Beginners Guide To Sub Ohm VapingThere’s No Place Like Sub-Ohm

An increasing number of sub-ohm tank options are coming to the clearomizer market.

Here, we present a guide to what this means and how you can safely use them.

What Is An Ohm?

Just as electrical current is measured in amps or length measured in meters, the measure of resistance of a coil is in ohms, sometimes seen as the symbol Ω.

Most standard replacement heads for mouth to lung (MTL) vape tanks/clearomizers are between 1.2Ω to 2.0Ω.

The term ‘sub-ohm’ is used when the resistance of a coil measures less than 1 ohm.

The highly popular Aspire Cleito and Innokin iSub G tank offer the option to use a 0.2-0.5Ω replacement head.

Aspire Cleito ReviewInnokin iSub V tank

What Difference Does A Sub-ohm Coil Make?

As the resistance of a coil gets less it allows more electrical current to flow.

Higher current means more energy is getting to the coil, faster. This results in a coil heating up quicker and reaching a higher temperature.

Hotter coils lead to an increase in liquid being vaporized which, when combined with an increased airflow, increases the cloud produced and the flavor.

Mouth to lung or lung inhale?

One issue you might have with a Sub-Ohm tank is that a lot of them require you to make direct to lung (DTL) inhales.

Learn More: Check out our MTL vs DTL guide for more information.

It is strange initially to get used to since when we smoked we all did mouth to lung inhales.

You do get used to it but if you are the kind of person that doesn’t want to inhale hard on a tank then it may not be for you.

There are Sub-Ohm tanks that let you do both so you can choose your own preference.

One such example is the Aspire Triton.

So, I Need A Sub-ohm Tank Then?

No. Most people spend their entire time vaping quite happily in the 1.2-2.0Ω regions with the likes of the Aspire Nautilus 2 and Innokin Endura.

If you are happy with what you have then there’s little reason to change – but you may wish to explore this type of vaping all the same.

Others seek more ‘hit’ from their vape and an increase in the volume of vapor will lead to an increase in nicotine per puff.

Reducing Your Nicotine For Sub Ohm Vaping

If you have been using mouth to lung vape tanks or e cigarettes then you are likely using a higher nicotine content in your e liquid. This could be anywhere from 11mg-24mg.

When sub ohm vaping it’s recommended to reduce the percentage of nicotine that’s in your e juice.

This is for the simple fact that sub ohm vaping provides a bigger ‘hit’ when you vape. If you vape 18mg juice MTL then using this for sub ohm vaping will likely be too strong.

For most, sub ohm vaping with high nicotine will be near on unbearable!

I personally vape at 12mg mouth to lung but when sub ohm vaping I reduce my nicotine to 3mg and on occasion 6mg.

So please, just keep this in mind.

If that is what you are looking for then you can also see what our top choices for sub ohm tank are.

Do I Need A Special Device To Use A Sub-Ohm Atomizer On?

Yes, absolutely.

There are a number of different devices. Mainly falling into the following categories:

Mods that have integrated batteries recharge by plugging in a USB cable. Whichever you decide on you need specific cells that can cope with the current a low-ohm coil allows to flow.

One very important thing we will say is if you are going for a mechanical mod you need to have a sound knowledge of battery safety. Mech Mods are NOT regulated and can be very dangerous if used incorrectly.

With that in mind, if you are new to vaping we recommend sticking to the regulated variety.

Most entry level Vape pens (also known as EGO e cigs) will not be able to handle the stress and older box mods such as the Eleaf 20W and the MVP 2 will just refuse to fire up.

These do not work with coils under 1.0 Ohms. Just be sure to double check what resistance coils the sub ohm tank you go for comes with.

High current can damage battery cells and lead to accidents. It is important to use the correct battery or device.

What Batteries or Mods Can I Use With a Subtank, Cleito or Similar Sub Ohm Tank?

There are simply too many devices on the market now to list them all, but here are some things for you to think about:

Regulated devices (adjustable power)

The first consideration will depend on which size of atomizer you are using. Some people like a flush fitting appearance; others are not too bothered with the atomizer overhanging the mod. The size is usually referred to as diameter with most tanks sitting around 22-23mm.

Many regulated devices will list the lowest ohms they can power – if it doesn’t list it on the mod specification the safest solution is not to use it until you have confirmation it’s safe from the vendor or manufacturer.

