Vaporesso GT Core Coils (Pack of 3)

Overview

The Vaporesso GT Core Coils (Pack of 3) by Vaporesso in GT Ccell 2 0.3 at 0mg. Free UK delivery over £20, same-day dispatch on weekday orders before 4pm.

Vaporesso GT Core Coils (Pack of 3): what they are and what you get

The Vaporesso GT Core Coils (Pack of 3) are replacement coil heads for tanks and pod-style devices that use Vaporesso's GT Core coil platform. A coil head is the small, user-replaceable part that holds the heating element and the cotton wick. It is the component that actually turns e-liquid into vapour, and it is also the part of any refillable vape that wears out first. If your device has started to taste burnt, muted or flat even though the liquid is fresh, a new coil is almost always the fix.

This page is a long-form guide to the pack. It covers what the coil does, how it behaves in daily use, what to pair it with, how to fit and prime it properly, how to diagnose the usual problems, and how it compares with other coil platforms you might be weighing up. We have tried to keep the language plain and the claims honest, because coils are a consumable and nobody benefits from inflated promises about something you will replace every couple of weeks.

• What is in the pack: three GT Core coil heads, enough for roughly a month to six weeks of regular use depending on your liquid and power settings.
• What it is for: refilling the performance of a compatible refillable tank or pod, so you are not throwing away an entire device when only the coil has aged.
• What it is not: a standalone vape. You need a compatible Vaporesso device or tank, a battery or mod, and e-liquid.

Because this product sits in a family with two options, you will see a selector on the page. Variants of the same coil platform almost always differ by resistance and by the wattage window printed on the coil, so the number you choose should line up with the power range of your device and the way you like to vape. We explain how to choose between them further down.

One point worth stating early: always confirm compatibility with your specific tank or kit before ordering. Coil platforms are tied to particular tank bases, and a coil that looks similar but belongs to a different series will not seat or seal correctly. If you are unsure, check the markings on the coil you are replacing, read the compatibility note on your device's page, or message us with the device name and we will point you to the right pack.

Finally, a note on who this is for. Vaping is for adults who smoke or used to smoke and want an alternative. It is not intended for non-smokers or anyone under 18, and you must be 18 or over to buy from us. Replacement coils are a sensible, lower-waste way to keep an existing device running, which fits the direction UK rules have been moving in since single-use vapes were banned.

Performance and vapour delivery

Performance on a coil head comes down to three things: how quickly the wick can refill the heating element, how evenly the element heats, and how well the coil matches the power you feed it. When those three line up, you get consistent vapour from the first puff to the last, with no sudden dry hits and no spluttering. GT Core coils are designed around that balance, and in normal use they deliver steady, predictable output across their intended wattage window.

In practical terms, here is what to expect from a fresh coil that has been primed correctly:

• Fast ramp-up. A well-made coil head reaches working temperature within a fraction of a second of pressing the button or drawing, so the first inhale is not thin or delayed.
• Consistent vapour density. Within the recommended wattage range, vapour should build smoothly rather than jumping from weak to harsh when you add a few watts.
• Stable wicking. The cotton should keep pace with chain vaping, provided you are using a liquid with a suitable thickness and you are not running the device at the very top of its power limit.

The resistance of the coil sets the character of the draw. Lower resistance coils pass more current, run at higher wattage and produce larger, warmer clouds. They usually suit a looser, lung-style inhale. Higher resistance coils run at lower wattage, use less liquid and battery, and give a tighter, more cigarette-like draw that many ex-smokers find easier to move across to. Neither is better in the abstract; it depends on whether you want volume or economy.

Output also depends on your airflow setting. Opening the airflow ring cools the vapour and increases volume, while closing it down concentrates flavour and warmth. Most people settle on a middle position after a day or two. If you ever find that the vapour feels hot and harsh, that is the cue to open the airflow slightly or reduce power rather than a sign that the coil is faulty.

Expect a settling-in period. The first few puffs after installing any new coil are rarely the best, because the cotton is still bedding in and absorbing liquid. By the end of the first tank, the coil should be performing as intended. We would rather tell you that plainly than promise perfect output from the very first draw.

