If you own a Geekvape Aegis Legend 2, Aegis Solo 3, or Zeus Sub-Ohm tank and your included coils have burned out, you are now looking at a product page showing three or four different resistance options, some labelled XM Boost and some not, with no clear explanation of which one fits your specific device. This guide answers that question with verified manufacturer specifications. It also covers wattage matching, liquid compatibility, coil lifespan, and how to confirm authenticity before handing over money in a market where clones of these coils are common.
There is no refund path at KandyVape if you order the wrong coil. That fact is the reason this guide is this detailed.
The Geekvape Z coil series is a family of push-fit, sub-ohm, direct-to-lung (DTL) replacement coils available in 0.15Ω, 0.2Ω, 0.25Ω, and 0.4Ω resistances, with the current XM Boost generation rated at 70-85W (0.15Ω XM), 70-80W (0.2Ω XM), and 50-60W (0.4Ω XM). The 0.25Ω standard coil runs at 45-57W. All Z series coils are designed for high-VG freebase e-liquid; the XM Boost variants are explicitly not recommended for nicotine salt. Compatible devices include the Aegis Legend 2 (L200), Aegis Legend 3, Aegis Legend 5, Aegis Solo 3 (S100), Aegis Max 2, Zeus Sub-Ohm tanks (multiple generations), Obelisk 120FC, T200, and Z200. KandyVape stocks the 0.2Ω and 0.25Ω variants at 400 BDT for a 5-pack.
The Z Series Naming Confusion: Zeus, Z, and XM Explained
The first thing that trips buyers up is the name change. Geekvape sold the same coil family under the “Zeus” name for several years. The same coils are now labelled “Z series.” If you are looking at a grey-market listing that says “Zeus Z1 Mesh Coil” or “G Coil Zeus Formula,” those are legacy names for the same physical coil family. They fit the same devices and use the same push-fit base. The coil codes changed, not the hardware interface.
The second naming layer is the XM Boost distinction. The current generation of Z coils carries “XM Boost” in the name. According to Geekvape’s official Z Series Coil product page, the XM Boost version delivers approximately 100% longer lifespan compared to the previous generation, rated at around 50ml to 60ml of e-liquid per coil under typical use. Both the XM Boost and the previous generation use the same physical interface, meaning any device that accepted the older Z coils accepts the XM Boost version without modification.
Resistance Options, Wattage Windows, and Who Each Coil Is For
The resistance you choose determines the wattage your device needs to run, how your draw feels, and how fast your e-liquid is consumed. These are not arbitrary preferences. Running a coil significantly outside its wattage window causes the cotton to burn, which produces a harsh taste and destroys the coil. Running it too low causes flooding, gurgling, and poor vapour. The numbers on the coil label are there for a reason.
Here is the verified specification table for the full Z coil range, drawn directly from the manufacturer’s spec sheet:
| Coil Name | Resistance | Wattage Range | Type | Draw Style | Best E-liquid |
| Z0.15 XM Boost | 0.15Ω | 70-85W | Kanthal mesh | DTL | 70%+ VG freebase, ≤3mg |
| Z0.2 XM Boost | 0.2Ω | 70-80W | Kanthal mesh | DTL | 70%+ VG freebase, ≤3mg |
| Z0.25 (standard) | 0.25Ω | 45-57W | Dual mesh | DTL | 70%+ VG freebase |
| Z0.4 XM Boost | 0.4Ω | 50-60W | Kanthal mesh | DTL | 70%+ VG freebase, ≤6mg |
| Z0.15 (legacy) | 0.15Ω | 80-90W | Kanthal mesh | DTL | 70%+ VG freebase |
| Z0.15 SS316 (legacy) | 0.15Ω | 60-70W | SS316 mesh | DTL | 70%+ VG freebase |
The 0.2Ω XM Boost is the most common choice for upgraders in the Dhaka market because it is the coil most Aegis and Zeus kit bundles have shipped with for the past two years. It runs at 70-80W, produces substantial vapour, and has the broadest device compatibility of the current range. If you are replacing a coil that came with your kit and you are not sure which resistance it was, check the resistance value printed on the coil body itself. It is stamped on the side.
