Kanthal wire: winding wire for self-made coils explained

Kanthal is actually a brand name of the Swedish manufacturer Kanthal AB and refers to a group of iron-chromium-aluminium alloys (FeCrAl). In the vaping context, ‘Kanthal’ usually refers to the Kanthal A1 heating wire, which consists of around 70% iron, 20–22% chromium and 5–6% aluminium. This composition forms a stable layer of aluminium oxide on the surface, which protects the wire from corrosion and makes it heat-resistant.

Unlike nickel (Ni200) or stainless steel wires (SS316L), Kanthal is not suitable for temperature control (TC) mode. It is used exclusively in power or wattage mode because its electrical resistance remains virtually constant regardless of temperature. This is precisely what makes it so predictable: once the wattage is set, it produces a stable, consistent vapour output without unexpected fluctuations.

A Kanthal coil is a coiled spiral of Kanthal heating wire wrapped around a piece of cotton wool. When current flows through the wire, it heats up and vaporises the liquid in the cotton wool. The electrical resistance of the coil determines how much power is converted at what voltage.

Typical applications

• MTL (Mouth-to-Lung) rebuildables: Thin Kanthal coil wire in 0.4–0.5 mm produces resistances of around 1.0–1.4 ohms and is suitable for restrictive RTAs at 10–18 watts.
• DL setups (Direct-Lung): Thicker wires in 0.5–0.6 mm or braided variants (Clapton) yield resistances of 0.4–0.8 ohms and typically run between 25 and 60 watts.
• Pre-made coils: Many pre-made replacement coils in sub-ohm atomisers also use Kanthal A1 as the heating element.

• Choose a diameter to suit your style: 0.25 mm for very fine MTL builds, 0.4 mm as an all-rounder, 0.5–0.6 mm for high-vapour DL setups. The thicker the wire, the more wraps you’ll need for the same resistance and the longer it takes to heat up.
• Calculate the resistance beforehand: Use a coil calculator (Steam Engine or similar) and check whether the calculated resistance is suitable for your mod. Anything below 0.15 ohms should only be used by experienced vapers with tested mods.
• Operate in wattage mode only: Never use Kanthal A1 in TC mode, otherwise the control system will malfunction.
• Burn-in properly: After winding, burn-in the coil at low power (15–25 W in pulses) until it glows orange evenly from the inside out. This removes hotspots.
• Quality matters: Look for clean, oxide-free coils and clear diameter specifications. Cheap, no-name coils vary in cross-section and distort the resistance.

Common mistakes: wound too tightly (hotspots), wicks too long on the deck (resistance increases), cotton packed too tightly (dry hits). A quick test run without e-liquid will show you whether the coil glows evenly.

Is Kanthal wire suitable for beginners?

Yes. Kanthal A1 is forgiving of minor winding errors, is affordable, readily available and easy to bend. It is the most practical choice for those starting out with DIY coil building.

What is the difference between Kanthal A1 and Nichrome?

Nichrome (NiCr) heats up faster and has a slightly lower resistance, but is less dimensionally stable. Kanthal A1 retains its coil shape better and is more robust in everyday use, but takes a second longer to heat up.

Can I use Kanthal with temperature control?

No. Kanthal’s temperature coefficient is too low – TC modes cannot regulate the temperature effectively. For TC, use only Ni200, Ti or SS316L.

How long does a Kanthal coil last?

Depending on the e-liquid and wattage, around one to three weeks. Sweet, heavily sweetened flavours significantly shorten the lifespan because sugar residues carbonise on the wire.

Kanthal wire remains the tried-and-tested choice for building your own coils: easy to work with, predictable in resistance and available in every standard gauge. If you build your own coils, there’s hardly any getting around it. If you want to explore the topic further, you’ll find suitable wires and pre-built coils in our selection of coils and winding accessories, as well as complementary atomiser accessories for your setup. Take your time comparing diameters and lengths and find your way to your favourite setup.