# GTX One Coils, Which Ones Fit and How to Change Them > GTX One coils explained, from the 0.6, 0.8 and 1.2 ohm values that fit the GTX Tank 18 to why lower ones are ruled out and how to change a coil. The GTX coil shelf lines up seven resistance values in near-identical boxes, and many listings describe them as compatible with a long list of Vaporesso devices. If you own the Vaporesso GTX One, the real picture is narrower. Some of those coils have no business in its tank, and the wattage ranges shift from one retailer to the next. Before ordering **GTX One coils**, it pays to know what the device actually accepts. ## Which GTX One coils should you choose? **GTX One coils** come from Vaporesso's GTX family, in three usable values, the 0.6, the 0.8 and the 1.2 ohm, all of them mesh. The kit ships with a 0.8 ohm coil already fitted inside the GTX Tank 18 and a spare 1.2 ohm coil in the box. Of the three, the 1.2 ohm gives the tightest draw, the 0.8 ohm a slightly more open one, and the 0.6 ohm the fullest vapour the device can make use of. The 0.15, 0.2 and 0.3 ohm values, on the other hand, are not suited to this kit, even though the packaging carries the same GTX name. ## Why do lower values not work on the GTX One? Two reasons stack up, one down to the mod and the other down to the tank. Together they explain why a coil sold under the GTX name can turn out to be useless on this particular kit. ### The 40W ceiling of the mod The GTX One mod fires from 5 to 40W. The 0.2 ohm coil, however, is rated from 45 to 60W, and the 0.15 ohm from 60 to 75W. Both ask for more than the device can deliver, before they even reach the tank. The 0.3 ohm, rated from 32 to 45W, is within the mod's reach on paper. It would still leave only a narrow window between 32 and 40W, the bottom end of its range. ### The GTX Tank 18 and its exclusions Two retailers state on their listings that the 0.2 and 0.3 ohm GTX coils are not compatible with the GTX Tank 18, and one of them adds the 0.15 ohm to the list. The 0.3 ohm, which the mod could have powered, is therefore ruled out by the tank itself. The 0.4 ohm, finally, does not appear in any of the compatibility lists we checked for this tank. Without confirmation, the safer choice is to stick to the three values the kit was designed for. ## 0.6, 0.8 or 1.2 ohm, which draw suits your GTX One coils? Each value matches a way of inhaling. Mouth-to-lung, or MTL, works in two steps, with the vapour held in the mouth first. Restricted direct-to-lung, or RDL, sends the vapour more directly while keeping the draw somewhat tight. | Value | Official range | Other range listed | Draw | |---|---|---|---| | 1.2 ohm mesh | 8 to 12W | 7 to 11W | MTL, the tightest | | 0.8 ohm mesh | 12 to 20W, 18W suggested | 12 to 16W | Tight RDL | | 0.6 ohm mesh | 20 to 30W, 28W suggested | 20 to 26W | Looser RDL | The other range column is not a typo. Several retailer listings print lower limits than the official column, the 0.8 ohm in particular, given as 12 to 16W rather than 12 to 20W. Vaporesso's own page contradicts itself on the 1.2 ohm mesh, rated at 8 to 12W in its description and 7 to 11W in its spec table. With new GTX One coils, starting at the bottom of the more cautious range and climbing 1W at a time avoids heating cotton that is not yet fully soaked. The mod also offers a Smart mode, which matches the power to the coil it detects. It is handy at first, and you can still fine-tune by hand afterwards. ## How do you change GTX One coils? A coil change takes a few minutes and is done from the bottom of the tank. Three steps, in this order, keep leaks and burnt hits away from the very first puff. ### Taking the tank apart Unscrew the GTX Tank 18 from the mod, turn it upside down and unscrew its base. Then pull the old coil straight out, since GTX coils have no thread and simply push into place. ### Priming and fitting the new coil Before fitting it, drip 4 to 5 drops of e-liquid onto the cotton, through the centre and the side openings. Then push the **GTX coil** fully home in its