Flavour profile and how the coil shapes taste

A coil does not add flavour of its own, but it has a large influence on how the flavour of your e-liquid is delivered. Heat, surface area, and wick quality all change what reaches your tongue. A coil that heats the liquid too aggressively can flatten delicate notes and exaggerate sweetness, while a coil that runs cooler tends to preserve the separation between, say, a fruit top note and a menthol finish.

With GT Core coils, the general pattern is a balanced, clean presentation that lets the liquid speak for itself. That makes them a reasonable all-rounder: fruit, dessert, tobacco, menthol and cola profiles all translate well, as long as the power is set inside the recommended window. If you push the wattage too high, the common outcome is a slightly scorched or sharp edge, and that is a setting issue rather than a coil defect.

• Fruit and ice liquids: usually come through crisp. Menthol-heavy liquids can feel cooler on a lower-resistance coil because the extra vapour carries more of the cooling agent.
• Desserts and custards: these contain more sweeteners and heavier flavour compounds, which tend to leave residue on the coil faster. Expect a slightly shorter coil life and consider dropping the power a little to keep the flavour clean.
• Tobacco and drinks profiles: subtle top notes show best at moderate wattage, where the coil is not overpowering them with heat.

It helps to think of coil flavour in terms of ageing. A fresh coil tastes at its cleanest. As the days go by, sugar and other residues caramelise on the heating element and wick, gradually dulling the taste. That change is gradual and easy to miss, which is why many vapers only notice how muted their device had become once they fit a fresh coil and the difference is obvious.

If you are changing liquid flavour often, give the new coil a few puffs before judging. Cotton holds a little of the previous liquid, and swapping from a heavy dessert to a light mint can leave a ghost of the old flavour on a coil that has already been in use for a week. In that situation a fresh coil is the clean slate. For this reason, some people keep a separate tank and coil for menthol and another for sweet flavours; with a pack of three, you can rotate coils to match.

Design and build quality

Coil heads look simple from outside, but a lot of engineering sits inside a package smaller than a thumbnail. The visible part is a metal housing with a base fitted with a gasket or sealing ring and an electrical contact at the bottom. Inside sit the heating element, the cotton wick and the liquid inlet ports that let e-liquid flow from the tank to the cotton. GT Core coils follow this familiar layout, and the build is consistent across the three coils in the pack.

Things worth checking when you open the pack:

• Housing finish. The metal shell should be clean with no dents or burrs. Minor surface marks from manufacture are normal, but a crushed or bent housing is not.
• Sealing ring. The silicone or rubber ring at the base should be intact and seated evenly. This ring is what stops liquid leaking into the airflow chamber, so it matters more than it looks.
• Inlet ports. The small slots on the side of the coil should be open and free from debris. Do not poke anything into them.
• Contact. The bottom contact should be clean and bright. If the contact is greasy or dirty, wipe it with a dry lint-free cloth before fitting.

Vaporesso is an established manufacturer with a long history of closed-pod and open-tank products, and its coil platforms are made to tolerances that suit its own tanks. That is a genuine advantage of buying a manufacturer's own coils over third-party alternatives: the base dimensions, the gasket fit and the contact height are all matched to the tank, which reduces the risk of leaks and poor connection.

It is fair to say that coil build quality is not a place to expect dramatic differences you can see by eye. The differences show up in use: how well the wick is packed, how consistent the resistance is from one coil to the next, and how reliably the seal holds. Over many users, the usual measure is consistency. Within a pack of three, you should see the three coils behave very similarly. If one coil performs noticeably worse than the other two from fresh, that is worth reporting to us, because it points to a fault in that individual coil and not to your settings.

Store the spare coils in their original packaging in a cool, dry place, away from direct sunlight and heat. Do not remove the protective wrapping until you are ready to fit one.

Battery, power and charging considerations

A coil head has no battery of its own, so charging is about the device you pair it with. That said, the coil you choose has a direct effect on battery life, and it is worth understanding the relationship before you buy. Battery drain is roughly proportional to the wattage you vape at, and the resistance of the coil sets the wattage window. A lower resistance coil will usually ask for more power and drain the battery faster. A higher resistance coil will run at lower power and stretch each charge further.

• Lower resistance (higher wattage): bigger clouds and warmer vapour, with shorter battery life per charge and more e-liquid used per day.
• Higher resistance (lower wattage): tighter draw, lower liquid consumption and noticeably longer battery life.

