What Is a Vape Tank? A Complete UK Guide (2026)
A vape tank is the part of a vaping device that holds e-liquid and delivers it to the coil, where it is heated to produce vapour. It is an important component of many refillable vaping devices, particularly traditional vape mods and some larger vape kits.
Vape tanks come in different shapes, sizes and designs. Some have replaceable coils, adjustable airflow and removable glass sections, while others use simpler integrated designs.
If you are new to refillable vaping, understanding how a vape tank works can help you choose compatible replacement parts, fill it correctly and maintain it properly.
In this guide, we explain what a vape tank is, how its different parts work, the types available and what to consider when choosing one.
What Does a Vape Tank Do?
A vape tank stores e-liquid and supplies it to the coil through an absorbent material, usually cotton.
When the device is activated, the coil heats the e-liquid absorbed into the wick, producing vapour that travels through the tank's chimney and mouthpiece.
A typical vape tank performs several functions:
- Stores e-liquid ready for use.
- Supplies e-liquid to the coil.
- Houses the coil and wick.
- Directs airflow through the device.
- Channels vapour towards the mouthpiece.
- Allows users to refill the device when the e-liquid runs low.
The tank is usually connected to a powered device, which supplies the electricity needed to heat the coil.
What Are the Main Parts of a Vape Tank?
Although designs vary, most traditional vape tanks contain several common components.
1. Tank Glass or E-Liquid Reservoir
The reservoir is the section that holds the e-liquid.
Many tanks use a glass section, often made from glass designed to withstand everyday use. Some use alternative materials or integrated reservoir designs.
The reservoir allows you to see how much e-liquid remains, making it easier to recognise when a refill is needed.
2. Coil
The coil is the heating element inside the tank.
It receives electrical power from the device and heats the e-liquid absorbed into the wick.
Coils are available in different resistances and designs, depending on the tank and intended vaping style.
It is important to use a coil specifically designed for your tank. Coils that look similar are not necessarily interchangeable.
3. Wick
The wick is the absorbent material that carries e-liquid towards the heating element.
Most replaceable vape coils use cotton as their wicking material.
The wick needs to remain adequately saturated during use. If it becomes too dry while the coil is heating, it can produce an unpleasant burnt taste.
4. Airflow Control
Many vape tanks have adjustable airflow openings.
These allow you to control how much air enters the tank and passes through the coil.
Opening the airflow generally creates a looser draw, while closing it makes the draw more restricted.
The available airflow settings depend on the tank design and the coil being used.
5. Chimney
The chimney is the internal passage that directs vapour from the coil towards the mouthpiece.
Its design can influence the airflow path and overall draw of the tank.
6. Mouthpiece or Drip Tip
The mouthpiece is the part you place your lips around when inhaling.
Some tanks have removable drip tips, while others use integrated mouthpieces.
Different designs can affect comfort and the feel of the draw.
7. Top Cap and Filling Mechanism
The top cap covers the upper section of the tank and may contain the filling mechanism.
Depending on the design, you may slide, twist or remove part of the top section to access the filling port.
How Does a Vape Tank Work?
A vape tank works by combining e-liquid storage, wicking, heating and airflow.
The process is straightforward:
- E-liquid is added to the tank through its filling port.
- The wick inside the coil absorbs the e-liquid.
- The device supplies electrical power when activated.
- The coil heats the absorbed e-liquid.
- Air passes through the coil and carries the resulting vapour.
- Vapour travels through the chimney and exits through the mouthpiece.
The tank itself does not generate vapour. It works alongside the battery-powered device and the coil.
What Are the Different Types of Vape Tank?
Vape tanks come in several designs, with different filling systems, coil arrangements and airflow characteristics.
Sub-Ohm Tanks
Sub-ohm tanks are designed to work with coils below 1 ohm.
They are commonly used with higher-powered devices and are generally associated with direct-to-lung vaping.
These tanks often feature:
- Lower-resistance coils.
- Larger airflow openings.
- Higher recommended wattage.
- Greater vapour production.
- Higher e-liquid consumption.
Not every sub-ohm tank has the same specifications, so it is important to check the manufacturer's recommended coils and wattage range.
MTL Tanks
MTL stands for mouth-to-lung.
MTL tanks are designed to provide a tighter, more restricted draw. They commonly use higher-resistance coils and lower power settings than traditional sub-ohm tanks.
They may also use smaller airflow openings and different mouthpiece designs.
