Uwell Caliburn GK3 Pod Kit Grey

Overview

The Uwell Caliburn GK3 Pod Kit Grey by Uwell in Grey at 0mg. Free UK delivery over £20, same-day dispatch on weekday orders before 4pm.

Uwell Caliburn GK3 Pod Kit overview

The Uwell Caliburn GK3 Pod Kit is a compact, refillable pod system from Uwell, the manufacturer behind the long-running Caliburn range. It belongs to the mouth-to-lung (MTL) category, which means you draw slowly on the mouthpiece, hold the vapour briefly in your mouth and then inhale, in much the same way you would draw on a cigarette. For anyone moving away from smoking, or from the single-use devices that used to dominate UK shelves, this is the vaping style that tends to feel most familiar from the very first puff.

The key difference from a disposable is that the GK3 is built to be used for months rather than days. You fill the pod with e-liquid of your own choosing, recharge the internal battery through a USB-C port, and swap the pod when the coil inside it eventually wears out. Since the single-use vape ban came into force in the UK on 1 June 2025, refillable kits like this one have become the mainstream route for adult smokers who want a simple, pocketable device without the waste of a throwaway product.

Here is a quick summary of what the kit offers, based on the way the Caliburn GK-series is designed:

• Format: closed, refillable pod system for MTL vaping
• Pod capacity: 2ml, which is the maximum UK rules permit for a pod or tank
• Charging: USB-C, so the same type of cable you use for most modern phones and accessories will do
• Operation: draw-activated like most kits in this class, so in normal use there is no button to hold down
• Pairs well with: nicotine salt e-liquid in the 10mg/ml to 20mg/ml range
• Variants: five variants are listed in this product family, so use the selector on the page to choose yours

What is in the box can differ slightly between listings, so check the description on this page to confirm whether a pod is pre-fitted and whether a spare is included. As a rule you should expect the device, a pod, a USB-C charging cable and a user guide. You will need to buy e-liquid separately, and it is worth adding a bottle to your basket at the same time so you can start the day the parcel arrives.

Vaping is not risk-free and nicotine is addictive. This kit is intended for adult smokers and existing vapers aged 18 or over. If you have never smoked, you do not need a device like this.

Performance and vapour delivery

The GK3 is designed around a simple promise: steady, predictable output without any settings to fiddle with. Because it is a draw-activated MTL kit, the firing circuit wakes the coil when it senses airflow through the mouthpiece. A gentle two to three second draw is all it needs. Pull harder and faster, as you might on a sub-ohm tank, and you will mostly get restricted airflow and a hot-feeling vapour rather than bigger clouds. This is by design: MTL pods trade vapour volume for throat hit, concentrated flavour and efficient nicotine delivery, and that combination is exactly what many ex-smokers are looking for.

In practice, expect a small to moderate amount of vapour, a noticeable but not harsh throat hit with 10mg/ml to 20mg/ml nicotine salts, and a warm rather than hot temperature. Output stays reasonably consistent through most of the battery charge. As the battery nears empty the vapour can thin out slightly, which is normal for any small lithium cell and is usually your cue to plug in.

How many puffs will a pod give you? Unlike a disposable, there is no printed puff count, because the number depends on you. As a rough guide, a full 2ml pod will typically last a moderate vaper somewhere in the region of several hundred puffs, which for many people works out to a day or two of use. Heavy chain-vaping, higher VG liquids and long draws all drain the pod sooner. Light, occasional use stretches it considerably. The practical upside of a refillable kit is that you can top up in seconds and are never throwing away a device with liquid still in it.

Things that influence performance:

• E-liquid thickness: thinner liquids (50/50 PG/VG) wick quickly through a small MTL coil and tend to give crisper flavour, while very thick liquids can starve the coil
• Draw length: slow, steady draws work with the coil, whereas short sharp pulls can cause spitting or weak output
• Pod age: output and flavour fade gradually as residue builds up on the coil
• Battery level: expect the most consistent results between a full charge and roughly half
• Priming: a freshly filled pod needs several minutes to soak the coil before its first use

If you are coming from a disposable, the GK3 will feel familiar but a little more controlled, and you never face the situation where a built-in battery dies halfway through the day with no way to recover it, because you simply charge it and carry on. If you are coming from a larger adjustable mod, expect it to feel restrained. It is not intended to compete on cloud size. It is a reliable everyday carry device for people who want to vape without thinking about it, and judged on that basis it does its job.

