Bottom Coil – What is it in Vaping?

Definition

A Bottom Coil is a heating element positioned at the base of a vapetank or clearomiser, directly above the Battery or Mod“>Box Mod connection. By sitting low, it stays saturated with e-liquid through gravity-fed wicking, delivering consistent flavour and reducing the risk of dry hits. Designed for simplicity, bottom coil atomisers are popular among Australian vapers who want reliable performance without rebuilding.

Technical Details

Inside a bottom coil head, a resistancewire—commonly Kanthal, stainless steel, or nickel—forms either a horizontal coil wrapped around Cotton“>organic cotton or a Vertical Coil)”>BVC (Bottom Vertical Coil) standing upright for enlarged airflow and faster wicking. Typical resistances range from 0.3 Ω to 1.8 Ω, accommodating both mouth-to-lung and direct-lung styles. Coil housings are press-fit 510-threaded or plug-and-play “drop-in” cartridges, with silicone gaskets sealing Juice Flow”>juice flow. Variants include single, dual, and mesh bottom coils, each influencing ramp-up time, vapour density, and battery drain.

Usage & Tips

• Priming:Drip 2-3 drops of e-liquid onto exposed cotton before first use to avoid burnt taste.
• Power range: Stay within the coil’s recommended wattage printed on the casing to prevent overheating.
• Leaking: Ensure all o-rings are seated and tighten the tank firmly to the Box Mod; avoid over-tightening which can deform seals.
• Cleaning: Rinse coil heads under warm water weekly, let dry 24 h, or replace every 5-10 mL for best flavour.
• Safety: Check resistance on your mod’s screen before firing; never use in Bypass Mode unless the coil resistance is above 0.15 Ω.

History & Context

Bottom coils emerged around 2012 as an evolution from top-coil clearomisers, solving wicking issues and muted flavour. Brands like Kanger and Aspire popularised the design, leading to today’s mesh and vertical coil innovations that dominate the Australian vape market.