All of the main e cig manufacturers produce sub ohm mods. Brands such as Aspire, Innokin, Kangertech and Jacvapour (to name a small selection) are all trusted suppliers that continually produce high quality products. Beginners Guide To Sub Ohm Vaping

Mods using genuine DNA30, DNA40 and SX350 chips in the circuit boards will all be able to handle the demands the atomizers place on them.

Check out our guide and recommended DNA Mods here.

Click The Image Below For Recommended, Regulated Devices That Are Sub Ohm Capable:Best Vape and box Mods for 2017

Again, some of the above will only be compatible with 0.5Ohm resistance coils, some will be compatible with resistances down to 0.2 Ohms, some maybe lower.

Just be sure to check the mod and the tank, if buying separately, are compatible.

Mechanical Mods

When using these atomizers on mechanical mods the warning is: do not use cheap or counterfeit cells. The other warning is, know 100% what you are doing!

Most Ebay vendors do not purchase their cells directly from companies and there are many clones about. Avoid all cells that have the word ‘fire’ in the name.

It is worth looking at this video about fake cells on Ebay.

The most common cells used by vapers are the purple range with an Efest label. These cells balance affordability with performance and can perform at 0.5Ω.

Sub Ohm Vaping Guide For Beginners

The universal rule with batteries is: You get what you pay for. We have a separate guide on batteries for sub ohm vaping here

Sub-Ohm Tanks and Temperature Control

One great advantage of Sub-Ohm tanks is that some of them can be fitted with Nickel (Ni200), Titanium (Ti) and some with Stainless Steel coils designed for use with Temperature Control devices.

For many people who really don’t want to mess around making Nickel coils for their RDA’s and RTA’s this makes things extremely convenient.

In my experience so far I have to say that the right Sub-Ohm tank with a Nickel coil gives an absolutely cracking vape but again this isn’t for everyone.

Find out more with our Temperature Control vaping guide.

Possible Drawbacks

So, you are all fired up and want to take your vaping to another level. But, to do it as safely as possible you need to be aware of the following:

If your wick is not wicking juice fast enough it will dry out quickly due to the low ohms, it is vital that a wick remains moist to avoid dry hits.

This is especially important if you begin to build your own coils and wicks in something like a SMOK TFV8, RDA, or other rebuildable tank atomizer.

Dry hits not only taste unpleasant but Dr. Konstantinos Farsalinos is currently carrying out a research study investigating what toxins are produced by coils at elevated temperatures.

Lower ohms leads to a faster current running through the circuit, this will run your battery cell down faster – an important consideration if you are wanting an all-day vape for work or leisure.

Further Help

The growth in the number of online e cig forums and social media groups means that there is always someone out there who knows the answer to your question and is happy to share – us vapers are kind like that.

Happy vaping ☺



  1. Hello..
    I’m new to sub-ohm vaping (vaping is new to me actually).. There are some concern.. I’m using serpent mini rta tanks with average 0.7ohms.. With ipvs4 mod..
    The prob i’m having is my cotton burned quite often and i got this burn sensation which i hate..
    I also have this popping and spitting prob.. Looking forward for some advice.. My setting most of the time for 0.7ohms is 19-21W.. 70vg/30pg juice..


    • Hey Khai,

      So you’ve jumped straight into rebuildables! While there is nothing wrong with that these type of devices are generally classed as more advanced.

      The thing with rebuilable devices such as these is that there are different ways of wicking to get the best results and to get the best from a device.

      For your device specifically I would recommend checking out some of the reviews on YouTube here to see how they set things up

      Burning cotton can be down to a number of things:

      Not letting the cotton soak up juice for long enough before vaping.
      Chain vaping – (Again, not giving the juice enough time to soak through the cotton between vapes)

      Once a cotton is burnt it can’t be saved. The burnt taste can also carry over to the juice you have left in the tank, so this may also need to be emptied and replaced.

      Check out this guide for some help on spitting/burning problems. It’s mainly for standard tanks but some may apply to RTA use.


  2. Hey there! I just got a Sigelei Swallowtail and am using 0.5 ohm coil. I’m having a hard time finding my “sweet spot,” I don’t know what all the settings do lol. I had a kangertech before, 0.5 ohm and normally on like 20 W. but when I do 20 W in this one it shows the ohm as over 0.5. Help! I don’t know where to even start lol. Thanks!

    • Hey Chelsea!

      haha… We’ve all been there!

