Sub-ohm tanks work the same way as regular vape tanks. However, sub-ohm tanks are geared towards high-powered setups.
A sub-ohm tank’s coil head attaches to the tank’s base, and the cotton wick absorbs the e-liquid, which becomes vapor when it comes in contact with the heated-up coil.
When taking a hit, the e-liquid is pulled by the suction towards the coil. The latest sub-ohm tanks almost always feature a top-fill system, and sports open airflow holes for that DTL draw while also keeping the coil from getting overly hot.
With sub-ohm tanks, increasing the amount of vapor the coil produces is as easy as increasing the unit’s battery power; more power means results in a hotter coil, and a hotter coil produces more vapor. Keep in mind that an excessively hot coil can burn your wick and cause the vapor to become uncomfortable and taste burnt.