Wismec Theorum Review by VapeMaster

Review Date: 

Wismec Theorum

The Theorum designed by Jay-Bo and produced by Wismec is a hybrid style 22mm RTA that borrows heavily from traditional Genesis style designs as well as adding some unique features of its own. The Theorum holds 2.7ml of E-Liquid and features a unique style of deck with the cotton wick trailing into the bottom of the tank. Unlike traditional Genesis style tanks the Theorum is designed not to leak and features both top filling and adjustable airflow.

Wismec Theorum features

  • Designed by Jay-Bo
  • Designed for maximum flavour intensity
  • Suitable for dual or single coil builds. Caters to horizontal and vertical coil set ups
  • Two included airflow rings to cater to single and dual coil uses
  • Adjustable airflow
  • Open Wicking System
  • Ceramic Insulator
  • Removable Top Cap for Easy Deck Access
  • Utilizes the Revolutionary Notch Coil Design
  • Leak-Free Design
  • Reduced Chamber
  • Top-Fill Design
  • Split Positive Post Design
  • Deck-Milled Negative Posts
  • Top Airflow Design
  • Massive Vapour Production
  • 304 Grade Stainless Steel and Pyrex Construction
  • 510 Threading
  • Capacity: 2.7ml
  • Length: 46.25mm
  • 22mm Diameter

What’s in the box?

  • 1 x Wismec Theorem RTA Atomizer
  • 2 x Airflow Control Rings for single or dual coil builds.
  • 1 x Stainless Steel Sleeve.
  • 1 x Glass Sleeve pre-fitted.
  • 1x Extra Glass Sleeve.
  • 2 x 0.25ohm Notch Coil’s with Cotton Wicking.
  • 3 x Silicone O-Rings.
  • 4 x Screws.
  • 1 x Allen Key.
  • 1 x Warranty Card
  • 1 x User Manual

In my opinion the included extras are excellent value for money and I really wish more products came with this much stuff. You get a single coil and dual coil appropriate airflow control ring as well as a spare glass sleeve and a Stainless Steel one. In addition there are spare screws, an Allen key and spare O-rings plus an extra notch coil that is also pre-wicked for you.

Wismec Theorum styling and build quality

The Theorum is constructed entirely from Stainless Steel and features a glass tank sleeve and an additional Stainless Steel one. The machining is excellent and everything fits together really well. Unlike a lot of tanks there is very little threading on the Theorum apart from the 510 connection and most of the parts simply push fit together. With a practically non-threaded design you might assume that the tank would loosen and parts would come off but that is not the case since it is very well designed.


The coils are fitted to the upper part of the deck and the wick hangs done into the juice reservoir beneath it. The tank comes with two notch coils, one of which is pre-fitted and wicked for you. The notch coils require a great deal of wicking and the wicks should always hang right down to the base of the tank.

In addition you can happily rip out the notch coil if you don’t want to use it and put your own build in the Theorum. The design caters to both single and dual coil builds and allows you to position coils either horizontally or vertically. There is a plug included which push fits into the deck for people who prefer single coil builds, in fact this is how the Theorum is already set up for you.

The post holes are reasonably large to accommodate most typical builds and the screws are decent and do not cut the wire. The Theorum has several very sturdy O-rings which serve to keep the various parts nice and secure. Should they ever suffer from wear you can happily replace them with the extras in the box.

The wicking holes are suitably large and the real beauty of the design is that you push your cotton through the holes and then slide the glass sleeve over the top which keeps things really simple!

I tried the Theorum with several devices and I happy to say that it fitted well on each of them with no visible gap. The included drip tip is made from Stainless Steel with a Pyrex mouth piece. It is quite short and the fit is a little wobbly.


The tank is top filling and you simply remove the top cap where you will notice the ceramic insulator attached to it as well as the adjustable airflow ring which is removable. To be honest the airflow ring is the only thing that I really didn’t like because it tends to come loose when unscrewing the top cap which means you have to adjust it every single time you refill. In addition you have to hold it in position when screwing the top cap back on. At the end of the day it is only a minor issue but it did annoy me a little.  


There are two airflow rings included with the Theorum. Both are designed with air being directed downward at the coils. The air slots at the top are Cyclops style in design and by adjusting the ring itself you can either have them fully opened up or heavily closed down according to your tastes.

In single coil mode it is somewhat airy but not to the extreme of some Sub Ohm tanks. It is designed for a direct lung inhale but one that is somewhat restrictive. Closing the airflow down you can kind of get away with mouth to lung vaping in single coil mode but you may still find it a little loose. Personally I found it okay and still enjoyable.

Ease of use

The Theorum comes with a decent user guide that includes diagrams so you shouldn’t have any serious issues. The fact that the tank pretty much push fits together means things are kept simple.


One word of caution when filling, keep in mind that due to the amount of cotton in there some high VG liquids take longer to travel to the bottom of the tank. Make sure there is no juice above the deck or you will get hot E-Liquid in your mouth when vaping which is not pleasant. The Theorum does actually hold more juice than its specified 2.7ml because the large amount of cotton soaks up a lot.

How does it vape?

The Theorum offers a seriously good vape, very warm with fantastic flavour and lots of cloud production! The draw is really pleasant and while somewhat airy it is never overkill. I tried a few different E-Liquids in the Theorum, some Manabush Powwow Sauce, some Moo ELiquids Strawberry Milkshake and also some El Toro Eden. All of them were a superb vape!

Unlike traditional Genesis tanks you don’t actually need to keep tilting the tank since the wicking keeps up extremely well and I never experienced a dry hit. The notch coils do ramp up seriously fast so take care when vaping for the first time because it can result in a very hot vape. I found 50W to be perfect for me.  

While the Theorum for the most part is leak free do make sure not to turn it upside down since due to the design juice can still leak out of the drip tip. I had no spit-back issues when vaping the Theorum but it will happen if you accidentally fill above the deck.



In terms of the vape it offers as well as the included extras and the overall excellent machining this is a product that is well worth picking it up! While I do find the airflow ring ever so slightly annoying it seems like a very minor nit-pick (you do get used to it) when you consider the package as a whole. At least by making the airflow ring a separate piece it allows for greater flexibility with dual or single coil setups. The included notch coils are superb and ramp up extremely fast. The flavour the Theorum offers is fantastic and while it may not to be as a good as a dedicated flavour dripper (depends a lot on your personal taste and opinion) it does approach that level of quality!

Vapour production is also top notch even when vaping at 60W with a single notch coil and the draw while somewhat airy is not quite as in your face as some Sub Ohm tanks.  

One issue that perhaps make the product a little less desirable is its limited 2ml capacity which is at least TPD compliant. This is of course offset by the fact that the large amount of cotton wicking soaks up a lot of juice and many I time I have still been vaping away with an empty tank and not had any dry hits.

The Theorum is a very unique hybrid style RTA that will give you a highly enjoyable vape!

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