      The Swallow Tail looks beautiful by the way! Good choice.

      The ohm readings from coils can have a little variance so unless they are well out then don’t worry about that too much.

      You don’t need to worry about all the different settings. The only one you need to use at the moment to get you up and running is the wattage functionality.

      The best thing to do to find your sweet spot is to simply work your way up the wattage on the mod, 0.5 or 1W at a time. I normally start low and work my way up a little at a time.

      It does happen where different mods may need a little more/less wattage so don’t worry if the wattage is higher than what you’re used to.

      It’s just about finding the right spot for you.

      Have a go Chelsea and let me know how you get on.



  3. Hi. I have king baby i put tfv12 x4 coil and attached the atomizer on therion 166 and cks icon 200 both gives me .32 ohms instead of .16 labeled on the coil. Is that OK. Help me to understand . thanks

    • Hi Ahmed,

      There can sometimes be a slight difference on the resistance reading and what it says ‘on the tin’ so to speak. The difference shouldn’t be anything to worry about with that particular coil.

      Resistances can also change somewhat when the coil is heated.

      Have you tried any other coils? Do they read closer to the rated ohms?

      Also, be worth cleaning the connections fully on the tank and mod.

  4. Hi Johnny,

    Newbie here. I’m planning to get a sigelei 213 plus and a uwell crown 3/ uwell rafale or kanger protank 4. Which tank do you suggest for better coil life and budget. I’m currently using a predator 228 with the elabo tank.


    • Hi Hunais,

      The Uwell Crown 3 is the latest of the tanks and while we have this in the queue for review it is looking as if it’s a very good tank. So, out of the three you have mentioned I would personally go for this.



  5. Hello Johnny i just bought a new eleaf pico mini with melo 3 this is my first box mod. There are 2 coils 0.3 and 0.5 i found in my box now im using 0.3coil watt mode 30w with sony 1-vtc5 battery because of coil labelled use between 30-80w for example can i use my mod 20w? Or can i go high +50w to find my sweetspot thanks

    • Hey Serdar,

      Yeah for sure you can go to any wattage you want.

      As always with any tank/coil/mod combo I recommend starting low (20W if you want) and work your way up until you find your sweet spot.

      This may change depending on the type of juice and flavour you are using so you may need to have a play with the wattage settings for each new flavour.

      Any other question you have on this or anything else please let me know!



  6. Hi Jonny, I would really be grateful for some advice please. I am very stuck and confused. I want to stop smoking and start vaping properly but I just don’t know what to buy. I have been using e-cigarette’s but there is not enough vapour or nicotine throat hit. I have bought a pen which I didn’t like and then x2 sub-ohm’s, which I have found too harsh on my throat and chest and if I turn them down I don’t get any vapour!! I would like vapour and nicotine. Please can you help me, I’ve done research and can’t find any more information to help and don’t want to keep spending money for nothing!! Thank you so much.

    • Hi Samantha,

      Thanks for getting in touch! I’ll try and help where I can, of course if you want any clarification on any of the below please ask.

      What e-liquid (nicotine strength and PG/VG ratio) are you using?

      Just a quick note, the reason your sub ohm vape will be too harsh will be due to one or both of the following:
      Nicotine % too high – Higher nicotine helps with a stronger throat hit, especially so with sub ohm coils. Sub ohm coils require a lower nicotine content than a standard vape pen style device as the coils are powered by more heat. You will still get a good nicotine hit though. Recommended nic level 3mg/6mg.
      PG % too high. PG can be a touch harsher on the throat as well, especially with sub ohm coils. Same reason above. It is recommended to use a higher VG% e liquid which provides a smoother vape. Say 60VG/40PG juice as an example.

      So, with the above in mind, you may not need to buy a new device. If I were you I would just try a lower nicotine strength or possibly a combination of lower nicotine and higher VG. Try the former first, could save you a lot of money.

      I know it sounds counter intuitive to recommend a lower nic strength but you will still get a good ‘hit’.

      It’s difficult recommending a specific product as your wants may be different and I don’t know what you have used previously.

      But I will recommend a couple of devices/kits that give you a similar smoking experience.

      Innokin Endura T18 or Endura T22
      Aspire K3 Kit

      The above kits are all ‘Plus-Ohm’ kits. So all coils above 1.2Ohm that are a closer match to the cigarette smoking sensation. It’s recommended to use a juice upto 50/50 VG/PG for these.