As a rough illustration only, a device with a built-in battery in the 1,000 to 3,000mAh range will often last through a normal day at moderate wattage, but may need a mid-day top-up if you vape heavily at the top of the range. Your own figures will differ with device, coil and habit, so treat this as a rule of thumb, not a specification.

Charging safety matters and is often overlooked. Follow these basics with whichever Vaporesso device you use:

• Use the cable supplied with the device, or a reputable USB cable from a recognised brand.
• Charge on a hard, non-flammable surface, never on a bed, sofa or under a pillow.
• Do not leave a device charging unattended overnight if you can avoid it.
• If the device becomes hot while charging, unplug it and let it cool.
• Stop using any device with a swollen, damaged or leaking battery, and recycle it responsibly.

Fitting a new coil can sometimes cause a device to show a 'check atomizer' or 'no coil' message. This is not a battery problem. It usually means the coil is not seated fully or the contact needs wiping. We cover that in the troubleshooting section below.

Finally, keep your power inside the wattage range printed on the coil. Running a coil above its recommended range does not make it perform better; it makes the cotton burn sooner, shortens the life of the coil and tends to produce a harsh, unpleasant taste. If you want more output, a lower resistance coil is a better route than turning up the power on a coil not designed for it.

Coil and wick technology explained

Understanding what is inside a coil helps you use it better and spot problems earlier. A typical refillable coil head contains three key elements: the heating element, the wick, and the housing that connects them to the tank.

• The heating element. This is a resistance wire or mesh that heats when current passes through it. Coil designs vary: round wire wrapped around cotton, flat ribbon, or a mesh sheet that gives a larger heated surface area. The more surface area in contact with the wick, the more evenly liquid is vaporised.
• The wick. Usually organic cotton, sometimes with additional layers or treated fibres. It soaks up e-liquid from the tank through the inlet ports and delivers it to the heating element. If the wick is too dry, you get a dry hit; if it is flooded, you get gurgling and leaks.
• The housing. The metal shell that holds everything together and channels airflow over the heating element before it reaches your mouth.

Where the heating element sits in relation to the airflow is one of the main design choices. Some coils pull air across the element from the side, others from underneath, and some direct it through the middle. These choices affect how the vapour cools, how flavour develops and how likely a coil is to leak. In general, you do not need to dig into the design of a particular platform; the key is to match the coil to the tank it was designed for.

Sub-ohm versus higher resistance is the other major axis. A coil below 1.0 ohm is conventionally called sub-ohm, designed for larger vapour volume. Coils above 1.0 ohm are intended for tighter, mouth-to-lung draw. Variants within a coil family often include one of each type or two points within the same band. Check the number printed on the coil body and the tank listing to see where each variant falls.

Priming is important. Before the first puff, the cotton must be fully soaked with e-liquid. Dry cotton burns instantly, and a burnt coil cannot be recovered. This is why every instruction sheet insists on a five to ten minute rest after fitting and filling. It looks like a small detail, but it determines whether a coil lasts three weeks or three hours.

Coils also age in a predictable way. Over time, residue from sweeteners and flavouring builds up on the element and in the cotton pores. That residue insulates the wire, slows the wicking and eventually produces the familiar burnt taste. Better wicking and lower power slow this process, but they do not stop it. That is why coils are classified as consumables.

Choosing nicotine strength and e-liquid for these coils

The coil resistance and the nicotine strength of your liquid need to work together. This is the section where people most often go wrong, usually by pairing a high-strength liquid with a low-resistance coil designed for large volumes of vapour.

In the UK, nicotine-containing e-liquid is legally capped at 20mg/ml (2%), bottles are limited to 10ml, and refillable tanks are limited to 2ml of capacity in UK-compliant editions. These limits apply to all e-liquids sold here, whichever device you use. The disposable vape market was also removed in June 2025, when the sale of single-use vapes became illegal in Great Britain. Reusable devices with replaceable coils, like those that use GT Core heads, are the long-term route for adult vapers who want to keep vaping.

Here is a simple way to match liquid and coil:

• Higher resistance coil (mouth-to-lung style, lower wattage): nicotine salt liquids at 10mg/ml to 20mg/ml are the usual choice. The higher strength is smooth at low power and satisfies cravings with small amounts of vapour.
• Lower resistance coil (sub-ohm style, higher wattage): freebase nicotine at 3mg/ml to 6mg/ml, in a higher VG shortfill-style or 50/50 blend, is the typical choice. Because each puff delivers a lot more vapour, a lower strength is needed to avoid a harsh throat hit.

