GTi coils, the four Vaporesso values worked through
Retailer listings agree on the wattage ranges of GTi coils, and that is exactly the problem. A range of 75 to 90 W tells you neither where to set your mod nor what that power asks of a battery. Vaporesso does publish a precise setting for three of its values, yet few listings repeat it. The lab starts from those figures, then runs them through Ohm’s law to see what each head really demands.
GTi coils in brief, four mesh values for direct lung vaping
GTi coils are Vaporesso mesh coil heads, designed according to the manufacturer for direct lung vaping. They come in boxes of five and in four values, which the retailers we checked describe with the same ranges.
| Value | Stated range | Setting recommended by Vaporesso |
|---|---|---|
| 0.15 ohm | 75 to 90 W | 85 W |
| 0.2 ohm | 60 to 75 W | 65 W |
| 0.4 ohm | 50 to 60 W | 55 W |
| 0.5 ohm | 30 to 40 W | not published |
The first three appear on the manufacturer’s GTi platform page. The 0.5 ohm no longer does, but several retailers still sell it with the same 30 to 40 W range. On that same page, Vaporesso states that the GTi platform will be used for its coming direct lung products.
The recommended setting, the figure listings leave out
Vaporesso pairs each range with a suggested value, and that value does not sit in the same place from one head to the next. It is the most useful number for a first setting.
On the 0.15 ohm, 85 W sits two thirds of the way up the range, close to the top. On the 0.2 ohm, 65 W stays in the first third, and on the 0.4 ohm, 55 W lands exactly in the middle. Starting every one of these GTi coils at the bottom of its range therefore means different things depending on the value. On the 0.15 ohm, the bottom of the range is still 10 W below the setting the manufacturer aims for.
The lab’s method is the same as for any fresh head. Start a few watts below the recommended value, climb in steps of 2 or 3 W, and stop as soon as the vapour runs too hot or the flavour turns. Our vape wattage chart by ohm places these values among other coil families.
What each GTi coil asks of the battery
A wattage range translates into voltage and current, two quantities the mod has to supply. The calculation follows from Ohm’s law, with voltage equal to the square root of power times resistance, and current equal to the square root of power divided by resistance.
The 0.15 ohm, the hungriest for current
At 85 W, the 0.15 ohm head receives about 3.57 V and 23.8 A. At the top of its range, 90 W, the current reaches 24.5 A. It is the value that works the mod and its batteries hardest.
The 0.2 ohm, one step down
At 65 W, the 0.2 ohm head receives about 3.61 V and 18 A, rising to 19.4 A at 75 W. The voltage stays close to the 0.15 ohm figure while the current falls by roughly a quarter.
The 0.4 and 0.5 ohm, more modest currents
At 55 W, the 0.4 ohm head receives about 4.69 V and 11.7 A. The 0.5 ohm, between 30 and 40 W, draws 7.7 to 8.9 A at 3.87 to 4.47 V. Both values need a higher voltage, but two to three times less current than the 0.15 ohm.
What these figures mean for the battery cell
On a regulated mod, the current drawn from the cell is not the same as the current through the coil, because the electronics convert the voltage. A rough figure comes from dividing the power by the cell voltage. At 85 W from 3.7 V, that is already close to 23 A before conversion losses, to be compared with the continuous discharge rating published by the cell’s maker. With the 0.4 ohm set to 55 W, the same calculation drops to about 15 A. A dual cell mod shares that load between its two batteries.
Which tanks take GTi coils
Listings agree on a core of compatible tanks and diverge beyond it. The lab keeps only what several sources confirm.
The retailers we checked all name the iTank family, meaning the iTank, the iTank 2 and the iTank T. Several also list the Target 100 and Target 200 kits, which ship with an iTank. Compatibility is read from the tank rather than from the kit name.
Other devices appear on a single listing with no confirmation elsewhere. Before ordering for a device missing from this list, the tank’s manual is the source to check. GTi heads are also distinct from the GTX and GT2 coils made by the same brand, which are separate families sold under their own names.
In the UK, refillable tanks are capped at 2 ml, a rule that concerns the iTank you fit rather than the coil head itself. Vaporesso lists the same five coils in its TPD box as in the standard one.
Priming and looking after GTi coils
A high power mesh head heats a large area of cotton very quickly. Cotton that is not fully soaked therefore burns from the very first puffs.
Before the first draw, put a few drops of e-liquid on the cotton ports, fill the tank, then leave it to rest for a few minutes. Our guide on how to prime a vape coil covers each step. Take the first puffs below the recommended setting before climbing back up.
On lifespan, a sweet recipe generally clogs mesh faster than a light fruit or menthol liquid, and running a head at the top of its range speeds up wear. A lasting burnt taste or fading flavour signals it is time for a new head, as our piece on how long a vape coil lasts explains in more detail.
FAQ
These five questions come up under retailer listings and in related searches. The answers draw on the manufacturer and the retailers we checked.
Which GTi coil suits a first step into direct lung vaping?
The 0.4 ohm has the lowest range of the three values Vaporesso still publishes, with a suggested 55 W and a current of about 11.7 A. It asks less of the mod than the 0.15 or 0.2 ohm.
Can GTi coils take nicotine salts?
Vaporesso designs the GTi for direct lung vaping, with published ranges of 50 to 90 W. The manufacturer does not mention nicotine salts on its page, and these liquids are mostly offered for a tight draw at modest power, a use some way from the GTi’s. In the UK, nicotine e-liquid is capped at 20 mg/ml whatever the coil.
How many heads are in a box of GTi coils?
Vaporesso states five GTi coils per box for each value. Its product page shows the same contents for the TPD version sold in markets that apply the 2 ml tank rule.
Can you go above the wattage range of a GTi coil?
The manufacturer publishes no data beyond the upper limit. Above it, the coil heats faster than the cotton can soak, with a risk of burnt taste and faster wear.
Why is the 0.5 ohm harder to find?
Vaporesso’s current page only lists the 0.15, 0.2 and 0.4 ohm. Shops that still stock the 0.5 ohm rate it at 30 to 40 W, in boxes of five like the other values.
Choosing GTi coils by power, then by current
A wattage range is not enough to set up a GTi. The value Vaporesso recommends, 85, 65 or 55 W depending on the head, gives a better starting point, and Ohm’s law shows that the 0.15 ohm pulls nearly 24 A where the 0.4 ohm stays at about 12.
All that remains is to fit the head in an iTank family tank and prime it properly. Read this way, GTi coils show what the lab argues for on every coil head, choosing a value for what it asks of the hardware as much as for the vapour it makes.
Editorial content for adult readers only. Nicotine vaping products are not for sale to anyone under 18 in the UK. Vaping products can contain nicotine, a substance that causes addiction. This article is not a buying recommendation.