If you want to understand the inhalation style in more detail, read our guide to what MTL vaping is.
RTA Tanks
RTA stands for Rebuildable Tank Atomiser.
An RTA is a type of tank that allows users to install their own coils and wicking material rather than simply replacing a pre-made coil.
These tanks generally require more knowledge and maintenance than standard replaceable-coil tanks.
Users need to understand coil installation, resistance, wicking and safe device operation.
RDTA Tanks
RDTA stands for Rebuildable Dripping Tank Atomiser.
An RDTA combines aspects of a rebuildable dripping atomiser with a tank that stores e-liquid.
It uses a rebuildable coil deck, with e-liquid supplied from the reservoir to the wick.
RDTAs are generally more advanced products and are not usually the simplest option for someone new to vaping.
What Is the Difference Between a Vape Tank and a Vape Pod?
Although both hold e-liquid and supply it to a coil, vape tanks and pods are not exactly the same.
A traditional vape tank is usually a separate component that connects to a compatible device.
A pod is generally designed to fit into a specific pod system and may contain its own reservoir, coil or replaceable coil section.
| Feature | Vape tank | Vape pod |
|---|---|---|
| Design | Often a separate tank | Usually a dedicated cartridge |
| Connection | Commonly screws onto a compatible device | Usually slots or clips into the device |
| Coil | Often replaceable | Integrated or replaceable |
| Filling | Top-fill or bottom-fill designs | Side-fill, top-fill or other designs |
| Compatibility | Tank and device connection must match | Usually designed for specific devices |
| Maintenance | May involve several replaceable parts | Often simpler |
| Common use | Traditional vape kits and mods | Pod systems |
Some modern devices blur the distinction, particularly pod-mod systems that use replaceable coils and larger refillable pods.
How Do You Fill a Vape Tank?
Filling a vape tank correctly helps prevent spills and reduces the chance of liquid entering the central airflow chimney.
Although the exact process varies, most refillable tanks follow similar steps.
Step 1: Check the Filling Mechanism
Identify whether your tank uses a sliding top cap, twist mechanism or removable top section.
Follow the manufacturer's instructions rather than forcing any part of the tank.
Step 2: Open the Filling Port
Access the designated filling opening.
Avoid pouring e-liquid directly into the central chimney, as this is generally the airflow passage rather than the filling area.
Step 3: Add E-Liquid
Carefully fill the reservoir through the correct opening.
Do not exceed the tank's maximum fill line or capacity.
Step 4: Close the Tank
Secure the filling mechanism and check that any seals are correctly positioned.
Step 5: Check for Leaks
Wipe away any spilled e-liquid and inspect the tank before using it.
Step 6: Allow a New Coil to Saturate
If you have installed a new coil, allow the wick to absorb e-liquid according to the manufacturer's instructions before activating the device.
What Is the Difference Between Top-Fill and Bottom-Fill Tanks?
The main difference is where you access the filling port.
Top-fill tanks are filled through an opening near the top of the tank. Depending on the design, the top cap may slide, twist or unscrew.
Advantages can include:
- Convenient refilling.
- Less need to remove the tank from the device.
- Easier access on many modern designs.
Bottom-fill tanks are filled through an opening accessed from the bottom section.
These designs may require you to remove the tank or unscrew part of its base before filling.
The filling method does not automatically determine how well a tank performs. Compatibility, coil design and build quality are also important.
What Coil Should You Use in a Vape Tank?
The correct coil depends on the specific tank.
Manufacturers design coils to fit particular tank models or product ranges. Even if two coils look similar, they may have different dimensions, connections or electrical characteristics.
Before buying a replacement, check:
- The tank's exact model.
- The compatible coil series.
- Coil resistance.
- Recommended wattage.
- Intended vaping style.
- E-liquid compatibility.
Some tanks are designed for MTL vaping, while others support RDL or DTL setups.
Our guide to what vape coil resistance means explains how resistance relates to power and coil performance.
Why Is My Vape Tank Leaking?
A leaking vape tank can be caused by several things, including damaged seals, incorrect assembly, overfilling or an unsuitable coil.
Common causes include:
- Worn or damaged O-rings.
- Loose tank components.
- Incorrectly installed coils.
- Damaged glass.
- E-liquid entering the central airflow chimney.
- A coil that is not seated correctly.
- Incorrect e-liquid for the tank.
Start by checking the tank's seals, coil installation and filling mechanism.