Avoid pairing 20mg/ml nicotine salt with a low-resistance high-wattage coil. The result is usually a very strong, unpleasant throat hit, rapid nicotine intake and wasted liquid. If you find yourself with a high-strength liquid and a low-resistance coil, the answer is to change the liquid or the coil, not to tolerate it.

Liquid thickness (the VG to PG ratio) matters too. Thick, high-VG liquids flow slowly through the inlet ports and can starve a coil at high power. A 50/50 or 60/40 VG/PG blend is the safe middle ground for most coil heads. Very thin, high-PG liquids can leak more easily. If you notice gurgling or leaking, check the liquid thickness alongside the coil.

Nicotine is addictive. If you are new to vaping, start at the lowest strength that stops you reaching for cigarettes, and aim to reduce over time if you wish. If you are pregnant, have a heart condition or take medication, speak to your GP or a stop-smoking service before using nicotine products. Free local stop-smoking support is available through the NHS.

Who these coils suit, and who should look elsewhere

Replacement coils are one of the most practical purchases a vaper makes. They do not offer anything glamorous, but they keep an existing device performing as it did on day one. Whether the GT Core pack is the right one for you depends on three questions: do you own a compatible device, do you want to keep it, and does the variant suit your vaping style?

These coils are a good fit if you:

• Already own a Vaporesso tank or kit that takes GT Core heads and want a straightforward like-for-like replacement.
• Prefer buying multi-packs so you always have a spare coil on hand and do not run out in the middle of the week.
• Want to avoid the cost and waste of replacing an entire device when only the coil has worn out.
• Like the idea of choosing between two variants, so you can pick the resistance that matches your device and preferred draw.

You might want to look elsewhere if you:

• Do not own a compatible device. A coil on its own does nothing, and the wrong platform will not fit.
• Use a closed pod system with pre-filled pods. Those use their own pods and do not take loose coil heads.
• Want a rebuildable setup where you wrap your own wire and cotton. Pre-made coils are the opposite approach.
• Are not a current or former smoker. Vaping is not recommended for people who do not already smoke.

Within the family, the choice of variant is mostly about draw. If you are moving across from cigarettes and like a tight, controlled inhale, aim for the higher resistance option and a nicotine salt liquid. If you came from a bigger device and enjoy a looser, warmer lung inhale with larger clouds, choose the lower resistance option and a lower strength freebase liquid. If you are undecided, buy the variant that sits closest to the middle of your device's wattage range, because that gives you room to adjust either way.

Beginners sometimes worry about the choice. The reassuring news is that the consequences of choosing slightly wrong are small. A coil that is a little higher or lower in resistance than ideal still works; it just changes the feel. You can switch to the other variant with your next pack.

How to fit, prime and use your GT Core coils

Fitting a coil takes about two minutes, but the steps matter. Skipping the priming stage is the number one reason coils fail early. Follow this process for every new coil, and consult your tank's manual for any model-specific details.

• Step 1: Power down and empty. Turn off the device or lock the button. Remove the tank from the battery section and, if there is liquid in it, empty it or ensure the fill port is closed.
• Step 2: Remove the old coil. Unscrew or pull out the old coil head according to your tank design. Keep track of the sealing ring so it does not get lost.
• Step 3: Prime the new coil. Apply a few drops of e-liquid directly onto the cotton through the inlet ports on the side of the coil. Do not drip into the central airflow channel.
• Step 4: Fit the coil. Push or screw the coil firmly into the base until it seats fully. A half-seated coil is a common cause of leaks.
• Step 5: Fill and wait. Fill the tank to just below the maximum line and let it sit upright for five to ten minutes. This lets the cotton absorb liquid fully.
• Step 6: Start low. Begin at the lower end of the recommended wattage range. Take a few gentle puffs without pressing the button, then use short pulls to bring the coil up to working temperature.

For the first tank, stay at the lower to middle part of the power range. Once the coil has bedded in, you can increase wattage a little if you want more output, but staying inside the printed range always gives the best life.

