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Furnace Flame Rods

Furnace Flame Rods

Shop furnace and burner flame rods for commercial and industrial combustion systems, as well as residential furnace applications. Furnace Part Source carries flame rods from Maxon, Fireye, AERCO, Modine, Auburn, and other leading brands by length, diameter, and part number.

Use the product list below to find the correct flame rod by part number, length, or equipment model. Always confirm the rod length, mounting style, and voltage compatibility before ordering to help avoid fitment issues.

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Furnace Flame Rods

A flame rod, also called a flame sensing electrode, confirms that a burner flame is present through a process called flame rectification. When the rod detects a stable flame, it completes an electrical signal that allows the burner to continue running; if the flame is lost, the system shuts off fuel flow as a safety measure.

Furnace Part Source carries a range of flame rods for commercial and industrial burners, boilers, and unit heaters, along with flame rods used in select residential furnace applications.

Common Flame Rod Parts We Carry

Common flame rod components include:

  • Standard flame rods in a range of lengths for various burner and boiler applications.
  • Flame rod assemblies that include the rod along with mounting hardware or connectors.
  • Remote flame rods used with pilot and burner assemblies on select commercial equipment.
  • Ignition/flame rod cables used to connect the rod to the control system.

How to Find the Right Flame Rod

Before ordering, check the equipment data plate and the existing flame rod for the model number and part number. Confirm the rod length and diameter, since a rod that is too short may not properly detect the flame, while one that is too long can be prone to mechanical damage.

For best fit, compare:

  • Original flame rod part number
  • Rod length and diameter
  • Mounting style and connection type
  • System voltage requirements
  • Equipment model, such as burner, boiler, or unit heater

Material compatibility also matters. The flame rod material should be suited to the fuel type and combustion environment, particularly for high-temperature commercial and industrial applications.

Flame Rods From Leading HVAC & Combustion Brands

Our catalog includes flame rods from Maxon, Fireye, AERCO, Modine, Auburn, Armstrong Furnace, Crown Engineering, Lochinvar & A.O. Smith, and Honeywell, covering a range of residential, commercial, and industrial combustion equipment.

Need Help Matching a Flame Rod?

Not sure which flame rod you need? Use the model number, serial number, and part number from your equipment to narrow the search, or contact Furnace Part Source for help identifying the correct replacement.

Flame Rod FAQs

What is the difference between a flame rod and a flame sensor?

Flame rod and flame sensor are often used interchangeably. Both detect the presence of a flame through ionization or rectification to confirm safe, continuous combustion.

What happens if a flame rod fails?

If a flame rod fails or gives an inaccurate signal, the system may shut down the burner as a safety precaution, or in some cases fail to detect a flame that is present, causing short cycling or lockouts.

How do I measure a flame rod for replacement?

Measure the length and diameter of the existing rod, and note the mounting style and connection type. These details are typically included in the product name for cross-reference.

Are flame rods used on residential and commercial equipment?

Yes. Flame rods are used across a range of equipment sizes, from small residential furnace and boiler applications to large industrial burners, though rod length, material, and mounting style can vary significantly by application.