Last winter, a manager from a popular chain of 18 lounges in Germany, reached out to one of his B2B suppliers with a time-critical request. Providing 26mm cubes for phunnel and standard bowls, alumimium foils, heat management devices (HMDs) and even small heads designed for quick style sessions, created problem for the supplier. His loss of income was severe; burnt tobacco, negative customer feedback regarding harsh, smoky sessions, and a coal disposal budget that was overspent by 30%. However, within two weeks of switching to 22mm cubes for the smaller bowls, and 25mm cubes for the standard HMDs, his coal disposal budgets dropped by 22%, and his coal sessions also improved across all the lounges.

The painful experience described illustrates a lesson learned by so many purchasers of lounge charcoal supplies. Coal size is a significant component to consider for coal purchases. The difference of a few cubic millimetres may be the difference of a few units for coal purchases. Subscribers purchasing hookah coal cubes in bulk may see their expenses change significantly for repeat purchases due to the wrong choice being made.

This guide outlines the four most common cube coal sizes: 22mm, 25mm, 26mm, and 27mm regarding their heating patterns, bowl compatibility, HMDs, and other factors. Whether you are putting in your first bulk order or are working to optimize an order already placed, this guide will show you how to maximize your product to lessen the loss of income.

Importance of Charcoal Size for Commercial Lounges

The fuel needed for every hookah session is charcoal. Charcoal delivers the heat needed to vaporize the shisha tobacco. If there is no heat, then there are no thick clouds and no noticeable flavor. If there is too much heat, the shisha burns, and there are harsh and bitter clouds. This wastes the shisha, and it will need to be replaced sooner.

The size of the cubes determines how much heat a single cube of charcoal will deliver. A 22mm cube will have a volume of about 10,648 cubic millimeters. A 27mm cube will have a volume of 19,683 cubic millimeters, which is nearly 85 percent more. When you put three cubes on a bowl, this difference becomes even bigger: three 27mm cubes have about the same mass as five 22mm cubes. The size of the cube should be determined by the size of your bowl and how you manage the heat.

When purchasing by the bulk, the size of the cube will determine the price you pay for each session and how much space it will take up. Smaller cubes will be packed more tightly and take up less space. Larger cubes break more easily. Keeping this in mind will help you choose the best cubes for your coal.

The Four Cube Sizes: Specifications and Heat Profiles

22mm Cubes — Precision Heat for Small Bowls and Short Sessions

At about 8-9 grams each, the 22mm cube is the smallest commercially available size, and three of them combined provide about 24-27 grams of coconut charcoal. When used in a bowl, 3 cubes provide an aggressive heat that lasts 5-7 minutes and stabilizes for 25-30 minutes.

Heat profiles of 22mm cubes (3-cube setup):

• – Peak temperature: 350-400°F (176-204°C) at the bowl surface
• – Stabilized burn: 25-30 minutes
• – Total session time (including relights): 40-45 minutes
• – Recommended for use with small Egyptian bowls and mini Guide sur les bols Phunnels, and single-use heads

22mm cubes are great for precision heat applications. Small Egyptian-style bowls with 10-15 grams of packing, for example, can easily be burnt through with larger cubes. With a mini phunnel bowl and a dense dark leaf packing pack, 22mm cubes deliver an edge to the pack without burning the top layer and work excellently with a foil pack and a direct setup.

The drawback is burn time. The 22mm size means the cube will not last the entire session time. In lounges where the session is long (60-90 minutes as the minimum), the 22mm cubes require either a frequent relight or an increase in the coal count.

25mm Cubes: The Hookah Industry Standard for HMD Use

The 25mm hookah cube is the most common sized cube across the entire hookah industry. This cube weighs 11-12 grams, making it the ideal size for most standard bowl and HMD setups. Because of this size cube, suppliers can easily sell these in bulk to commercial lounges.

The following shows the heat curve profile for 25mm cubes in a 3 cube HMD setup

• – Peak Temperature: 400-450 °F (204-232 °C)
• – Stable Burn Window: 35-40 minutes
• – Total Session Time (Including Re-Lights): 55-65 minutes
• – Recommended Cubes: standard phunnel bowls, HMDs (Lotus, Provost, Stratus)

The 25mm cube is one of the most popular sized HMDs because of its versatility. In a Kaloud Lotus or similar HMD, three of the 25mm cubes create a heat curve that matches the thermal profile of most standard phunnel bowls that hold 15-25 grams of packed tobacco. The cubes work well with both blonde and dark leaf tobacco without the need for constant management.

For commercial lounges that use a variety of bowl styles, the 25mm cube is the safest and best choice. It works with most HMDs without overfilling the HMD, and it also allows for heat adjustment through the HMD’s venting or lid/cover. The 25mm cubes also work well for foil sessions, although the heat may be slightly too high for small bowls.

26mm Cubes — Optimal Heat Distribution for Large Bowls and Extended Sessions

The 26mm cube has become especially prominent with lounges that offer long-format sessions and large-bowl setups. With three 26mm cubes weighing in around 12–14 grams each, these lounges prep around 36–42 grams total coal, which is roughly equivalent to four 22mm cubes.

