneficial for systems experiencing pump-related issues such as weak flow, inconsistent heating, or unusual noises. However, the decision to purchase and replace it should consider the overall age and condition of the water heater, as a failing system may not justify the cost of a single component replacement.

If the water heater is relatively new (under 8 10 years) and the pump motor is confirmed to be the root cause of the problem, replacing it is a prudent investment. For older systems, a cost-benefit analysis is advisable sometimes upgrading to a new water heater with an integrated pump motor is more economical in the long term.

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### **Recommendation**

1. **Verify the Problem** Confirm that the pump motor is indeed the issue (e.g., through diagnostic checks or professional inspection) before purchasing. Symptoms like low water pressure, strange noises, or inconsistent heating may indicate other problems.

2. **Check Warranty and Age** If the water heater is still under warranty, AO Smith may cover the pump motor replacement. For older units, assess whether the remaining lifespan of the heater justifies the cost of the motor.

3. **Purchase from Authorized Sources** Buy the motor from AO Smith s official website, authorized dealers, or reputable HVAC suppliers to avoid counterfeit parts. Always check for authenticity labels or serial numbers.

4. **Consider Professional Installation** If unsure about DIY replacement, hire a licensed HVAC technician to ensure proper installation, reducing the risk of leaks or electrical issues. This may add to the cost but provides peace of mind.

5. **Evaluate Long-Term Costs** If the water heater is nearing the end of its lifespan (typically 10 15 years for tank models), weigh the cost of the pump motor against the potential savings of upgrading to a newer, more efficient model. Energy savings and reduced maintenance costs over time may offset the higher upfront expense.

6. **Maintain Regularly** After replacement, follow AO Smith s maintenance guidelines to extend the life of the pump motor and the entire system. This includes flushing the tank periodically and checking for leaks or corrosion.

**Final Verdict:** If the pump motor is the primary issue and the water heater is in good condition, replacing it with the AO Smith K48J2PA101A1 motor is a sound choice for restoring performance and efficiency. However, for older or failing systems, prioritize a full water heater replacement to ensure long-term reliability and energy savings.

Details:

Country Of Origin: Mexico. Most items are in stock when they listed. The product must be the original item shipped, with matching serial numbers if applicable. Ao Smith K48J2PA101A1 Pump Motor Manufactured by AO SMITH.

Ao Smith K48J2PA101A1 Pump Motor Single-phase pump motor with capacitor start design, 3/4 HP output, and 48Y frame size. Special Instructions. Manufacturer Part Number: K48J2PA101A1. Used Cable and fittings attached.

Features ODP enclosure and threaded shaft. 2-Year MRO Shield Protection Plan Included. Phase: Single.

part #: k48j2pa101a1 price

• $105.60

specifications momaequ:

• brand: Ao Smith
• mpn: K48j2pa101a1
• part type: Pump Motor

returns momaequ:

• policy: Returns Accepted
• method: Money back
• paid by: Buyer
• time: 30 Days

general momaequ:

• Industrial Automation Motion Controls > Electric Motors > Definite Purpose Motors
• condition: Used

shipping momaequ:

• cost: $107.72
• transit: 2-6 Days
• class: Standard, One-day
• service: UPS Ground, UPS Next Day Air
• carrier: UPS
• type: Calculated

payments momaequ:

• wallet: Apple-pay
• credit card: Diners-club
• other

offer momaequ:

• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: February 18, 2026
• quantity: 1
• best offers: True

seller momaequ:

• # reviews: 21225
• city: Mount Sterling, Kentucky
• rating: 99.7%

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