Flavour profile and what to expect from the pods

A pod kit does not have a flavour of its own. What you taste is whatever e-liquid you put in it, filtered through the coil, the airflow and the mouthpiece. What the GK3 contributes is a tight, MTL-style airflow and a modest coil temperature, both of which keep flavour concentrated and defined. Fruit, menthol and sweet dessert profiles come across clearly, and tobacco and classic flavours, which can taste flat in very airy setups, usually keep their character here.

Because there are five variants in this product family, it is worth being clear about what that choice means. The variants are the different versions of the kit you can select on the page, most commonly different colour options, and they change the look of the device rather than the taste. Taste is decided entirely by the e-liquid you choose. If you want to try several flavours, the most economical approach is to buy a few 10ml bottles and dedicate one pod to each flavour family, or rinse and fully dry the pod between changes.

Which e-liquids suit the GK3 best:

• Nicotine salts in 50/50 PG/VG: the natural match, smooth at 10mg/ml to 20mg/ml and quick to wick through a small coil
• Fruit and ice blends: bright and sharp, particularly clear in a tight airflow, though cooling agents can feel harsh at high strengths, so consider 10mg/ml if you plan to vape menthol heavily
• Tobacco and nutty profiles: consistent and not washed out, a sensible choice for smokers who want continuity
• Dessert and custard flavours: workable, but heavy sweeteners tend to build residue on the coil and shorten pod life
• Very high VG shortfill liquids: generally not suited to this kind of pod, as they are too thick and are designed for sub-ohm devices

A few habits improve flavour noticeably. Prime the pod properly before the first draw, do not overfill, and avoid mixing flavours in one pod without rinsing it, because residual taste lingers in the cotton. Many vapers find that flavour is at its clearest in the first week of a pod and tapers afterwards, so if everything starts to taste muted, the pod rather than the liquid is the likely culprit. It is also worth knowing about flavour fatigue: sticking to one sweet profile for weeks dulls your perception of it, and rotating between two or three profiles keeps things interesting.

One further point on taste is the first few draws from a fresh pod. A new coil sometimes carries a very slight manufacturing note, and the first puffs can taste faintly different from the rest. That usually clears within a few draws once the cotton is properly saturated and the coil has been fired a handful of times.

Design and build quality

The Caliburn name has always meant slim and pocketable, and the GK3 continues that approach. The body is a compact, rounded shape that slides into a jeans pocket or a small bag without bulk, and its weight is low enough that you hardly notice it when carrying it all day. The mouthpiece is shaped for MTL, relatively narrow with a comfortable rounded lip that works for both lip-over and lip-under habits.

The pod seats into the top of the device and is held in place with a firm connection, so it should not wobble when you carry the kit around. Check this each time you fit a pod, because a pod that is not fully seated can cause a no-fire or a dim light and, on rare occasions, a leak around the base. The fill port is sealed with a soft silicone plug that you lift or peel back to refill and press shut afterwards. Push it fully home, because an unseated plug is the most common cause of a leaking pod.

Build points worth knowing about:

• Materials: a mix of plastic for the pod and a lightweight body shell, which keeps weight down but means the finish can pick up light scratches over time
• Finish options: the five variants in this family give you a choice of looks, so pick whichever suits you
• Charging port: USB-C, which is reversible and widely compatible
• Fit and finish: pod, body and mouthpiece should line up cleanly, and if anything looks misaligned on arrival, contact us before using it
• Durability: fine for daily pocket carry, but it is a small electronic device and is not designed for repeated drops onto hard floors

Where does it fall short? Honestly, there is very little to customise. If you like adjustable airflow, an LED screen or swappable mouthpieces, you will find those features on larger kits. The GK3 deliberately keeps things simple, and for plenty of users that simplicity is the whole appeal, but it is a real limitation if you enjoy tinkering.