Heat curve profile for 26mm cubes (3-cube setup):

• – Peak temperature: 430–480°F (221–249°C) at the surface of the bowl
• – Stable burn window: 40–45 minutes
• – Total session time (re-light): 60–70 minutes
• – Best for: large phunnel bowls (25g+ capacity), deep HMD chambers, and foil-heavy sessions

Where 26mm cubes shine is in deep-bowl configurations. An Oblako phunnel or similar bowl with a capacity of 20–30 grams benefits from the extra thermal mass. The larger cube size also means less frequent coal changes— a single round of three 26mm cubes can push past the 60-minute mark if managed well, reducing staff intervention during peak hours.

When using the 26mm cubes, there is a compatibility caution. In a shallow bowl or a tight HMD chamber, 26mm cubes may sit too high, touching the HMD lid or creating an air gap that reduces heat transfer efficiency. Some HMDs designed for 25mm cubes cannot close properly with 26mm cubes. Always check cube compatibility before standardizing on this size.

27mm Cubes — Maximum Heat for Deep Bowls and Outdoor Sessions

The 27mm cube is the largest size, and they typically weigh 14–16 grams per cube. Using three 27mm cubes is equal to using 42–48 grams of coal. This is more than double the thermal mass compared to three 22mm cubes. This size cube is meant for specific applications, and not necessarily a general-purpose size.

Heat curve profile for 27mm cubes (3-cube setup):

Peak temperature: 460-520°F (238-271°C) at the bowl surfaceStable burn window: 45–50 minutes

Total session time (re-light): 70–80 minutes

Best for: massive bowls (30g+ capacity), outdoor/ventilated spaces, experienced smokers

For sessions that are held indoors, 27mm cubes are excessive. Due to the higher heat output, a standard bowl would be scorched in 27mm cubes. For specific situations such as an outdoors hookah bar or a lounge that serves a large bowl, 27mm cubes are the best option.

As a side note: Due to their larger mass, 27mm cubes are more likely to break during the lighting and transport. With a bulk purchase of 27mm cubes, expect an increase in breakage compared to smaller sizes. There is also a lower packaging density, so there will be fewer cubes per kilogram, which results in more frequent box changes.

Bowl Compatibility: Matching Size to Bowl Geometry

Bowl geometry heavily determines the best coal size and affects the amount of tobacco packed, heat distribution, and the amount of room for coals above the rim.

This sizing guide is as follows:

• – Mini bowls (8-12g capacity) use 22mm coal cubes only. Three 22mm cubes can provide the appropriate heat, while bigger sizes can burn the tobacco.
• – For Standard Phunnel bowls (15-20g capacity), use 25mm coal cubes for an ideal fit. Three of such cubes can easily fit in most Heat Management Devices (HMDs), or on foil.
• – Large Phunnel or Deep bowls (20-30g capacity), can use 26mm coal cubes due to their larger thermal mass. Three of these can handle a 25g pack.
• – Mega bowls (30g+ capacity) and outdoor service can use either a 27mm coal cube or a mixture of 25mm and 26mm cubes. The large thermal mass of the tobacco means it needs higher initial heat to bring it to its vaporization point.

A common mistake made is using one coal size for all bowls. A lounge using mini bowls for quick lunch sessions and large phunnel bowls for evening service needs to carry at least two coal sizes. The price of stocking the two sizes is much less than the waste caused by mismatched sessions.

HMD Compatibility: Fit and Airflow

Heat Management Devices have chambers that accommodate different sizes of coal. Using the wrong size can damage the device and decrease its efficiency.

HMD compatibility by model:

• – Kaloud Lotus I/III: Uses 25mm cubes, three fit with some space left for airflow. 26mm cubes fit, but they touch the lid. 27mm cubes do not fit without forcing the lid shut, which can warp the device.
• – Shishabucks Stratus: Takes 25mm and 26mm cubes, but 27mm cubes can fit, hindering airflow, which can pose a health risk.
• – Alpaca Lipache / Provost: 25mm cubes for a foil-only setup. 26mm cubes can fit as well, but only two need to be used to prevent the lid from warping.
• – Kaloud Lotus II: 25mm and 26mm cubes fit as well. Lotus II actually has a deeper chamber for added convenience.
• – Quasar / other glass HMDs: Typically 22mm or 25mm cubes. Larger sizes can crack the chamber. Check the manufacturer’s guide.

While using smaller cubes, 25mm cubes provide users with the most compatibility. If your lounge has multiple different HMD models, keeping 25mm cubes ensures that all devices can be used. If your lounge only has deep-chamber HMDs, like the Lotus II or Stratus, then 26mm cubes can be used to ensure that longer sessions can take place.

Per-Session Cost Analysis: Understanding the Details

When comparing the cost of different coal sizes, it is not a matter of the coal’s cost per kilogram. It has more to do with the coal’s cost per session, how much coal is wasted, and how many sessions the coal supports.

