You flip the switch and hear a low hum from your well pump, but no water flows. The motor tries to start, fails, and the circuit breaker trips. This classic symptom points to a worn-out start capacitor. For homeowners with a shallow well pump, replacing the capacitor is often a simple, low-cost fix that restores water pressure without replacing the entire pump. In this guide, we review four top-rated replacement capacitors designed for Franklin control boxes, covering everything from capacitance ratings to build quality. Whether you own a 1/2 HP or a 2 HP pump, you will find a capacitor that fits your system. For a deeper understanding of pump sizing, check out our guide on what pump you need for your well.
Pros
- Matches Franklin part #275464118 as a direct replacement.
- Well rated by customers at 4.6 out of 5 stars.
- Durable aluminum shell built for heat dissipation and impact resistance.
- Easy installation using existing control box mounting hardware.
- Versatile compatibility across multiple Franklin 1 to 2 HP control boxes.
Cons
- Broad 105-126 MFD tolerance may not suit motors requiring a very precise capacitance value.
- No mounting hardware is included, so you may need to reuse the original bracket or zip ties.
- Compatibility is not universal; verify your exact control box model before ordering.
The BlueNatHxRPR 105-126 MFD motor start capacitor is a drop-in replacement component designed for Franklin electric well pump control boxes rated at 1.0, 1.5, and 2 HP. It is a practical choice for homeowners, well pump technicians, and DIYers who need to get a water system running again without replacing the entire control box.
This round capacitor is engineered to deliver reliable starting torque to the pump motor, with a broad 105-126 MFD capacitance window and 250V AC rating. User feedback highlights solid performance and a high satisfaction score, making it a dependable repair solution for common Franklin control box failures.
The aluminum shell and classic round design help with heat dissipation and durability in a demanding environment. It measures 3.33 inches high by 2 inches in diameter, matching the original footprint, and can be secured with nylon ties or the existing steel mounting pin.
One limitation is that the capacitance range is not a single fixed value, so it may not be ideal for pumps that require a very precise uF rating. Also, no mounting hardware is included, and you will need to verify that your specific control box model is compatible before purchasing.
For most Franklin 1.0, 1.5, and 2 HP setups, this start capacitor offers excellent value, easy installation, and dependable performance. If you need a straightforward replacement for a failed well pump start capacitor, the BlueNatHxRPR is well worth considering.
Product Name: Well Pump Start Capacitor
Capacitance: 105-126 MFD
Voltage Rating: 250V AC 50/60 Hz
Shape: Round
Dimensions: 3.33 inches height x 2.0 inches diameter
Net Weight: 4.2 oz
Material: Aluminum shell
Compatible Replacements: Franklin Part #275464118
Compatible Control Boxes: 2823008110, 2823018110, 2801084915, 2823018310, 2823508110
Pros
- High-quality USA-made capacitor with consistent capacitance values.
- Exact fit for popular Franklin and CRC well pump control boxes.
- Durable copper construction withstands heat and vibration.
- Trusted by hundreds of users with overwhelmingly positive feedback.
- Competitive price for a premium replacement component.
Cons
- No returns accepted for electronic components, so verify compatibility before purchase.
- Limited to 1/2 and 3/4 HP pump motors; not suitable for larger or smaller systems.
- Capacitance tolerance (59-71 MFD) may require confirmation for precise applications.
The TuhorsePumps 59-71 MFD start capacitor is a straightforward replacement part designed for Franklin 1/2 and 3/4 HP well pump control boxes. If your pump motor hums but fails to start, a weak capacitor is often the culprit. This unit, manufactured by Barker Microfarads in the USA, restores reliable starting power and extends the life of your pump system.
Standout features include its precise 59-71 microfarad range and 220VAC rating, which match the original Franklin specifications exactly. The copper construction and 105°C temperature rating ensure it can handle the heat and electrical stress common in well pump environments. Users consistently report that it fits perfectly and solves starting issues on the first try.