A little care keeps it looking and working properly. Pockets collect lint, so the charging port and the pod contacts benefit from an occasional wipe with a dry cotton bud. Keep the device out of hot cars and away from direct sunlight, since heat softens silicone seals and increases the chance of leaks. Carry it upright where possible, especially soon after filling, and wipe away any liquid on the outside of the pod before it has a chance to creep into the contacts. These are small habits, but they make the difference between a kit that lasts months and one that starts misbehaving after a few weeks.

Battery life and charging

The GK3 uses an internal, non-removable lithium-ion battery in the compact capacity range typical of slim pod kits, which means a few hundred milliamp-hours up to the high hundreds rather than the thousands you see in box mods. The exact capacity depends on the revision, so check the specification line on the listing. What matters in everyday use is that the battery is sized to match the modest power draw of an MTL coil, and that for most people one full charge covers a day of moderate use and often more.

Realistic expectations: a light vaper can stretch a charge over two days, a moderate vaper typically gets through a day, and a heavy vaper who chain-vapes in the evening will want to top up at a desk or in the car. Runtime depends on coil resistance, how long you hold each draw and how often you vape, so treat any figure as a ballpark rather than a promise.

Charging. Use the USB-C port with the supplied cable, or any decent quality USB-C cable, and a standard 5V charger. Charging from a laptop USB port also works. Small batteries like this usually fill in somewhere around an hour or two, and the indicator light tells you when charging is under way and when it has finished. Check the user guide for what each light colour or flash pattern means, as it varies between models.

Sensible charging habits:

• Do not leave the device charging unattended overnight or on soft surfaces such as a bed or sofa
• Avoid cheap unbranded chargers with no safety markings and stick to chargers from a reputable brand
• Do not charge a device that feels hot, looks swollen or has been dropped hard, and stop using it instead
• Do not charge in direct sunlight or in a hot car
• Keep it away from keys and coins in a pocket so the contacts cannot short

Battery lifespan. Lithium cells wear gradually. After a year of daily charging you may notice slightly shorter runtime. Topping up little and often, rather than draining to zero every time, is kinder to the cell. Because the battery is built in, when it eventually fades the whole device reaches the end of its life, which is the trade-off for the slim body.

Recycling in the UK. A vape with a built-in battery is electrical waste and must never go in household bins, where a crushed lithium battery can start fires in collection lorries and recycling plants. Retailers that sell vapes are required to take back old ones, and you can also use your local household waste recycling centre or a council WEEE drop-off point. Empty any remaining liquid from the pod first, wipe the device dry and hand over the device and used pods together.

Coil and pod technology

The pod is the part of the GK3 that does the work. Inside it, a heating coil sits against an absorbent wick and turns e-liquid into vapour whenever the battery fires. Because it is a closed pod system, the coil is built into the pod rather than being a separate replaceable head, so when the coil is spent you replace the whole pod. That keeps things clean and fuss-free: no coil screws, no priming heads and no tank to take apart.

Caliburn pods are designed with MTL resistances in mind, typically in the region of 0.8 to 1.2 ohms depending on the pod version. A higher-resistance coil gives a tighter, cooler draw with more throat hit per puff, while a lower-resistance coil gives a slightly warmer and fuller vapour. If the listing offers more than one pod resistance, a sensible rule is to match it to your nicotine strength. Higher-resistance pods make less vapour per draw and so deliver nicotine at a gentler pace, which suits stronger nicotine salts. Lower-resistance pods make more vapour per draw, which suits lower strengths such as 10mg/ml or below.

Compatibility needs care. Uwell has shared pod designs across several Caliburn models over the years, but not every pod fits every body, and a pod from an older model should not be assumed to fit the GK3. Always match the pod to the exact device name on the listing, and if you are unsure, ask us before ordering.