The 0.25Ω standard coil runs at 45-57W, which means your device draws less power, consumes less e-liquid per puff, and the dual mesh structure spreads heat differently than the single-mesh 0.2Ω. It is a reasonable choice if your device runs hot at 70W-plus or if you prefer a slightly cooler draw. It is the slower-burning option of the two we currently stock.
The 0.4Ω XM Boost runs at 50-60W and produces a cooler vape than the 0.2Ω at the same device setting, which some users prefer when transitioning from a device they found too warm. It is not a mouth-to-lung (MTL) coil. At 0.4Ω with an open airflow DTL tank, it still draws like a direct-lung device, not like a cigarette. This distinction matters for switchers expecting a tight cigarette-like draw: the Z coil series across all resistances is built for DTL vaping.
Device Compatibility: Which Z Coil Fits Which Tank
This is the highest-risk section of any coil guide in a no-refund environment. A coil that does not fit your tank is 400 BDT wasted with no return path. The following compatibility information is verified against Geekvape’s official product store listing. Devices listed as compatible by the manufacturer are marked. If your device is not on this list, the compatibility is unconfirmed and you should check the printed coil type on your current coil before ordering.
| Compatible Device | 0.15Ω XM | 0.2Ω XM | 0.25Ω | 0.4Ω XM |
| Aegis Legend 2 (L200) | Yes | Yes | Yes | Yes |
| Aegis Legend 3 | Yes | Yes | Yes | Yes |
| Aegis Legend 5 | Yes | Yes | Yes | Yes |
| Aegis Max 2 | Yes | Yes | Yes | Yes |
| Aegis Solo 3 (S100) | Yes | Yes | Yes | Yes |
| Zeus Sub-Ohm Tank (all generations) | Yes | Yes | Yes | Yes |
| Z Fli Tank | Yes | Yes | Yes | Yes |
| Z Fli 2 Tank | Yes | Yes | Yes | Yes |
| Z Subohm SE Tank | Yes | Yes | Yes | Yes |
| Z Subohm Tank 5 | Yes | Yes | Yes | Yes |
| Obelisk Tank | No | Yes | No | Yes |
| Obelisk 120FC | No | Yes | No | Yes |
| Obelisk 200 | No | Yes | No | Yes |
| T200 (Aegis Touch) | Yes | No | No | Yes |
| Z200 | Yes | No | No | Yes |
| P Subohm Tank | No | Yes | No | Yes |
Note on the Obelisk series: The Obelisk tanks accept the 0.2Ω and 0.4Ω Z coils but not the 0.15Ω XM or the 0.25Ω dual mesh. If you own an Obelisk 120FC kit and you order a 0.25Ω coil based on a generic “Z coil guide,” it will not seat correctly. Check the printed value on your current coil or the device manual before ordering.
The Nicotine Salt Question: Read This Before You Order
This is where the most expensive mistakes happen. The Geekvape Z coil FAQ on the official store page states that Z series coils are compatible with nicotine salt e-liquids. However, the current XM Boost version product page explicitly states the opposite: “Not recommended: Nicotine salt e-liquids.” These are two different pieces of official content giving two different answers.
Here is the technical reason the current recommendation is to avoid salt nicotine with XM Boost coils. The 0.2Ω and 0.15Ω coils operate at 70-80W or higher. That wattage, combined with the high nicotine concentration typically found in nicotine salt products (25mg or 50mg), produces a throat hit that most users find physically uncomfortable. The device is vaporising liquid faster than a pod system running a 1.2Ω or 1.4Ω coil at 12-16W. The nicotine delivery rate is substantially higher per puff. Running 50mg salt nicotine through a 0.2Ω coil at 75W is not a pairing that works in practice, regardless of what a compatibility footnote says.
Propylene glycol, which carries both flavour and the throat sensation in e-liquids, is classified by the US Food and Drug Administration as generally recognised as safe for use in food applications at the concentrations used in e-liquid. The question for coil selection is not the carrier’s safety profile; it is the nicotine concentration reaching your airway per puff, which is a function of resistance, wattage, and liquid concentration together.
