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Kerosene heater wick: keep it clean, replace it right

By the Plain Prepper editors. Updated 2026-10-15.

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Quick answer

The wick is the part a kerosene heater burns from, and Sengoku's manual links wick trouble to carbon buildup and poor fuel. Buy the wick by the part number your heater's maker lists. For example, Sengoku's OS-65B fits the HeatMate HMN-110 and KeroHeat CTN-110, and OS-0023 fits the HMC-23K and CV-23K. Sengoku's manual says to clean a fiberglass wick with an outdoor dry burn every 5 or 6 tankfuls. Its maximum wick height is 1/2 inch. Use only water-clear 1-K kerosene, as CPSC also advises.

Match the wick to your heater

Wicks are model-specific. Sengoku lists its genuine wicks by part number and the heaters each fits:

Sengoku part	Fits
OS-65B	KeroHeat CTN-110, HeatMate HMN-110, RedStone RS-110
OS-0023	KeroHeat CV-23K and CV-23K(H), HeatMate HMC 23K, RedStone RS-235

Find the wick number in your heater's specifications; Sengoku's CTN-110 manual lists "Wick No. OS-65B". Many wicks sold online say they are "compatible" with several brands. If you buy one, compare its size and design with the original before fitting it, and keep the old wick until the new one is confirmed to work.

Why wicks clog: carbon and fuel

Sengoku's manual is blunt about fuel. With improper, deteriorated or impure kerosene, the wick can be covered in excess carbon within 3 to 20 hours. The results:

• The burner does not glow fully red and gives off a strong odor.
• The wick becomes hard to light, or the flame dies soon after.
• The wick stiffens so the flame may not go out when you press the shut-off.

Use only clear or red-dyed No. 1-K kerosene; CPSC says water-clear 1-K, never gasoline, and to buy from a dealer who can certify the grade. Turning the flame too low with the adjuster also builds carbon and odor, and CPSC warns not to run below the minimum wick-stop setting.

Check it: feel, height and warning signs

• Feel the top: Sengoku says a good fiberglass wick feels soft; a carbonized one feels like a bristle brush or, later, has a hard black crust. Check after the second or third tankful.
• Height: the CTN-110 lists a maximum wick height of 1/2 inch (13 mm), even all the way around.
• Warning signs: resistance when moving the wick adjuster, a burner that is not fully red, or hard lighting all point to carbon on the wick.
• New wick or first fill: wait 60 minutes after filling so the wick soaks up kerosene before lighting; Sengoku says lighting a dry wick can damage it permanently.

Clean it: the dry burn

Sengoku calls this carbon removal or dry burn. Do it outdoors or on a porch because of the strong odor:

1. Leave only a little kerosene in the tank and let the heater burn until it runs dry.
2. As the flame fades, raise the wick fully and let it burn out.
3. Wait about 60 minutes, relight it and let it burn out again.
4. When cool, brush away ash with an old toothbrush. If parts stay stiff, Sengoku says to crack the carbon with small pliers and repeat.
5. Refill and wait 60 minutes before lighting.

On timing, the manual gives two schedules: within 5 to 7 days of first use and then every 5 or 6 tankfuls, and elsewhere weekly during the heating season. If you run the heater daily, the weekly schedule is the safer reading. Never leave it burning unattended.

Replace it: when and how

Replace the wick if a dry burn does not restore it, if it is damaged, or if Sengoku's troubleshooting chart points to it. The manual's rules:

• Work only on a completely cooled heater, after removing the fuel tank and burning off the remaining kerosene.
• Follow your model's step-by-step instructions; the CTN-110 takes about 15 steps, including removing the chimney, batteries, body, igniter and wick holder.
• Take care with the wind cover; Sengoku warns its edge is very sharp.
• After reassembly, fill with water-clear 1-K kerosene and wait 60 minutes before lighting.

If water gets into the tank, or at the end of the season, Sengoku says to drain all kerosene from the tank.

What to look for when you buy

Questions people ask

How do I know if my kerosene heater wick needs replacing?

If a dry burn does not soften it, it is damaged, or the heater still smells, will not light or will not shut off, Sengoku's troubleshooting points to replacing the wick.

How often should I clean a kerosene heater wick?

Sengoku's manual says within 5 to 7 days of first use, then every 5 or 6 tankfuls, and elsewhere weekly in heating season; daily users should follow weekly.

How high should a kerosene heater wick be?

Follow your manual; Sengoku's CTN-110 lists a maximum of 1/2 inch (13 mm), even all the way around.

Why does my kerosene heater smell?

Sengoku links strong odor to carbon on the wick from poor fuel or a flame turned too low; use water-clear 1-K kerosene and do a dry burn outdoors.

Sources

• KeroHeat CTN-110 instruction manual, Sengoku L.A., Ltd.
• Wick (OS-65B), Sengoku L.A., Ltd.
• Wick (OS-0023), Sengoku L.A., Ltd.
• What you should know about kerosene heaters (Pub. 5052), U.S. Consumer Product Safety Commission
• Carbon monoxide questions and answers, U.S. Consumer Product Safety Commission

Sources checked 2026-10-15.