How long does a coil last? It depends on your liquid and your habits, but a typical pod gives somewhere between one and three weeks for a regular daily user. Things that shorten coil life include:

• Sweeteners and sugary liquids: sucralose and heavy dessert flavourings caramelise on the coil and gunk it up
• High VG liquids: thick liquids wick slowly and can leave the coil running partly dry
• Chain vaping: back-to-back draws do not give the wick time to resaturate
• Running the pod low: vaping on an almost empty pod is the quickest route to a burnt taste
• Skipping priming: firing a dry coil damages the cotton before it has had a chance to work

Signs a pod needs replacing are a burnt or flat taste even with fresh liquid, noticeably weaker vapour, or gurgling and leaking that does not clear. Do not try to extend a spent pod by adding more liquid, because the wick is already damaged. Fit a new one and the original performance returns.

Used pods contain a small coil and residual liquid, so treat them as electrical waste when you can. Drop them at the same recycling points as old devices rather than putting them in the general bin.

Choosing the right nicotine strength

Nicotine strength is the single biggest factor in whether a pod kit feels right or wrong, and getting it wrong is the most common reason new vapers give up. In the UK, e-liquid is capped at 20mg/ml of nicotine, which is the same ceiling that applied to disposables when they were still on sale, and bottles of refill liquid cannot exceed 10ml. Because the GK3 is an MTL device with a tight airflow, nicotine salts (nic salts) are generally the most comfortable fit, as they deliver nicotine smoothly without the harsh throat hit that freebase nicotine causes at higher strengths.

These are general starting points rather than medical advice:

• 20mg/ml: for people smoking around 15 or more cigarettes a day, or who want a strong cigarette-like hit
• 12mg/ml to 18mg/ml: for moderate smokers, roughly 10 to 15 a day, or those who find 20mg too sharp
• 10mg/ml: for lighter smokers, people who have been vaping for a while and want to step down, or anyone who plans to vape frequently throughout the day
• 5mg/ml or below: for those close to finishing with nicotine, or who vape large amounts of liquid

A useful principle is that you will vape more of a low-strength liquid and less of a high-strength one. If you are on 20mg and constantly sipping, you are probably getting more nicotine than you think. If you are on 10mg and still reaching for cigarettes, your strength may simply be too low for your needs.

Signs your strength is too high: dizziness, nausea, headaches, hiccups, a racing heart or an unpleasant scratch in the throat. If this happens, stop, drink some water and drop to a lower strength next time.

Signs it is too low: constant cravings, vaping far more often than you smoked, or going back to cigarettes in the evening. Move up a step and give it a few days.

If you are new to vaping, it is sensible to start at the strength closest to your smoking habit and adjust after a week, rather than guessing high. Avoid shortfill bottles that need nicotine shots added, because they are designed for sub-ohm tanks and are too thin on nicotine and too thick on VG for a pod like this.

If you want support to stop smoking altogether, the NHS stop smoking services in your area are free and can combine behavioural support with nicotine replacement or vaping. If you do not smoke, you do not need nicotine, and this product is not meant for you.

Who the Caliburn GK3 is for and who should skip it

The GK3 is a straightforward tool with a clear audience. Understanding where it fits helps you decide whether to buy it or look at something else.

It suits:

• Smokers switching to vaping: the MTL draw, tight airflow and nic salt compatibility give a familiar feel and a decent amount of throat hit
• Ex-disposable users: if you were using single-use devices before the ban, this is the nearest equivalent in size and simplicity, with the bonus of cheaper running costs and the freedom to pick your own flavours
• Vapers who dislike complexity: no buttons, menus or wattage to set, which suits people who just want to draw and go
• People who want a discreet device: small enough to disappear into a pocket or palm, and the vapour output is modest enough not to be conspicuous
• Anyone buying a back-up device: it is cheap and light enough to keep in a bag or desk drawer as a second kit

It is probably not for you if:

• You want big clouds: direct-to-lung vapers who like warm, dense vapour will find any MTL pod kit restrictive
• You want to adjust airflow and power: the GK3 keeps things fixed, so someone who likes tweaking should look at an adjustable kit
• You vape very heavily: a small pod and compact battery mean frequent refills and charges for chain vapers
• You use thick shortfill liquids: those need a sub-ohm device, not a tight MTL pod
• You have never smoked or vaped: nicotine is addictive, and there is no reason for a non-smoker to start

It is also worth being honest about age and legal requirements: you must be 18 or over to buy this kit, and retailers are required to check. Keep the device and any e-liquid out of reach of children and pets, as nicotine liquid is toxic if swallowed or if it gets on the skin in quantity.

