Posted: June 1, 2026

K1 vs K2 Kerosene: What’s the Difference?

There’s Only One Option for Home Use

Outside of areas and climates like ours, where deep and prolonged cold can cause regular heating oil to gel in outside tanks, kerosene is mainly used in industrial applications and as jet fuel. But for homes and businesses across Vermont, kerosene is a smart choice to heat spaces that rely on outdoor storage tanks. It can also be a smart fuel to have on hand for backup heating.

There are two types of kerosene commonly available, but only K-1 is safe for indoor or residential use. Roberts will only deliver K-1 to homes, but it’s important to know the difference and why you shouldn’t use K-2 kerosene indoors.

K-1 Kerosene

K-1 kerosene is highly refined and contains far less sulfur than K-2 kerosene. As a result, it burns much cleaner, producing very little odor and soot. That means air quality in indoor spaces is not impacted, and equipment burns the fuel more efficiently.

When the power goes out, kerosene can be used in lanterns, and a portable kerosene heater makes an excellent backup heating source. It will quickly warm specific rooms or even an entire small home. And, since carbon monoxide emissions produced by kerosene heaters are considered very low, it’s safer than some other options. It’s also ideal for garage and workshop heaters.

If you’re unsure what type of kerosene you have, K-1 tends to be “water clear” while other types are yellow or sometimes dyed red.

K-1 kerosene is also used in a 50/50 blend with regular heating oil to help prevent gelling during extreme cold.

Kerosene is often used as a heating fuel in industrial spaces. Warehouses, workshops, construction sites, and farms rely on kerosene heating systems for powerful, consistent heat output. It heats large spaces quickly, is an alternative fuel in areas without natural gas access, and provides precise temperature control.

K-2 Kerosene

Because K-2 kerosene is less refined, it costs less to produce. However, K-2 can have as much as 10 times more sulfur. It creates more smoke, soot, and odor when it burns and the fumes can be dangerous to breathe, particularly in enclosed spaces.

K-2 kerosene is most commonly used in winter in outdoor construction, industrial equipment and some agricultural settings, because diesel starts to wax up at just 32 degrees. Kerosene effectively powers a wide range of machinery including:

• Construction equipment heaters
• Agricultural irrigation pumps
• Outdoor lighting systems
• Portable generators in commercial settings

Specialized equipment such as tar kettles, asphalt heaters, and industrial cleaning systems can also use kerosene, which has consistent burn characteristics and clean combustion that makes it ideal for applications requiring precise temperature control and minimal residue formation.

Ready for Delivery?

With offices in Brattleboro, Bridport, Fairfax, Grand Isle and other Vermont communities, Roberts is standing by for 24/7 deliveries and service. Whether you need kerosene or a fifty-fifty blend of kerosene and heating oil, we’re ready to help, with reliable delivery, transparent pricing, equipment service and more to keep your family comfortable year-round.

Contact us today.