JayBo and Wismec have teamed up once again alongside Suck my Mod to bring you the Wismec Theorem RTA.Wismec Theorem RTA review

What Can We Expect From The Theorem By Wismec?

The Theorem is a highly innovative new re-buildable tank atomiser that features a style of coil never seen before, the NotchCoil.

The NotchCoil is a newly patterned coil, manufactured from 316L Stainless Steel and optimised to bring you a fast ramp up time alongside excellent flavour and vapour production.

It’s also able to be used in single or dual coil mode as well, and the NotchCoil has been optimised for use in a wide wattage range, from 30-70w.

There’s been a lot of thought put into the design of the tank, it has a 2.7ml tank capacity alongside the ability to fully disassemble it to make rebuilding and re-wicking easy.

A unique top filling system can be found here, alongside top and rear airflow.

This is looking like one of the most innovative tanks to have come out in a long time, lets see how the Wismec Theorem shapes up!

Kit Contents

  • Wismec Theorem RTA
  • Replacement single and dual airflow rings
  • Replacement glass tank
  • Stainless Steel glass tank sleeve
  • Two NotchCoils pre wicked with cotton
  • Spares pack containing o-rings, hex key and post screws
  • User manualWismec Theorem box contents

Key Features

  • 22mm width
  • Stainless steel construction
  • Glass tank section
  • 2.7ml capacity
  • Brand new NotchCoil with cotton wick
  • Single or dual coil option
  • 0.25ohm resistance
  • Optimum wattage range: 30 – 70W
  • Open wicking system
  • Top filling
  • Top airflow juice plug
  • User-friendly airflow control
  • Single or dual airflow
  • Leakproof design
  • Gold plated 510 connector

Build Quality and Design

Looking at the Wismec Theorem, you will notice that this is quite unlike any other tank out there.Wismec Theorem rta tank

Starting from the top, you will notice that there is a removable glass drip tip and heat dissipating fins, you’ll need to remove this section in order to adjust the airflow control.Wismec Theorem RTA parts

The glass tank section can be swapped out for a stainless steel one however, I saw no real need for this other than aesthetic reasons, and with the stainless steel tank section installed you can’t see how much juice is left in the tank.Wismec Theorem steel

The capacity of the Wismec Theorem is 2.7ml and this is refilled via a top filling system.

When you remove the top cap you will see the single coil plug installed. You fill through the hole in this however, do be careful as it is very easy to overfill!Wismec Theorem top fill

At the base of the tank there is a gold plated 510 connector which has been used in order to increase conductivity.

The Wismec Theorem features a stainless steel construction alongside a glass tank section, although to me the overall build quality felt light and flimsy.

The tank section is held on with o-rings, and I found it fairly easy to take this apart to disassemble.Wismec Theorem rta jaybo review

The whole tank can be disassembled which is great for cleaning, and it makes the Wismec Theorem really easy to rebuild and rewick as you have full access to the build deck.

Wismec Theorem Build Deck

One of the first things that I did notice was that there is an awful lot of wick present with the pre installed NotchCoil build, and I made sure to trim this back before I used the Wismec Theorem for the first time as it looked like a dry hit waiting to happen!Wismec Theorem RTA notch coil

Thankfully, once I had trimmed the wick back a little I am happy to report that I didn’t suffer any issues with wicking, there were no dry hits or leaks to report.

To access the build deck you simply remove the tank section which gives you full unobstructed access to the deck.

There is a single NotchCoil already installed and wicked for you, with a single coil reducer on the other side. This can be removed if you wish.Wismec Theorem RTA wicking

The Wismec Theorem can be built with either a single or dual coil build, however if you do wish to build dual coils then you must use vertical coils due to deck having two large wicking holes on one side and a single wick/fill hole on the other.

The middle positive post features a large cut out and you need to trap your coil leg down under the post screws found here. This is a little on the tricky side and I would imagine this can be a little difficult for people new to rebuilding!

How Does The Wismec Theorem Perform?

I was really excited to see how the NotchCoils performed and I found these to give very good results in the flavour department.Wismec Theorem notch coil

They are rated for use at 30-70w, I found that 30w was a little on the weak side and 70w made the Wismec Theorem far too hot, the best results for me came in the 35-40w range.

