Use the correct fuel

The National Kerosene Heater Association, the American Petroleum Institute, the Consumer Product Safety Commission and others recommend only 1-K kerosene be used in these heaters. According to American Society of Testing and Materials Standard D-3699, "Standard specifications for kerosene," there are two types of kerosene fuels, 1-K and 2-K. The primary difference is sulfur content. Type 1-K contains 0.04 percent sulfur by weight and 2-K contains 0.30 percent sulfur by weight. The higher sulfur content of 2-K fuel tends to adversely affect proper fuel wicking and increases sulfur dioxide emissions. The use of 2-K kerosene creates the need for frequent wick cleaning and maintenance that, if not carried out properly, may produce a fire or explosion hazard.

The distinction between 1-K and 2-K kerosene fuels cannot be made through visual examination. The terms "water clear" or "clear white" are often used to describe the type of kerosene that can be used in the unvented heater. Although water clear or clear white kerosene may be 1-K in most cases, color should not be used as a sole indicator. The type of crude from which the kerosene is refined, temperature, aging and contamination can all cause kerosene to yellow and become darker. So if the retail dealer does not specifically market the kerosene as the 1-K type of fuel, you should assume the product is not 1-K kerosene. Find a dealer who can certify you are buying 1-K grade kerosene.

In addition, never use diesel, jet "A" fuel, No. 1 fuel oil, No. 2 fuel oil or gasoline in your heater. The use of any of these fuels could result in a fire or explosion that could cause death or injury.