For the Z coil at any resistance, use freebase nicotine at 3mg to 6mg maximum, with a VG/PG ratio of 70% VG or higher. High-VG liquid wicks more slowly, which is why adequate priming matters. Thin, low-VG liquids wick too fast for the mesh structure and will flood the coil.
Priming a New Z Coil: The Steps That Actually Protect Your Investment
A brand-new coil with dry cotton will burn in the first three to five puffs if you fire it without priming.
That burnt cotton taste does not wash out. The coil is functionally dead from that point, and there is no return policy that covers user error.
The process is straightforward. First, install the coil into the tank base before filling. The Z coil uses a push-fit design, so press it firmly straight down until it seats. Do not twist it. Second, fill the tank completely with your e-liquid before firing. Third, set your device to the lowest end of the wattage range for your chosen coil. For a 0.2Ω XM Boost, that is 70W. For a 0.25Ω, start at 45W. Fourth, wait a minimum of five minutes without firing after filling. If you are using a higher-VG liquid (above 70% VG), wait ten minutes. The thicker the liquid, the slower the cotton absorbs it. Fifth, if you want to accelerate priming, place two or three drops of e-liquid directly onto the cotton through the wicking ports on the side of the coil before installation. This is optional but reduces the risk of a dry hit on the first pull.
Once the tank has sat for five to ten minutes, take two or three gentle pulls without activating the device. This draws liquid through the wicking ports. Then fire at the lowest end of the range, and work up in 5W increments over the first session to break in the mesh.
Coil Lifespan: What the Manufacturer States and What Affects It
Geekvape rates the Z XM Boost coil at approximately 50ml to 60ml of e-liquid per coil under the usage guidelines on their product page. That is a manufacturer reference figure, not a guarantee. Actual lifespan depends on at least four variables that change significantly between users.
Wattage is the biggest factor. Running a 0.2Ω coil consistently at 80W, the top of its range, consumes cotton faster than running it at 70W. The mesh heats more aggressively, the wick cannot resaturate between puffs as easily, and the coil life shortens. Running at the lower end of the rated range extends coil life. This is not a speculation; it is a function of thermal load on the cotton fibre.
Liquid composition is the second variable. High-sugar e-liquids caramelise on the mesh and accelerate carbon buildup, which shortens coil life regardless of wattage. High-VG liquids wick more slowly; if your chain-vaping pace outstrips wicking speed, you get dry spots on the cotton that burn and shorten coil life.
Chain vaping is the third variable. Every puff that does not allow the cotton to reabsorb liquid moves you closer to a dry hit. Five-second gaps between puffs at standard wattage are the practical minimum for the Z coil’s cotton configuration.
Liquid storage time in tank is the fourth. E-liquid left in a tank for several days at room temperature, particularly in Dhaka’s climate, can darken the cotton through oxidation. This is not always a sign of coil failure, but it signals that replacement is coming.
When to replace: consistent burnt or metallic taste that does not clear with a fresh fill, visible carbon darkening on the mesh visible through the tank glass, or a noticeable drop in vapour volume at the same wattage setting.
Authenticity Verification: How to Confirm Your Z Coil Is Real
Counterfeit Geekvape Z coils circulate in the Dhaka market. The packaging is close enough to pass a casual inspection. The coil itself works for a day or two before the mesh produces a harsh, chemical taste. In a no-refund environment, this is a total loss.
Geekvape uses a 14-digit anti-counterfeiting code on a scratch-off label affixed to every authentic product. After purchase, locate this label on the packaging, scratch off the coating, and enter the code at geekvape.com/verify. An authentic code returns a product confirmation. A code that returns an error or “already verified” result indicates either a clone or a unit whose code was already registered by a previous buyer, which means the packaging was resealed.
Physical inspection points that matter before you scratch and verify:
The scratch-off label on authentic units has a consistent holographic pattern specific to Geekvape, not a generic silver sticker. The coil body should be uniform in colour, with no visible gaps between the mesh and the cotton ends. The push-fit end should seat smoothly into your tank with a firm click; a loose fit or a fit requiring force suggests a dimensional difference from genuine tooling. The printing on the packaging should be sharp and clean. Blurry text, misaligned graphics, or spelling errors are immediate indicators of a clone.