      There are recommended box mods here.

      Or if you can be more specific in terms of size, vaping style (clouds, more of a cigarette smoking experience) I will try and narrow down. Let me know the make and models of what you have used and are currently using.

      But..Not to sound like a broken record! Try a different juice or different nicotine strength first 🙂

      Thanks and hope it helps a little.

      It can be a pain at first finding something that works for you. Once you have that device though you will be good to go. So be patient, it’s worth the wait! We will help you get sorted.



  7. Hi , i have just bought the coolfire plus TC100 but i`m not that pleased with the v tank that it came with , i also have a coolfire plus with the isub Apex 3ml tank on which seams to produce alot more flavour and vape than the v tank does . i have tried all the different settings i can on the TC100 , the best i`ve found is using it with the SS BVC 316L 0.5ohm coil set at 45watts and 430 F in the ramp up setting , but still not as good a flavour as tha Apex . Does anybody know if i can use the Apex tank with the TC100 if i buy one , or any other good compatible tanks to use with the Coolfire TC100 ????

  8. I’ve got an evod mega and have just bought a subtank nano , will I be able to use this with the 1.2ohm coil? Thanks in advance

  9. Hi there I have the kangertech evod mega and was wondering if it fires isub tanks or other sub ohms tanks add I world like to mix up lung to mouth and straight to lung inhaling the evod mega battery is 1900mah..

    • Hey Ade,

      Thanks for dropping by.

      The Kanger Evod Mega won’t work with sub ohm tanks. These tanks have coils that are below 1.0Ohm resistance that the Evod isn’t compatible with unfortunately.

      There are some great sub ohm vape pens that have just hit the market that are friendly on the pocket if you are open to a separate device.

      Check out the SMOK Vape Pen 22, provides great flavour and performance. Think it’s only around £22 delivered.

      If you go sub ohm it’s a good idea (depending on the nicotine strength e liquid you use) to drop the strength t0 3mg or 6mg.

      Any other questions on the above please ask.



  10. hello, I just purchased a smok osub 40w kit and was wondering if I can put my kangertech subvod tank on to my smok mod without it blowing up or damaging it?

  11. Sub ohm vaping is definitely where it’s at! The flavor of the eliquid pops, it’s just perfect! When I started sub ohm vaping I thought to myself where has this been my whole life and why didn’t I know about this sooner!

  12. Hi

    I’m new to this Vaping and just got myself a Smok OSUB 40W kit.

    I’ve been told that you have to use a Certain Mix/Strength of juice depending on the Coil being used.

    The Coils I have with the kit are a 0.4 Fused Clapton Dual Core and a .1 Single Clapton Core.

    Can someone advise what strength juice would be suitable.


    • Hey Anthony,
      When sub ohm vaping (coils below 1.0 Ohm) then it is recommended to drop your nicotine level. As you haven’t vaped before then I can see why this must be difficult 🙂
      Is the single Clapton 0.1 or 1.0 Ohm? I think it’s the latter, I was just using the SMOK Osub kit last week.
      I personally vape 3mg nic strength at 0.4/0.5. And I used 3mg/6mg with the 1.0 Ohm coil. And I use a mix of e-liquid with a 60VG / 40PG mix. You will be OK with 50/50 – 70VG/30PG though.
      As you are new to vaping then it will be a case of experimenting with 2 or 3 nicotine strengths.
      With 3mg, you will be able to use this with both of your coil options no problem.
      With 6mg, you will likely be able to use this with both coils, although it *could* be on the strong side with the 0.4 coil.
      With the 1.0Ohm coil you may well need 12mg nicotine strength to be satisfied.
      Again, Anthony, it’s a personal preference and the only way you will really know it to try a few juices out. Don’t mean to sound too vague but it all comes down to personal preference. What is good for one may not be for another.
      If you start on the 3mg and 6mg though you can always work it from there.
      Anything else let me know. Be interesting to hear how you get on as well!

  13. Can I use a 1.0 ohm coil with an Isub tank and a cool fire iv I want to go out and buy a pack or a couple 1.0 coils
    thanks Josh

  14. Sub-ohm builds often let users to enjoy much more flavor than customary clearomizers. As the vapor is exceptionally thick, it is possible to taste more of your premium e-liquid with each hit. And, in combination with organic cotton wicking material, sub-ohm coils can provide a vape with a very intense and clear taste.


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