I was very impressed with the flavour from my current go to, Wick Liquor Boulevard vape juice, and there is a decent amount of vapour as well, which I actually didn’t expect!Wismec-Theorem RTA on RX200S mod

That being said, the Wismec Theorem does get through e-juice, very quickly indeed.

The tank capacity is 2.7ml and this does not last long at all, it wicks juice very quickly and you will be refilling this tank very often throughout the day.Wismec Theorem RTA by Jaybo suck my mod

It does wick juice well, as long as you don’t use too much wick. It copes with high VG juice without a problem at all.


Interestingly, the Wismec Theorem has top as well as side airflow included.

To adjust the airflow, you need to remove the drip tip, then adjust the airflow control as you see fit.

It’s quite an airy draw, but still a little on the restricted side, it definitely isn’t as airy as many sub ohm tanks that are available these days.

Wide open, you are looking at a restricted lung hit, and with the right build you can even close the airflow right down for a mouth to lung hit.

What I Liked

The flavour from the Wismec Theorem is really top notch. Once you have the wicking nailed down correctly, this definitely is a flavor machine!

The NotchCoil is an excellent invention from the JayBo and Wismec team. It’s a very unique design, quite unlike anything else out there, and in practice these give off great flavor and vapor production.

You are also able to use these coils within a wide wattage spectrum. Plus they look very cool too!

The airflow system works very well once you have got used to it, and offers you a lot of different airflow options. Plus with the included airflow rings, you have the option for single or dual airflow as well.

What I Didn’t Like

The build quality to me feels a little on the flimsy side and cheap. I felt that the tank came apart a little too easily, and the glass feels thin too, which I really doubt would survive a fall!

The Wismec Theorem features a 2.7ml capacity which in practice does not last long at all.

Even using less vape cotton has no real impact on the juice consumption. The wide wicking channels ensure this gets through juice extremely quickly indeed.

You have the option for dual coils to be used, but I didn’t find this to be a very good experience.

If you do use dual coils, you are limited to using vertical coils due to the deck set up. I found it a bit of a faff to fill the tank with a dual coil build, and my Theorem tank got very hot during use.

The build deck offers you a lot of room to work with, however having to slot your coil leg into the slot in the positive post is a real pain and makes it quite tricky and difficult to install your coils.

Final Review Verdict

There are some great ideas in practice with the Wismec Theorem, and these are executed well, I particularly liked the airflow system (once I got used to it) and how easy it was to disassemble to clean and rebuild.

There’s a lot of different build options available to you here, and the NotchCoils do perform very well indeed, with some very nice flavour and decent clouds to match.

If you are looking for a unique tank, that offers something a little different from the norm, then this is definitely well worth a look.

However in my personal opinion there are a lot of things that need improving upon with the Wismec Theorem, which I would hope to see put in practice should there be a second revision of this tank!


  • Excellent flavor
  • Unique design
  • Easy to rewick
  • Can fully disassemble the tank to maintain
  • Single or dual coil build options
  • Good airflow


  • Feels cheaply made
  • Gets through juice extremely quickly
  • Too much wick with the pre installed build
  • Gets too hot with dual coils
  • Can be a bit tricky to build
  • Airflow control takes time to get your head around
  • Top filling system isn’t the best out there
  • Can leak when filling if you aren’t too careful
Build Quality
Ease Of Use
Likelyhood Of Replacing If Lost Or Damaged
Been vaping full time for three and a half years, started on cigalikes for a fair while then curiosity got the better of me and I moved onto an ego/ce5 set up after, a month or two later I was seeing people walking around with these interesting shiny tubes and I thought 'I gotta get one of those'. Before I knew it a trip down to my local B&M got me my first VW mod, an Innokin SVD, paired with an iClear 30, and I was hooked. Soon after that I was jumping to VW mods both box and tube shaped, before I then made the jump to rebuilding and thus sub ohming, with my first RDA and mech mod. These days I'm still preferring mechanical mods, but using VW mods with both RDA's and tanks alike whilst on the move, most importantly I am still loving vaping!


  1. I like it far as flavor goes hits good but needs too have more juice capacity and the fill part dose kinda suck other that that it’s not bad


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