We verify authenticity codes on every unit we receive.
If you are visiting the Mohammadpur shop at Shop #22, Level #3, Sahabuddin Plaza, you can inspect the packaging and run the verification code before paying.
A Note on Vaping and Health
This guide does not make health claims about vaping. Cancer Research UK’s position, as stated on their published information page on vaping and health, is that research so far shows legal e-cigarettes are far less harmful than smoking but are not risk-free, and that long-term effects are not yet fully understood. We report that position as a named health body’s published finding. We do not assert it as KandyVape’s own conclusion. Adults making decisions about nicotine products should consult their own medical advisors.
FAQ
Q1: Are Geekvape Z coils and Geekvape Zeus coils the same product?
Yes. Geekvape rebranded the Zeus coil line as the Z series. The coil codes changed (from names like Mesh Z1 or G Coil Zeus Formula to Z0.2, Z0.25, etc.) but the physical push-fit interface and device compatibility are identical. If your device used Zeus coils, it accepts Z series coils.
Q2: I have a 0.2Ω Z coil. Can I use a 50mg nicotine salt liquid with it?
We do not recommend it. The 0.2Ω coil operates at 70-80W, which is high-wattage DTL territory. At that wattage, the nicotine delivery per puff from a 50mg salt liquid will be severe enough that most users find it physically uncomfortable within a session. The XM Boost product page also explicitly states nicotine salt is not recommended for the XM Boost coils. Use freebase nicotine at 3mg to 6mg with 70%+ VG instead.
Q3: How do I know if my Z coil is a genuine Geekvape product?
Every authentic Geekvape Z coil pack carries a 14-digit scratch-off code on the packaging. Enter it at geekvape.com/verify. An error result or “already used” message means the product is not authentic or the packaging has been opened and resealed. Also inspect the coil body for uniform mesh, sharp packaging print, and a firm push-fit seat in your tank.
Q4: If I order before 3:00 PM, when will my coils arrive in Dhaka?
KandyVape dispatches daily at 3:00 PM, including weekends. Orders placed before that cutoff dispatch the same day. Typical delivery windows depend on your location; confirm the delivery estimate for your area at checkout or via the contact page. For orders above 3,500 BDT, shipping is free.
Q5: What if the coil does not suit my device or my liquid after I order?
KandyVape operates a strict No-Return / No-Refund policy on all products.
That is the specific reason this guide exists in as much detail as it does. Verify your device against the compatibility table above, confirm the resistance value on your existing coil before ordering a replacement, and check the authenticity code on arrival. If you are uncertain which variant your device uses, the team at the Mohammadpur shop can confirm it against the hardware in front of them before you commit to a purchase.
Q6: Can I use the 0.25Ω coil if my device maximum output is only 50W?
Yes. The 0.25Ω coil’s rated range is 45-57W. A device with a 50W maximum output can run this coil within its rated range. It will not run the 0.2Ω XM Boost effectively, which starts at 70W.
Q7: What is the difference between the 0.25Ω coil and the 0.2Ω coil beyond resistance?
The 0.25Ω is a dual mesh coil. The 0.2Ω XM Boost is a single mesh coil. Dual mesh spreads the heating surface differently, runs at lower wattage, and wicks at a pace suited to 45-57W. The 0.2Ω single mesh concentrates heat more directly and requires the higher 70-80W range to perform correctly. Neither is universally superior; the right choice depends on your device’s wattage range and your preferred vaping intensity.
Where to Go From Here
KandyVape stocks the Geekvape Z Coils in 0.2Ω and 0.25Ω at 400 BDT for a 5-pack.
If you are unsure which resistance your device uses, the printed value is on the side of your current coil. If that coil is already discarded, check the device manual or bring your hardware to Shop #22, Level #3, Sahabuddin Plaza, Adabar, Mohammadpur, Dhaka, where we can confirm the correct coil before you pay. Orders placed before 3:00 PM dispatch the same day.