Real-world performance is excellent: with a 4.6-star average from over 250 reviews, most customers note immediate improvement in motor startup. The capacitor is compact (2.15 inches wide, 3.35 inches tall) and fits into standard control boxes without any modifications. Installation is simple for anyone comfortable with basic electrical work.
One honest drawback is the no-return policy on electronic components, so double-check your control box model (Franklin 2801054915 or CRC 2824075015) before ordering. Also, the capacitance tolerance (59-71 MFD) means it may not be ideal for motors that require a very specific capacitance value outside that range.
Overall, this is a reliable, well-made replacement capacitor that delivers exactly what it promises. For homeowners and technicians maintaining Franklin-based well pumps, it is a cost-effective and trusted solution backed by strong customer satisfaction.
Capacitance: 71 microfarad (range 59-71 MFD)
Voltage: 220VAC, 50/60Hz
Dimensions: 2.15" diameter x 3.35" height
Temperature Rating: 105°C
Material: Copper
Shape: Cylinder
Compatible With: Franklin 275464105, 2801054915, CRC 2824075015
Manufacturer: Barker Microfarads (BMI)
UPC: 030955064147
Pros
- Reliable start capacitor that restores water quickly.
- Direct replacement for common well pump control box capacitors.
- Robust aluminum construction for better heat dissipation.
- Very affordable compared to replacing the entire control box.
- Positive customer feedback with many reporting perfect fit.
Cons
- Next-day delivery may not be available for all locations.
- Only provides start capacitor function; does not include run capacitor.
- Limited to 86-103 MFD range, so must verify exact requirement.
This BlueNatHxRPR start capacitor is designed as a drop-in replacement for well pump control boxes, particularly Franklin Electric 3/4 HP and 1 HP models. It is ideal for homeowners or technicians looking to fix a failed pump without replacing the entire control unit.
With a capacitance rating of 86-103 MFD and a maximum voltage of 250V AC, it delivers the precise surge needed to start single-phase well pump motors. The aluminum CBB65 housing provides excellent heat dissipation, ensuring reliable operation even in demanding conditions.
The capacitor measures approximately 2 inches in diameter and 3.3 inches tall, fitting easily into standard control boxes. Its round shape and press-fit mounting simplify installation using nylon ties or bent steel pins, as noted in the product description.
A minor drawback is that delivery may not offer next-day options, which could be inconvenient during an emergency. Also, this is only a start capacitor; if your system also needs a run capacitor, you will need to purchase that separately. Ensure your specific capacitance requirement falls within 86-103 MFD before ordering.
Overall, the BlueNatHxRPR capacitor delivers reliable performance at a fraction of the cost of a new control box. With a strong customer rating and direct compatibility with popular Franklin models, it is a smart choice for restoring water supply quickly.
Pros
- Reliable performance as confirmed by positive customer reviews
- Affordable price compared to OEM capacitors
- Durable copper material withstands power surges
- Compact design fits standard control boxes
- Quick shipping and responsive customer support
Cons
- Some units may have internal movement causing a rattle when shaken
- Not an original Franklin part, which may concern brand-loyal users
- Smaller physical size than some original capacitors, though ratings match
The Poweka 105-126 uf motor start capacitor is designed as a replacement for Franklin well pump control boxes, compatible with 1HP, 1.5HP, and 2HP models. It is ideal for homeowners or technicians needing a cost-effective alternative to OEM parts.
With a capacitance range of 105-126 uF and voltage rating of 220-250VAC, this capacitor matches the specifications required by many Franklin control boxes. Customer reviews highlight its reliable performance and quick delivery, with many users reporting successful replacements.
The capacitor features a copper construction and a compact round shape that fits easily into standard control boxes. It is rated for temperatures from -40 to +65 degrees Celsius, ensuring durability in various environments.
Some users note that the capacitor is slightly smaller than the original, and a few have reported a slight internal rattle. As a non-OEM part, it may not carry the same brand assurance, but it is fully functional and backed by customer support.
Overall, the Poweka capacitor pack offers excellent value for money, providing two units for a reasonable price. For those seeking a dependable replacement for Franklin well pump control boxes, this is a solid choice.