Everyday habits that make coils last longer:

• Keep the tank at least a quarter full. A tank that is nearly empty can leave the wick exposed.
• Take pauses between puffs when chain vaping. This gives the cotton time to refill.
• Avoid vaping heavily sweetened liquids at maximum power.
• Do not dry burn a coil in an attempt to clean it. It damages the wick and shortens life.
• Replace the coil at the first sign of a persistent burnt taste.

Disposal and recycling. Used coils contain small amounts of metal and cotton and sometimes residual nicotine. Do not put them in general household waste if you can avoid it. Many vape retailers and local authority recycling centres in the UK accept used vape equipment through WEEE drop-off points, and under UK rules retailers selling electrical items are expected to offer take-back. Check your local council's website or the Recycle Your Electricals site for the nearest drop-off point. Never put batteries or devices in kerbside recycling.

Troubleshooting common coil problems

Most coil problems have simple causes. Work down the symptoms, starting with the simplest fix, before you assume the coil is faulty.

• Burnt or acrid taste. Almost always caused by an under-primed coil, a nearly empty tank, power set too high or a coil at the end of its life. Check the liquid level, drop the wattage and take shorter puffs. If the taste persists after you have refilled and reprimed, the coil is spent. Replace it.
• Leaking from the base or airflow. Usually a poorly seated coil, a damaged sealing ring, overfilling the tank, or a liquid that is too thin. Re-seat the coil, check the ring, and fill to below the max line. Wipe condensation from the airflow slots.
• Gurgling or spitting. Excess liquid in the airflow chamber. Tilt the tank gently while drawing without firing, then wipe the chimney. Do not over-prime. Lower the power slightly.
• Weak vapour or muted flavour. A sign of a coil that has aged, a clogged wick or an airflow setting that is too open. Try closing the airflow slightly and check whether a fresh coil restores the flavour.
• 'No atomizer' or 'check coil' message. Clean the bottom contact and the connection inside the tank base with a dry cotton bud. Make sure the tank is screwed in all the way and that the coil is seated.
• Dry hits. Occur when the cotton runs short of liquid. The cause is often a very thick liquid, chain vaping at too high a power, or a tank that is almost empty. Let the coil rest, refill and reduce power.
• Coil life much shorter than expected. Check your wattage range, the sweetness of your liquid and how often you chain vape. Sweet dessert liquids can shorten coil life to a week or less.

A useful diagnostic is to swap in a different coil from the pack. If the second coil performs normally under the same settings and liquid, the first one was probably defective or damaged. If the same symptom reappears, the cause is the tank, the settings or the liquid.

If you have followed these steps and believe you have received a faulty coil, contact us with your order number and a short description of the problem, including the device, wattage and liquid you were using. Photographs of the coil and sealing ring help us identify problems quickly.

Never attempt to open or modify a coil head, and never use a device with exposed wiring or a visibly damaged tank base. Safety comes before squeezing out a bit more life from a coil.

Value for money, and what to check before you order

Value in coils is not only about the price on the box. It is about how long each coil lasts, how it affects your liquid use, and how it compares with the alternative of replacing a whole device. A pack of three is the more economical way to buy than single coils, and a better habit than waiting until the last coil is spent.

Here is a straightforward way to think about the numbers:

• Cost per coil: divide the pack price by three. Multi-packs almost always work out cheaper per coil than single replacements.
• Lifespan per coil: typically one to three weeks, depending on your liquid, your power and how much you vape. Heavy users of sweet liquids will be at the shorter end; light users of simple fruit or tobacco profiles can reach the longer end.
• Cost per week: pack price divided by the total weeks of coil life. A pack that gives roughly three to six weeks of use works out to a modest weekly cost, and often less than a few packs of cigarettes a month.

Compared with the rest of vaping costs, coils are not the biggest line. E-liquid usually costs more over a month, especially on lower-resistance setups that use more liquid. This is one reason to consider your resistance choice carefully. A higher resistance variant at lower wattage uses less liquid and less battery, so even though the coil price is similar, the total running cost is lower.

Compared with the disposables that used to dominate the market, a reusable device with replaceable coils is generally the cheaper route per puff, and it produces less electronic waste. With single-use vapes now banned in Great Britain, this is also the legal and practical choice. The upfront cost of a device is spread across many months, and the ongoing cost is mostly coils and liquid.

Where do you get the best return? Three habits help:

• Buy a spare pack before you need it, so you never end up vaping on a spent coil because you ran out.
• Keep wattage within the printed range and prime every coil properly.
• Match nicotine strength to coil resistance, so you are not using more liquid than you need.

