Uwell Crown 4 IV Review: Leak Resistant Sub-Ohm Tank?

Are you about to buy the Uwell Crown Crown 4 Vape Tank?

I know the market is flooded with tons of other cloud chasing tanks that would make it hard for you to make a decision if the Uwell Crown IV is the best option or not.

But if you have this tank in mind, it means that there is something special about it that attracts you to it. 

What attracts you to the tank might not be enough for you to make the decision of buying the tank; this is why we want to unravel the Crown IV package and see if it is a good option for a vape.

Some of the review factors that will be looked into are info about the product, specs, unique features, pros & cons, and the price.

Review Summary: Uwell Crown IV Tank

One thing that will strike you the moment you see the Crown IV is the shining glass canister that gives a clear view of the e-juice inside your tank. It is a proud moment to showcase your e-juice in a tank, thus, making the Crown IV a unique tank in the market. 

Since its release, the Crown IV has remained a great option for vapers who enjoy fancy tanks with large capacity for e-juice. 

The average rating of the tank per review factor is as follows:

  • Design______9.5
  • Build quality__9.4
  • Coils_______9.6
  • Performance__9.6
  • Flavor______9.7

Uwell Crown IV Sub-Ohm Tank – A Quick Look

  • Simple to use with an optimized top cap
  • Has a self-cleaning technology with no leakage
  • Has a large e-juice storage capacity
  • Compact and stylish design
  • Lasts longer
  • Excellent flavor
  • Multiple  color options
  • Coils do not produce heavy clouds
  • Not as portable as smaller tanks
  • There are claims that the tank can leak if not placed properly.


The specs of a cloud chasing tank are the most reliable pieces of information that you should find in a review. These specs give you a mechanical picture of the vape tank allowing you to make an informed guess about its performance based on your desires from a vape tank.

  • Capacity: 6ml; 5 ml if you are using a straight glass
  • Diameter: 28mm
  • Height: 54.8mm
  • Weight: 55g
  • The material used: stainless steel, pyrex glass, and silicone
  • Thread type: gold-plated 510 connection
  • Maximum wattage: 80W
  • Bottom adjustable airflow control

An amazing thing that can be noticed from the specs is the tank holding capacity against its size. You will notice that it has a compact design that holds the e-juice well. You should also be aware that you will only be using 5ml e-juice if you have a straight glass and 6ml with the normal glass. 

What is included in the package?

If you are buying the Uwell Crown IV vape tank from a reliable seller, or directly from the manufacturer, you will get the following in your package:

  • 1 Crown IV tank
  • 1 spare glass tube
  • A preinstalled coil (0.4ohm)
  • 1 0.2ohm coil
  • 1 pack of replacement O-rings
  • 1 Drip tip cover
  • User’s manual

From a review perspective, you seem to be getting a lot in the package than you would in most top cloud chasing tanks. 

Unique Features 

This is one of the unique tanks with amazing features. The tank even boasts of a new technology that no other top tank has, the patented self-cleaning technology. More of this will be discussed below:

Design and quality 

Patented self-cleaning technology

Of the many features of the tank’s design and quality, the patented self-cleaning technology is the most admirable by many users. Of course, this might have a little to do with the performance of the tank but is surely a feature that you cannot get in all the top tanks that we have. 

The Crown IV patented self-cleaning technology saves you the stress and energy of cleaning the tank manually. The atomizer absorbs the e-juice found in the condensation holder and vaporizes it to clean the tank. However, this does not mean that you will never have to clean the tank manually; you still will clean it but the frequency would be greatly reduced. 

Appearance and color options

Are you the kind of a vaper who is concerned about the color and appearance of your tank? Well, the Crown IV might just be the one for you because it has an amazing appearance with a variety of color options. 

The colors that you can choose from are black, blue, silver, iridescent, green, and purple. They all give different impressions, thus, you should know the kind of impression you want with your tank e.g. black and silver might show elegance while purple or iridescent might appear fancy. 

The polishing of this device is top-notch. 


The score of Crown IV’s durability is nearly the same as other top vaping tanks that use the stainless steel as a material in the manufacturing process. You can count on it to last long. Furthermore, it has a compact design that makes it even more durable. 

Coils and performance

  • Coils 

It boasts of the dual helix coil system to give you the options of the coil to use depending on your preference of flavor and cloud, based on the maximum wattage. The heating space of the coil is larger, making it heat evenly resulting in better flavors. You also get some sort of guarantee for good clouds if you optimize the use of the two coils.

  • Performance

The performance of the atomizer is boosted by the Pro-Flavor Optimization Core System (Pro-FOCS). This system ensures that you get the best flavor as you enjoy your vaping experience. 

However, you need to be aware of the fact that the system does not give you a guarantee of big clouds. Therefore, hardcore vapors might find the tank’s 80W maximum wattage insufficient for their dream vaping experiences. 


The patented self-cleaning technology sets this tank apart from other competing brands. But, is this feature enough to sway you to the direction of buying this tank? Well, this is up to you to decide. However, it remains an excellent tank, rated highly by many online reviewers.