The best oil burner motor depends on the burner’s required voltage, horsepower, speed, rotation, shaft, and mounting style. For a 3450-RPM replacement, the LEUNGOO 21805U-style motor lists several replacement references and key shaft details; the Genuine OEM 21805U is the direct part-number option. The Carlin 98022S is suited to residential burners, while Marathon offers different speed and horsepower configurations. Confirm the burner’s nameplate and service documentation before choosing: a burner motor is not necessarily the same component as a separate combustion-air blower.
| Product | Best suited for | Listed specifications or identifiers |
|---|---|---|
| LEUNGOO 21805U replacement | Matching several listed replacement part numbers | 1/7 HP, 3450 RPM, 115 V, CCW shaft-end rotation |
| Genuine OEM 21805U | Buyers seeking the named OEM part | 120 VAC, 60 Hz, 1/7 HP |
| Carlin 98022S | Residential burner applications that call for this model | 1/7 HP, 120 V |
| Marathon O600 | Applications requiring a slower, 1725-RPM motor | 1/8 HP, 115 VAC, 48N frame |
| Marathon O004 | Applications calling for 1/4 HP and 3450 RPM | 1/4 HP, 3450 RPM, 115 V |
LEUNGOO 21805U Replacement Burner Motor
This LEUNGOO motor is best for buyers whose existing burner motor matches one of the replacement references in its listing, including Beckett 2456 or 2456U and Carlin 98022S. The product information gives several useful electrical and mechanical details for checking a match.
- Listed as 1/7 HP, 3450 RPM, 115 V, and 1.6 A.
- Includes a stated 10 MFD/370 VAC capacitor.
- Lists counterclockwise rotation viewed from the shaft end and a 1/2-inch shaft diameter.
- Also names SA55GYKPA-5733, A.O. Smith OBK6002, Marathon 0701, and Emerson 3248 as replacement references.
Who it is best for: Choose this option when the current motor’s part number and specifications align with the listing. The multiple cross-references make it a practical candidate when replacing one of the named models.
Limitation: The listed voltage is 115 V, and the references do not establish universal fit. Verify rotation, shaft dimensions, capacitor requirements, and mounting before ordering. Do not rely on horsepower or a cross-reference alone.
Genuine OEM 21805U Oil Burner Motor
This motor is best for a buyer specifically looking for the Genuine OEM part number 21805U. Its brief listing identifies it as a 120 VAC, 60 Hz, 1/7 HP motor. Those details offer a starting point for comparison with the existing motor’s label.
Why it was selected: The 21805U part number is also cited as a replacement reference in the LEUNGOO listing, making this product relevant to buyers comparing a named OEM part with a cross-reference replacement. The product information explicitly identifies it as a genuine OEM part.
Who it is best for: Consider it when the burner’s service information or removed motor specifies 21805U and the electrical requirements match. It may be a clearer choice than a broad cross-reference when retaining the exact stated part number is the priority.
Limitation: The supplied product details do not state RPM, rotation, shaft diameter, mounting dimensions, or capacitor requirements. Confirm these items with the burner documentation or supplier before treating it as a fit.
Carlin 98022S Universal Oil Burner Motor
The Carlin 98022S is best for residential burner applications that call for model 98022. Its listing identifies the motor as 1/7 HP and 120 V and describes it as a universal oil burner motor for residential burners.
Why it was selected: The model number is a useful identification point for buyers replacing a Carlin motor. It is also named among the replacement references in the LEUNGOO listing, providing a relevant comparison for shoppers evaluating a model-specific product against a cross-reference option.
Who it is best for: Choose this motor when the burner’s parts information specifies Carlin 98022 or 98022S and the required electrical and physical characteristics match. It is more directly relevant than a motor selected only because its horsepower seems similar.
Limitation: The supplied details do not provide RPM, rotation, shaft dimensions, or mounting specifications. “Universal” in the product name should not be taken to mean it fits every burner. Check the original motor and burner requirements before purchase.
Marathon O600 1725-RPM Oil Burner Motor
This Marathon motor is best for a burner application that specifically calls for a 1725-RPM, 1/8-horsepower motor. The listing describes a single split-phase, one-speed motor with a 48N frame and open drip-proof enclosure.
- Rated at 1/8 HP and a maximum speed of 1725 RPM.
- 115 VAC, single split phase, and one-speed operation.
- 48N frame, flange mounting, open drip-proof enclosure, and sleeve bearing system.
Why it was selected: It provides a distinct speed and mounting configuration for comparison with the 3450-RPM motors in this guide. The frame, flange mounting, and bearing type are important details for buyers matching a specific installation.