seat, keeping it straight, and screw the base back on. ### Filling and waiting Filling is done from the top, by unscrewing the top cap. Aim for the edge of the tank rather than the central tube, then screw the tank back onto the mod. Give the cotton a few minutes to soak before vaping, starting at the bottom of the range shown above. As with [Geekvape coils](/uk/geekvape-coils/), a new coil primed with patience lasts longer. ## How long do GTX One coils last? The figures in circulation do not agree. One retailer near the top of the search results talks about 15 to 20 refills. Vaporesso's official online shop is far more cautious, with 5 to 6 refills before flavour fades for its direct-to-lung coils, and up to 7 to 8 refills for the 0.8 and 1.2 ohm. On a 2ml tank, the UK legal maximum, that works out at roughly 14 to 16ml of e-liquid for a tight-draw coil. The e-liquid matters a great deal. A very sweet recipe usually gunks up the cotton faster than a fruit or menthol one, and a wattage set at the top of the range also wears the coil out sooner. Three signs mean it is time for a new one. Flavour turns flat and vapour weakens, gurgling starts, then a burnt taste sets in. At that point no rinse will bring **GTX One coils** back, and the only fix is a replacement. The same reasoning applies to other tanks running pre-made coils, such as the [Geekvape Zeus tank](/uk/geekvape-zeus/). ## FAQ Five questions GTX One owners often ask, beyond picking the right value. ### Which e-liquid works best in the Vaporesso GTX One? With the tight coils in the kit, retailers point towards thinner e-liquids, nicotine salts included, especially with the 1.2 ohm. A very high-VG e-liquid, which is thicker, soaks into a low-wattage coil more slowly. In the UK, nicotine e-liquid is capped at 20mg/ml and sold in bottles of 10ml at most. ### How do you set up the Vaporesso GTX One? Five quick presses on the fire button switch the mod on or off, and three presses lock the settings. The plus and minus buttons adjust the wattage. Pressed together, they open the menu, which offers variable wattage, variable voltage, Smart mode and a factory reset. ### Which tank goes with the GTX One? The kit is built around the GTX Tank 18, supplied with the mod. This tank unscrews from the mod, fills from the top and sets its airflow with a ring at the base. It takes GTX coils, and those set the draw far more than the tank itself does. ### What battery does the Vaporesso GTX One use? A built-in 2000mAh battery, which cannot be swapped. It charges through a USB-C port at 2A. The 0.69-inch OLED screen shows the wattage set and the battery level. ### Does the GTX One Pro take the same coils? Yes as far as the family goes, with the same exclusions. The GTX One Pro uses the X Tank T, which is compatible with GTX coils, and a 3000mAh battery. The 0.15, 0.2 and 0.3 ohm coils are listed as incompatible with it too. ## GTX One coils, what to check before you order Three values are all this kit needs, the 0.6, the 0.8 and the 1.2 ohm. Lower ones fall outside either the mod's power or the GTX Tank 18 compatibility lists. Wattage ranges vary between listings, which is why starting low and working up gradually makes sense. The GTX Tank 18 is listed at 3ml, above the 2ml cap that the Tobacco and Related Products Regulations 2016 set for tanks in the UK. The kit also includes a spare glass tube rated at 2ml, the capacity to look for in UK shops. Chosen, primed and set with care, **GTX One coils** get the best out of a simple kit, and the same way of reading a spec sheet applies to every consumable on a vape. ## On the same topic - [Geekvape coils, which series fits your device](/uk/geekvape-coils/) - [Geekvape Zeus tank, which version to choose](/uk/geekvape-zeus/) - [AIO mod explained, what it is and who it suits](/uk/aio-mod/) Editorial content for adult readers only. Vaping products can contain nicotine, which is a highly addictive substance. Vaping products are not for sale to anyone under 18 in the UK. This article is not a purchase recommendation.