# Coil resistance: picking the right ohm for your draw > 1.2, 0.8 or 0.4 ohm? How coil resistance sets your draw style, vapour volume and flavour, and how to match it to airflow, wattage and e-liquid. A number stamped on a small metal cylinder decides most of what your device will do. Coil resistance, expressed in ohms, governs how hard the draw feels, how much vapour arrives and how warm it is when it gets there. Pick it at random and the setup will feel wrong in ways that no amount of fiddling with wattage will fix. Read it properly and almost everything else falls into place. ## What coil resistance actually controls The figure printed on a coil is the electrical resistance of the heating element inside it. A regulated device reads that value and applies power accordingly, which is why the same wattage behaves so differently across two coils. A high value heats slowly and gently. Less current passes, the wire reaches a moderate temperature, and the vapour produced is modest in volume and cool at the lips, which is exactly what a narrow air path can carry. A low value does the opposite. More current passes for the same voltage, the wire reaches temperature faster and hotter, and the volume of vapour rises sharply, which then demands a wide airflow to stay bearable. There is a second, quieter effect. The surface area of the element and the size of the wicking ports scale with the value, so a low value coil also drinks more e-liquid per puff and expects a thicker blend to keep up with it. ## Reading the bands: how coil resistance maps to draw style British product pages tend to quote three broad bands, and although the boundaries shift slightly from one retailer to another, the logic behind them is consistent. Above roughly 1 ohm sits the mouth to lung territory. These coils are the ones fitted to compact pod kits and narrow bore tanks, they run at single figure or low double figure wattages, and they suit the tight draw covered in our guide to [MTL vaping](/uk/mtl-vaping-explained/). The band from around 0.6 to 1 ohm is the intermediate zone. Vapour volume climbs, the throat sensation softens, and this is the range most often quoted for a restricted direct draw, where flavour definition tends to be at its best. Below roughly 0.6 ohm the setup becomes genuinely sub ohm. Power requirements rise steeply, the device runs hot, and this band belongs to the open configurations described in our comparison of [DTL and RDL](/uk/dtl-and-rdl-vaping/). Treat these as bands rather than hard walls. A 0.8 ohm mesh cartridge in a pod kit and a 0.8 ohm coil in a large tank with a wide open base will not feel remotely alike, because the airflow around them is not the same. ## Matching coil resistance to wattage and airflow Three settings have to move together, and the order in which you set them matters more than most guides admit. Choose the coil first, then the power, then the airflow. The coil comes first because it fixes the frame. Every manufacturer prints a working wattage range directly on the coil body, and that range is not a suggestion: below it the vapour is thin and lifeless, above it the wick cannot keep pace. Power comes second, always starting at the low end of the printed range. Move up a watt at a time until the flavour opens out, then stop. The point where it stops improving is the point where it will start degrading. Airflow comes last. Close it fully, then open it in small increments, judging the effort at the lips rather than the cloud, until the air passes freely enough but the draw still gives you something to pull against. Priming is the step that gets skipped and then regretted. A new coil needs its cotton fully saturated before the first puff, which means wetting the visible wicking ports, filling the tank and then leaving it standing for several minutes. Give the first few draws less power than the setting you intend to settle on. A coil that has been eased into service holds its flavour for noticeably longer than one fired hard from cold. The classic mismatch is a low value coil behind an almost closed airflow. The heat has nowhere to go, the vapour arrives hot and stifling, and the setup gets blamed when the settings are at fault. ## E-liquid, consumption and coil life Ratio has to follow the value. A high value coil with fine wicking channels wants a thinner blend weighted towards propylene glycol, which reaches the element quickly and carries flavour cleanly. A low value coil expects the opposite. A blend weighted towards vegetable glycerine is thick enough to keep large wicking ports saturated at high power, and using a thin blend there invites flooding, leaks and spitback. Consumption scales with the same axis, and under British rules that is not a trivial detail. With tanks capped at 2 ml and nicotine bottles at 10 ml, a low value coil at high wattage empties both at a pace that a high value coil simply does not. Coil life follows too. Sweetened e-liquids caramelise on the element and shorten it regardless of value, but a hot running low value coil reaches that point faster, and the first burnt note is the signal to change it rather than to push through. Battery safety deserves a mention as the value drops. Low value coils draw considerably more current, so the cell and the device have to be rated for it, and a damaged or unbranded battery has no place anywhere near a sub ohm build. ## Frequently asked questions ### What value suits a tight mouth to lung draw? Generally above 1 ohm, sometimes around 0.8 ohm on modern mesh cartridges. These heat gently, produce a small volume of vapour and work with the restricted air path such devices are built around. ### Is a low value coil more dangerous? It draws more current, so it requires a device and a cell rated for the load. Damaged wraps, unbranded cells or mechanical devices without protection are where problems actually arise. ### Does the value change how flavour comes through? Yes. A lower value runs hotter and produces more vapour, which reads as more intense but less precise, while a higher value tends to give sharper definition on a small volume of vapour. ### Can any coil be fitted to any device? No. Each device accepts a specific range published by the manufacturer, and fitting a value outside it gives a poor result at best and a refusal to fire at worst. ### How often should a coil be replaced? Usually somewhere between one and three weeks, depending on the blend and how heavily it is used. Sweetened e-liquids shorten it, and any burnt note means it is already overdue. ## Getting the number right the first time None of this is a technical detail reserved for enthusiasts. The value on the coil is the setting that decides what kind of vape the device produces, and it is the one worth choosing deliberately before anything else is touched. Work in the same order every time. Start from the draw you actually want, pick the coil resistance band that serves it, set the wattage at the bottom of the printed range, then open the airflow gradually until the draw sits where you want it. Then let the e-liquid follow rather than lead. A thin blend for a high value coil, a thicker one for a low value coil, and a strength chosen for your own comfort within the legal ceiling rather than copied from a forum. Do that and the great majority of everyday annoyances never appear at all. When coil resistance, power and airflow agree with each other, harsh draws, burnt notes and weeping tanks mostly stop happening on their own, and the ones that remain are covered in our guide to [vaping comfort](/uk/vaping-comfort-problems/). Editorial content for adult readers only. Vaping products usually contain nicotine, a substance that causes addiction. Not for sale to under-18s in the United Kingdom. This article is not a buying recommendation.