Replace the wick by unscrewing the burner assembly, sliding out the old wick, and inserting a new one of the same size

A kerosene heater wick lasts roughly one to two heating seasons before it becomes too clogged or frayed to burn cleanly. When the flame turns orange or yellow instead of blue, or when soot builds up on the glass, the wick needs replacing. The job takes about 15 minutes and requires no tools beyond a screwdriver. You will need a replacement wick that matches your heater's model number — check the manual or the manufacturer's website to find the right part.

Turn off the heater and let it cool completely. This takes at least two hours. Do not attempt to remove the wick while the heater is warm or hot, as the metal parts will burn you and kerosene fumes are stronger near a warm unit.

Key Takeaways

  • A wick typically lasts one to two seasons and needs replacing when the flame turns orange or yellow instead of blue.
  • Always let the heater cool for at least two hours before removing the wick, and work in a well-ventilated space.
  • The wick slides into a tube inside the burner assembly, which unscrews from the heater body with a Phillips or flathead screwdriver.
  • New wicks must match your heater's model number exactly, as sizes vary between manufacturers and models.
  • Soak a new wick in kerosene for at least 30 minutes before installing it so it burns evenly from the start.

Locate and unscrew the burner assembly

Open the heater's access panel or door. On most models, this swings out or lifts away. You will see the burner assembly — a metal cylinder with a wick tube running through the center. Around the base of this cylinder, you will find three or four screws holding it to the heater body.

Use a Phillips or flathead screwdriver (check your manual to see which your model uses) to unscrew these bolts. Keep them in a small cup or container so you do not lose them. Lift the burner assembly straight up and out of the heater. Set it on a clean, flat surface.

Remove the old wick

Look inside the burner assembly. The wick is a flat, woven cord that sits inside a metal tube running vertically through the center. At the bottom of the tube, you will see the wick either glued or friction-fitted in place. Gently pull the wick straight up and out of the tube. It may resist slightly — pull steadily rather than yanking.

If the wick is stuck, soak the base of the tube with a small amount of kerosene and wait five minutes, then try again. Do not force it, as you can damage the tube. Once the old wick is out, wipe the inside of the tube with a clean, dry cloth to remove any debris or residue.

Prepare and insert the new wick

Before installing the new wick, soak it in kerosene for at least 30 minutes. Pour kerosene into a shallow container and submerge the wick completely. This step is essential — a dry wick will burn unevenly and produce soot. While the wick soaks, you can clean the burner assembly. Wipe the exterior with a damp cloth and let it dry.

After soaking, remove the wick from the kerosene and let excess liquid drip back into the container. Slide the wick into the tube, pushing it down until it sits at the bottom. The wick should fit snugly but not require force. If it is too tight, you may have the wrong size — check the model number on the box and compare it to your heater's manual.

Reinstall the burner assembly

Lower the burner assembly back into the heater body, aligning the screw holes. Insert the three or four screws and tighten them firmly with your screwdriver. Do not overtighten — you want them snug enough that the assembly does not wiggle, but not so tight that you strip the threads. Close the access panel or door.

Fill the heater's fuel tank with kerosene if it is low, then turn the heater on. The new wick will take a few minutes to fully absorb fuel and light. You may see a slightly orange flame for the first 10 to 15 minutes as the wick burns off any air pockets. Once the flame settles into a steady blue color, the replacement is complete.

Common mistakes that damage the wick or heater

The most frequent error is installing a wick without soaking it first. A dry wick produces thick black soot that coats the glass and the burner, and it burns much hotter than it should, shortening its life. Soaking takes only 30 minutes and prevents this entirely.

A second mistake is forcing a wick that does not fit. If the wick is too large for the tube, it will not slide in smoothly. Forcing it can bend the tube or tear the wick. If you encounter resistance, stop and verify that you have the correct model number. Wick sizes vary significantly between brands and even between models from the same brand.

Finally, do not reinstall the burner assembly while the heater is still warm. The metal parts expand when hot, and you may not seat the assembly correctly. Wait until the heater has cooled completely, or you risk fuel leaks or uneven burning.

When to replace the wick versus cleaning it

A wick that is slightly discolored or has minor soot buildup can sometimes be cleaned and reused. Turn off and cool the heater, then remove the wick and soak it in kerosene for several hours. Gently brush away loose soot with a soft brush, then soak it again. If the flame returns to blue after reinstalling, the wick is still good.

However, if the wick is frayed, torn, or has hard, crusty buildup that does not come off with soaking, replacement is the only option. A damaged wick will not burn evenly no matter how much you clean it, and it will continue to produce soot. A new wick costs between $10 and $25 depending on the model, and it lasts much longer than a cleaned one.

Frequently Asked Questions

Can I use a wick from a different brand heater?

No. Wicks are sized specifically for each heater model, and using the wrong size will cause uneven burning and soot. Always match the model number on your heater to the wick box. If you cannot find the model number, contact the manufacturer with a photo of your heater.

What if the new wick does not light or burns orange?

First, check that you soaked the wick for at least 30 minutes before installing it. If you did, turn off the heater and let it cool, then remove the wick and soak it again for another 30 minutes. Reinstall it and try again. If it still burns orange, the wick may be the wrong size — verify the model number and order the correct one.

How often should I replace the wick?

Most wicks last one to two full heating seasons if you use the heater regularly. If you use it only occasionally, a wick may last longer. Replace it whenever the flame turns orange or yellow, or when you see heavy soot buildup on the glass, rather than waiting for a set time.

Do I need to drain the fuel tank before replacing the wick?

No. The fuel tank and burner assembly are separate, and removing the burner does not affect the tank. However, work in a well-ventilated space because kerosene fumes are present whenever the heater is open. If fuel has spilled inside the heater body, wipe it up with a cloth before reassembling.

Can I clean the wick instead of replacing it to save money?

Cleaning works for minor discoloration, but only once or twice. After that, the wick fibers break down and cleaning no longer restores even burning. A replacement wick is inexpensive and will perform much better than a repeatedly cleaned one.