Limitation: This is not a like-for-like choice for a burner requiring 3450 RPM or a different horsepower, frame, or mounting arrangement. The supplied information does not provide shaft dimensions or rotation, so verify those before ordering.
Marathon O004 3450-RPM Burner Motor
The Marathon O004 is best for a replacement application that calls for a 1/4-horsepower, 3450-RPM oil burner motor. The listing gives those specifications along with a 115 V rating and 4.2 A current.
Why it was selected: Its higher listed horsepower differentiates it from the 1/7-HP options. That makes it useful to consider only when the original motor or equipment documentation specifies a comparable rating and speed.
Who it is best for: Choose this model if the burner’s required motor specifications include 1/4 HP and 3450 RPM, and its electrical and installation requirements also align.
Limitation: It should not be substituted for a 1/7-HP motor simply because both operate at 3450 RPM. The available listing details do not specify shaft size, rotation, capacitor, frame, or mounting style; confirm those requirements before purchase.
Buying Guide: How to Choose an Oil Burner Motor
Is the part a burner motor or a separate blower?
“Oil burner blower motor” can refer to different components. The products above are listed as oil burner motors, while a burner may also use a separate fan or blower assembly to move combustion air. A replacement motor does not automatically replace a blower wheel, fan, or complete blower unit. Identify the part from the burner diagram and the existing equipment before shopping.
Do not assume that any product described as a blower is suitable as a burner motor. Small centrifugal blowers, 12 V fans, and waste-oil heater assemblies serve different purposes and may have different power, airflow, temperature, and installation requirements. Match the component type as well as the model.
Which specifications should match?
Start with the original motor’s nameplate and the burner manufacturer’s service documentation. Compare the voltage, frequency, horsepower, RPM, current, rotation, shaft diameter and length, mounting pattern, and capacitor requirements. A motor can have the correct voltage but still be unsuitable if its speed, rotation, shaft, or mounting differs.
Part numbers and documented replacement references are useful, but they do not replace a specification check. For example, the LEUNGOO listing states 115 V and 3450 RPM, while the Genuine OEM listing states 120 VAC and 60 Hz but does not provide RPM. Check the exact motor and burner requirements rather than treating the two listings as identical in every detail.
Does RPM matter when choosing a replacement?
Yes. RPM is a key specification and should match the equipment requirements. The Marathon O600 is listed at 1725 RPM, while the LEUNGOO and Marathon O004 listings specify 3450 RPM. These are not interchangeable choices based on the product category alone. Confirm the required operating speed in the burner documentation or from a qualified service professional.
How should horsepower and electrical ratings be compared?
Match horsepower and electrical ratings to the motor being replaced and the burner’s documented requirements. The products here include 1/8-HP, 1/7-HP, and 1/4-HP models. A higher horsepower rating is not automatically an upgrade; an incorrect motor can fail to meet the burner design requirements. Also compare voltage, frequency, and current when those values are provided.
When is an OEM part number useful?
An exact part number can narrow the search when it appears on the existing motor or in the burner’s parts list. The Genuine OEM listing names 21805U, and the Carlin listing names 98022S. Cross-reference numbers can be helpful, but verify that the replacement’s physical and electrical details match the actual installation. If the label is missing or unclear, consult the burner manufacturer or a qualified technician.
What should buyers check before installation?
Confirm that the motor is intended for the specific burner and that the replacement matches the required wiring, mounting, shaft, rotation, and capacitor specifications. Oil burner servicing involves fuel and electrical equipment. Follow the manufacturer’s service instructions and applicable safety procedures; use a qualified technician when you are not trained to perform the work safely.
Frequently Asked Questions
Can I replace an oil burner motor with any motor of the same horsepower?
No. Horsepower alone is not enough. Voltage, frequency, RPM, rotation, shaft dimensions, mounting, and other required specifications also need to match.
Are 1725-RPM and 3450-RPM burner motors interchangeable?
Not by default. They operate at different listed speeds. Use the speed specified for the burner and confirm the replacement against the original motor and equipment documentation.
Is an oil burner motor the same as an oil burner blower?
Not necessarily. A motor may drive a blower, but the motor and blower assembly are distinct parts. Check whether the repair calls for a motor, blower, fan, or complete assembly.
What does a motor cross-reference number tell me?
A cross-reference indicates that a listing names another model or part number as a replacement. It is a useful comparison point, but buyers should still verify electrical, mechanical, and installation requirements.
What should I do if I cannot read the motor label?
Use the burner model and serial information to consult its service documentation or contact the manufacturer or a qualified service professional. Do not guess based only on appearance or horsepower.