- Capacitance: 105-126 uF (MFD)
- Voltage: 220-250VAC
- Frequency: 50/60 Hz
- Temperature Range: -40 to +65 degrees Celsius
- Material: Copper
- Shape: Round
- Dimensions: 3.35 inches height x 1.44 inches diameter
- Pack Size: 2 capacitors
- Compatible with Franklin part numbers 2823008110, 2823018110, 2801084915, 2823018310, 2823508110
Buying Guide: How to Choose the Right Shallow Well Pump Capacitor
Capacitance and Voltage Rating
The capacitance value (measured in microfarads, MFD or uF) must match your control box specifications. Using an incorrect value can cause motor overheating or failure to start. All four products reviewed here operate at 220-250V AC, 50/60 Hz, but their capacitance ranges differ. The 59-71 MFD capacitor from TuhorsePumps suits 1/2 and 3/4 HP pumps, while the 86-103 MFD and 105-126 MFD options fit larger motors. Always check your control box model number to confirm the required range.
Compatibility with Franklin Control Boxes
Franklin Electric control boxes are the most common in residential shallow well systems. Each capacitor in this review explicitly lists compatible Franklin part numbers. For example, the 105-126 MFD capacitor by BlueNatHxRPR replaces Franklin #275464118 and fits models 2823008110, 2823018110, and others. The Poweka capacitor (also 105-126 MFD) comes in a two-pack and is compatible with similar Franklin boxes. Verify your control box model before ordering to ensure a perfect fit.
Build Quality and Durability
Start capacitors are consumable parts that degrade over time. A robust housing and quality internal materials extend service life. The BlueNatHxRPR capacitors feature a classic round design with a strong shell, while the TuhorsePumps capacitor is made in the USA by Barker Microfarads (BMI), known for reliability. The Poweka two-pack offers a slightly smaller diameter but still delivers 100% functionality. For quieter pump operation, consider pairing your new capacitor with a quiet well pump.
Single vs. Multi-Pack Options
Most capacitors are sold individually, but the Poweka pack of two gives you a spare for future replacements. If you have multiple pumps or want backup, the two-pack is a smart choice. Single capacitors are fine for a one-time fix and often cost less upfront. Evaluate your long-term needs and whether you prefer to stock a spare.
Final Thoughts
Choosing the right shallow well pump capacitor comes down to matching your control box specs and preferred brand. For most homeowners with a 1.0 to 2.0 HP Franklin system, the 105-126 MFD (uF) Motor Start Capacitor Compatible from BlueNatHxRPR offers a proven fit and solid build. If you have a smaller 1/2 or 3/4 HP pump, the 59-71 MFD (uF) 220VAC 1/2 and 3/4 HP Well Pump from TuhorsePumps delivers American-made quality that lasts. Both options are highly rated and will get your water flowing again without breaking the bank.
Frequently Asked Questions
How do I know if my well pump capacitor is bad?
A failing capacitor often causes the pump motor to hum but not start, or it may trip the breaker after a few seconds. You can measure capacitance with a multimeter; if the reading is below the rated range, replacement is needed. In 2026, many homeowners also notice intermittent water pressure drops as the capacitor weakens.
Can I replace a well pump capacitor myself?
Yes, if you have basic electrical knowledge and safety precautions. Always disconnect power to the control box before opening it. The capacitor typically has two spade terminals and can be swapped in minutes. If you are unsure, consult a professional or read our well pump kit buying guide for additional context.
What size capacitor do I need for my Franklin control box?
Check the model number on your control box label. Common Franklin boxes for shallow wells use 59-71 MFD (1/2-3/4 HP), 86-103 MFD (3/4-1 HP), or 105-126 MFD (1-2 HP). All capacitors in this review list compatible part numbers, so match your box to the list.
Do I need a start capacitor or a run capacitor?
Shallow well pumps typically use a start capacitor to give the motor an initial torque boost. Run capacitors are used in some larger pumps but are less common in residential systems. The products reviewed here are all motor start capacitors. If your pump has a separate run capacitor, it will look different and have a different rating. For more on pump types, visit our Replacement & Parts category.
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