If the tank is cracked or has damaged components, stop using it until the problem has been resolved.
For a more detailed troubleshooting guide, see our article on why your vape is leaking.
How Do You Clean a Vape Tank?
Cleaning a refillable tank helps remove old e-liquid residue and can improve the experience when changing flavours.
For a standard tank, the general process is:
- Remove the tank from the powered device.
- Empty any remaining e-liquid.
- Remove the coil, where the design allows.
- Disassemble the tank according to the manufacturer's instructions.
- Rinse suitable removable tank components with warm water.
- Dry all components thoroughly.
- Reassemble the tank and install a suitable coil.
Do not rinse the electronic device, and avoid washing components that contain electronics or cannot safely be exposed to water.
Never install a coil or fill the tank while water remains inside the parts.
Our guide on how to clean a vape properly explains the cleaning process in more detail.
When Should You Replace a Vape Tank?
A vape tank does not necessarily need replacing every time you change the coil.
Many tanks are designed to last through multiple coil replacements, provided they are maintained and remain in good condition.
However, you may need to replace the tank if:
- The glass is cracked.
- The tank has damaged threads.
- Filling mechanisms no longer close properly.
- Airflow controls are broken.
- Seals are damaged and cannot be replaced.
- Persistent leaking continues despite correct assembly.
- Replacement components are no longer available.
If the tank itself is in good condition but the coil has deteriorated, replacing the coil may be all that is required.
How Do You Choose the Right Vape Tank?
Choosing a vape tank involves more than looking at its appearance or capacity.
Consider these factors before buying.
Device Compatibility
Check that the tank is compatible with your device.
Traditional tanks commonly use a threaded connection, but connection compatibility alone does not guarantee that the device can safely operate the tank's coils.
Coil Availability
Check whether replacement coils are readily available and how much they cost.
A tank may seem inexpensive initially, but ongoing replacement costs are worth considering.
Vaping Style
Think about whether the tank is designed for MTL, RDL or DTL vaping.
Different designs provide different airflow characteristics and require different coil configurations.
Filling Design
Consider whether you prefer a top-fill or bottom-fill mechanism.
A convenient filling system can make everyday use easier.
Airflow Adjustment
Adjustable airflow gives you greater control over the draw.
Check whether the tank offers the level of restriction you prefer.
Maintenance
Some tanks are easier to disassemble and clean than others.
If you want something straightforward, a standard replaceable-coil tank may be more suitable than a rebuildable design.
UK Compliance
If purchasing a tank in the UK, check that the product is intended for the UK market and complies with the applicable requirements.
UK consumer e-cigarette rules include restrictions on tank capacity for relevant products. Check current official guidance from the UK government before purchasing.
Final Thoughts
A vape tank is an important part of many refillable vaping devices. It stores e-liquid, houses the coil and directs airflow towards the mouthpiece.
Different tanks are designed for different vaping styles, with variations in coil resistance, airflow, filling systems and maintenance requirements.
Before choosing a replacement tank, make sure it is compatible with your device and that suitable coils are available.
Understanding how the tank works can also help you identify common problems, refill it correctly and maintain it for longer.
FAQ - Vape Tank?
What is a vape tank?
A vape tank is the part of a vaping device that stores e-liquid and supplies it to the coil, where it is heated to produce vapour.
Do all vapes have a tank?
No. Some devices use refillable or prefilled pods instead of a traditional separate tank. The design depends on the type of vaping device.
How long does a vape tank last?
There is no fixed lifespan. A tank can last a long time with proper care, but cracked glass, damaged seals, faulty connections or broken filling mechanisms may mean it needs replacing.
Can you replace the coil without replacing the tank?
Yes. Many traditional tanks have replaceable coils, allowing you to install a new coil while keeping the tank itself.
Are vape tanks universal?
No. Tanks and coils are not universally compatible. Check the connection, device power range and manufacturer's compatibility information before buying.
Why does my vape tank keep leaking?
Common causes include damaged seals, incorrect assembly, overfilling, loose components or an incorrectly installed coil. Check the manufacturer's instructions and inspect the tank for damage.
How often should you clean a vape tank?
It depends on how frequently you use it and whether you are changing flavours. Cleaning when changing e-liquid flavours or when residue builds up can help keep the tank in good condition.
What is the difference between a vape tank and an atomiser?
An atomiser is the component that heats e-liquid to produce vapour. A traditional vape tank is a type of atomiser that includes a reservoir for storing e-liquid.