It is worth saying that coils from the original manufacturer cost a little more than unbranded alternatives. The trade-off is fit, consistency and the confidence that the sealing ring and contact height match your tank. For most people, the small premium is worth paying to avoid leaks and unreliable connections. Cheap lookalike coils sometimes save a pound or two but can cost you liquid and frustration.

Before you add the pack to your basket, run through a short checklist. It takes a minute and avoids most of the problems customers contact us about.

• Confirm your device. Check the make and model of your tank or kit and confirm that it uses GT Core coil heads. If you are replacing a coil, the markings on the old one will usually tell you.
• Pick the variant. Choose the resistance that matches your wattage range and your preferred draw, using the guidance in the sections above.
• Match your liquid. If you currently use 20mg/ml nicotine salt and plan to move to a lower resistance coil, consider a lower strength to keep the throat hit comfortable.
• Check quantity. One pack of three covers several weeks. If you vape heavily, add a second pack so you are covered for longer.

We sell to adults aged 18 and over only. Age verification may be carried out at checkout or on delivery, and we cannot release parcels to anyone who cannot demonstrate they are of legal age. Coils themselves do not contain nicotine, but they are sold as vaping products and are subject to the same age restrictions.

Delivery is within the UK. Dispatch times and carrier options are shown at checkout. Orders are packed discreetly. If an order is delayed, get in touch and we will track it for you.

Returns and faults: coils are a hygiene-sensitive consumable, so opened or fitted coils generally cannot be returned for change of mind. Unopened packs in original condition and genuinely faulty or damaged-on-arrival items are handled according to our returns policy, so please read that page for the current terms and timescales. If you think your coil is defective, contact us promptly with your order number and details.

A final word on sensible use. Replacement coils help keep a reusable device running and reduce waste, but vaping is not risk-free and is intended as an alternative for adult smokers. If you are using vaping to quit smoking, free NHS stop-smoking support can improve your chances, and your local pharmacy or GP can point you to it. When your coils are spent, recycle them through a WEEE drop-off point instead of binning them.

How GT Core coils compare with other coil platforms

Most vapers end up comparing coil platforms at some point, either because they are choosing a new device or because they are tempted by a cheaper pack. Here is a fair comparison with the other platforms you are likely to meet. Every comparison is general, since the details vary between individual coil models, and you should always compare the specific resistance and wattage figures on the packs you are considering.

• Versus Vaporesso's own GTX and GTi families: these are sibling platforms from the same manufacturer, with different bases and mesh designs. They are not interchangeable with GT Core heads. If your tank calls for GTX or GTi coils, do not buy GT Core by mistake.
• Versus SMOK coil families: SMOK has a wide range of coils for its own tanks and kits. They are generally well supported in the UK, and prices are in a similar range. The deciding factor is almost always which tank you own, not which coil is better in the abstract.
• Versus Uwell Caliburn-style pod coils: these are designed for pod systems with lower wattage and mouth-to-lung draw. They typically suit nicotine salts and tighter draws, so they are closer to the higher resistance variant in this family than the lower resistance one.
• Versus GeekVape coil families: GeekVape coils tend to be designed around mesh elements with a loose lung-style draw, with a similar life expectancy. Again, compatibility with your tank decides.
• Versus VooPoo PnP coils: a widely used platform on VooPoo devices and some compatible tanks, with a broad range of resistances. Many users appreciate the variety; the trade-off is that you must check which PnP coil fits which tank.
• Versus third-party or generic replacement coils: cheaper, but quality can vary, and fit and sealing are less predictable. For occasional use they can be acceptable; for daily use, genuine coils tend to give fewer leaks.

The honest summary is that no coil platform is clearly ahead of the rest across the board. Each one is designed to work with its own tank, and each has strengths and trade-offs. What matters is that the coil matches your device, that its resistance suits your style of vaping, and that its price is reasonable for the life you get from it.

If you already use a Vaporesso tank that takes GT Core heads, staying with the same platform is the simplest path, with no compatibility guesswork. If you are choosing a device from scratch, look at the coil ecosystem as part of the decision: how widely the coils are stocked, how many resistance options exist, and how much a replacement pack costs. A cheap device with expensive or hard-to-find coils is a poor long-term deal.