If you are on the fence, think about your day. If you want something that goes in a pocket, works the moment you pick it up and does not need adjustment, the GK3 fits. If you tend to want control over every part of your vaping, the compact simplicity will start to feel like a limit within a week or two.

How to use the Uwell Caliburn GK3 Pod Kit

Setting up the GK3 takes only a few minutes, and doing it properly the first time prevents the majority of problems people run into. Follow these steps in order.

• Step 1, charge the device. Plug it in with the USB-C cable and give it a decent first charge before use. Do not leave it charging unattended.
• Step 2, fit the pod. Push the pod firmly into the top of the device until it sits fully home. If the pod is packaged separately, remove any protective film or plugs first.
• Step 3, fill the pod. Open the fill port plug, tilt the pod and run the liquid down the side of the fill hole rather than straight down the middle. Stop just below the maximum line. Overfilling is the most common cause of leaks and flooded coils.
• Step 4, close the fill port. Press the silicone plug fully back in so that it is flush with the pod.
• Step 5, prime the coil. Leave the filled pod standing upright for at least five to ten minutes so the cotton can soak up liquid. Skipping this step is the leading cause of burnt first puffs.
• Step 6, take a few test draws. Take a few gentle, low-power draws without inhaling to pull liquid through the wick. Then start vaping normally.
• Step 7, vape in MTL style. Draw slowly for two to three seconds, hold the vapour briefly in your mouth, then inhale and exhale.
• Step 8, top up before it runs out. Refill when the liquid is a third of the way full rather than waiting for it to empty, and prime again after each refill.

On first use, the device may switch on only when you draw, so do not worry if nothing seems to happen when you pick it up. If it supports any button-based lock or function, the user guide explains it, and it is worth reading that sheet once.

A few useful routines:

• Wipe the mouthpiece and the outside of the pod with a tissue every day to keep it hygienic
• Store the device upright when you can, particularly after refilling
• When changing flavours, empty the pod, wipe it and let it dry before refilling, or use a fresh pod
• Never leave liquid sitting in a pod for weeks while the device is unused, as it can leak or degrade the wick

When you are finished with the day, there is no need to switch anything off. Draw-activated devices stay idle until you pull on them, so there are no controls to remember at night.

Troubleshooting common problems

Most issues with small pod kits come down to a handful of causes, and almost all of them are fixable at home. Work through these before assuming something is faulty.

• No vapour or nothing happens when you draw: check the battery is charged and that the pod is fully seated. Remove the pod, wipe the contacts on both the pod and the body with a dry cotton bud, and refit it. If the pod is empty, refill and prime.
• Burnt or harsh taste: usually a dry or worn coil. Check the liquid level, give the pod ten minutes to soak, and take a couple of gentle draws. If the taste persists with fresh liquid, replace the pod.
• Weak or muted flavour: a coil that has reached the end of its life, a thick liquid or a low battery. Try a new pod with a thinner 50/50 liquid before blaming the device.
• Leaking from the pod: most commonly overfilling, an unseated fill plug, or a cracked pod. Reseat the plug, wipe the pod clean and refill to slightly below the max line. If the pod is cracked, replace it.
• Gurgling or spitting: too much condensation or liquid in the airflow path. Blow gently back through the mouthpiece to clear it, wipe up any excess, and take slower draws.
• Device will not charge: try a different cable and charger, check the port for lint, and make sure the connection is seated fully. A very flat battery can take a few minutes to show any indicator after being plugged in.
• Flashing light: the pattern can mean low battery, a short circuit or a missing pod. Check the user guide for the meaning of each pattern, then remove the pod, clean the contacts and try again.
• Device gets warm: slight warmth while charging or after heavy use is normal. If it becomes hot to touch, stop using it, unplug it and let it cool away from flammable items.
• Pod will not fit: make sure you are using a pod made for the Caliburn GK3 and not one from a different model.

If you have tried the checks above and the device still misbehaves, stop using it rather than forcing it. A pod that has been leaking into the contacts can be dried for a few hours and tried again, but a battery that swells, smells of chemicals or gets very hot should go to a recycling point immediately and be replaced.

For anything covered by the manufacturer warranty, such as a device that fails to charge or fire from new, get in touch with us promptly with your order number and a brief description of the fault. Photos or a short video can help us sort it out faster. Pods and liquids are consumables, so a pod that has simply reached the end of its life is a replacement rather than a warranty claim.

Value for money and running costs

The honest way to judge value on a refillable kit is to look at the total cost over a few months, not just the shelf price. A disposable looks cheap at the till but has to be bought again every few days, and it produces a lump of plastic, lithium and circuitry each time. A refillable kit asks for more upfront and much less afterwards.

The running costs of a GK3 break down into three items:

• The kit itself: a one-off purchase, with the current price shown on this page
• E-liquid: a 10ml bottle of nicotine salts typically costs in the region of a few pounds, and a bottle usually lasts a moderate vaper several days to a couple of weeks
• Replacement pods: sold in multipacks, typically replaced every one to three weeks depending on the liquid and your habits

For a moderate user, a month of e-liquid plus one or two pods usually comes to noticeably less than a month of cigarettes, and it typically compares well against the cost of the disposables the same person would have used in the same period. Exact figures depend on your vaping habits, so work it out for yourself: add up what you currently spend each week, then compare it with the cost of one bottle and one pod over the same period. Most people find the kit pays for itself within the first month or two.

Where the GK3 delivers value:

• You choose from thousands of liquids rather than a handful of preset flavours
• You can match nicotine strength to your needs and step it down over time
• The device lasts months, and only the pod is replaced regularly
• The pod ecosystem is mainstream, so refills and spares are easy to find
• Less waste: no throwaway plastic and battery every few days

Where it is less of a bargain:

• If you only vape occasionally, the upfront cost may outweigh any saving
• If you chain-vape, you will go through pods and liquid faster than the figures above suggest
• If you want a large or adjustable device, you are paying for a simple product that does not have those features

One more factor in the value equation is peace of mind. A kit from an established brand with readily available spares is a safer purchase than an unbranded device with no replacement pods, since the cheapest kit becomes the dearest the moment its pods stop being sold. Buy from a UK retailer that offers a returns route and clear warranty terms, and keep your receipt.

How it compares with other pod kits

No single pod kit suits everyone, and a fair comparison means being clear about what the GK3 does and does not do. Here is how it sits against popular alternatives, at a general level rather than a spec-by-spec duel, since details change between revisions.

• Uwell Caliburn G3: the larger sibling in the range. It generally offers a bigger battery and more output, which gives a fuller draw and longer runtime, but it is larger and more expensive. If you want a bit more power and do not mind the extra size, the G3 is worth a look. If you want the smallest and simplest option, the GK3 is the more pocketable pick.
• Vaporesso XROS series: a popular family of slim pod kits, with several models offering adjustable airflow and larger batteries than a basic compact kit. If you like to change the draw tightness, an XROS gives you more control than the GK3. The trade-off is slightly more bulk and more settings to understand.
• OXVA Xlim series: well regarded for its wide choice of pods and adjustable airflow on many models. A good pick for vapers who want to experiment, but the range is broader and can be more confusing to choose between.
• SMOK Novo series: a large and widely stocked ecosystem with plenty of pod options and colours. Comparable in size and purpose to the GK3, so the decision often comes down to which pod flavour feel and build you prefer.
• Single-use vapes: no longer sold in the UK since 1 June 2025. Any listing offering one should be treated with caution, whereas a refillable kit like the GK3 is the legal and more economical alternative.

In summary, the GK3 stands out for its simplicity and size. It does not offer adjustable airflow, a screen or a large battery, and if those matter to you, the alternatives above will serve you better. Where it competes well is on ease of use: fill, wait, draw, charge. For someone coming from smoking or from a disposable, that lack of complexity is a feature in its own right.

Whichever kit you pick, the most important choices are not the brand name. They are the nicotine strength, the e-liquid and whether the device suits how you actually vape. A well-matched liquid in a modest kit will outperform a premium device with the wrong strength every time. If you are unsure, ask us, and we will point you towards the option that fits your habits instead of the one with the longest feature list.