If we look at the average price of coconut charcoal ($1.50–$2.50 per kilogram in bulk), we can see how the 22mm coal costs when broken down per session:

• – 22mm coal takes 3 cubes to do a session. Each kilogram supports 35–40 sessions, making the cost of each session ~$0.04–$0.07.
• – 25mm coal takes 3 cubes to do a session. Each kilogram supports 27–30 sessions, making the cost of each session ~$0.05–$0.08.
• – 26mm coal takes 3 cubes to do a session. Each kilogram supports 22–25 sessions, making the cost of each session ~$0.06–$0.10.
• – 27mm coal takes 3 cubes to do a session. Each kilogram supports 18–22 sessions, making the cost of each session ~$0.07–$0.12.

The price of the 22mm coal vs the price of the 27mm coal is ~$0.03. However, if a lounge does 200 sessions in a day, the cost of 27mm coal vs 22mm coal coal can be ~$15-$20 more a day ($5,000–$7,000 a year). These numbers matter when purchasing bulk coal for lounges.

However, this calculation also assumes that the session duration is the same across different coal sizes. For example, a 27mm cube session lasts almost twice as long as a 22mm cube session before it requires a re-light. If your lounge operates on 90-minute sessions, three 27mm cubes may be needed because one set lasts the entire session, while 22mm cubes require a full second round. socles de narguiléd on that scenario, the cost of 22mm cubes for your session doubles because you are using six cubes instead of three. It is important to determine the cost of coal for a session duration rather than for a single placement of coal.

How to Choose Your Primary Coal Size

For the majority of the commercial setups, the primary size should be used for the majority of sessions, while the secondary size can be used for the rest.

Guideline based on your lounge profile:

• – Standard lounge with different bowl sizes: Use 25mm cubes as a primary size and 22mm cubes for smaller bowls. This should take care of 80-85% of your sessions and only requires one coal placement at the 45-50 minute mark.
• – Long session lounge (90 minutes or more): 26mm as the primary with 25mm as backup. One round of 26mm cubes can push to 65 minutes meaning no mid-session coal changes.
• – Outdoor or high-airflow venue: Use 27mm or 26mm cubes as the primary size. Heavy wind cooling which reduces effective heat requires larger cubes to compensate. Monitor your tobacco closely to see if it’s burning.
• – High-volume quick session lounges (30-45 minutes): 22mm as primary. These are optimized for fast coal placement, lower coal cost, and minimal waste. Use 25mm for the longer sessions.

Lounge with a standard HMD fleet (mixed models): the 25mm model. It offers the safest choice in compatibility and the highest tolerance of the variation in HMD design.

Storing and Handling Bulk Coal

There are some efficiencies to be gained if proper storage methods are applied when buying hookah charcoal cubes in bulk for your lounge.

Key storage methods to remember include:

• – Keep the charcoal stored in a dry place. Unlike other types of charcoal, exposure to humidity diminishes the performance of coconut charcoal. They take longer to light and produce less heat. Absorbing even the slight bit of moisture can affect the coal’s burning curve.
• – The charcoal should not be stacked directly on the concrete floor. Concrete wicks moisture even in controlled atmospheric spaces. Utilize thin pallets or shelves to store cartons.
• – If you purchase charcoal of more than one size, organize stock of different size units so the stock of smaller size units is placed in front of the stock of the larger size units. When stored properly, charcoal of all sizes has no expiration date, but if charcoal is stored in a humid environment for over 12 months, its performance is affected.
• – If you receive coal cartons with broken cubes, document the claim. Larger cubes (26mm, 27mm) are more likely to be broken during transport, and receipts for claims should be made for any coal cartons with breakage rates of over 10 – 15 percent.
• – Some lounges pre-pack cubes in portions of three cubes per bag or tray so that they can quickly serve clients and ensure that each client gets the same quantity of charcoal per session.

Product Spotlight: Reliable Charcoal Supply for Your Lounge

Now that we have covered the technical aspects of charcoal sizes, we can consider the most practical question: where do you buy a bulk amount of good quality hookah charcoal cubes?

For the commercially used, standard 25mm cube supply, Linkup Hookah provides a reliable, bulk, coconut charcoal supply. The 25mm size comes in wholesale cartons for the multi-lounge operations. From the many options available in their online shop, you can look at .

For lounges that utilize HMDs for coal fitment, the right tools make a notable difference in the everyday operation of your lounge. Quality stainless steel tongs minimize cube breakage during placement and rotation. You can see the options available at .

If your lounge is standardizing on a foil-heavy workflow with small bowls, the right bowl selection is just as critical as the coal. Traditional phunnel bowl options pair well with 22mm and 25mm cubes. To see the options available, you can check out .

The Bottom Line on Charcoal Size Selection

The German lounge manager who moved from using 26mm cubes for everything to a two-size syhookah stems saved more than just money. His staff complained of less in-session issues, he experienced a 25% decrease in coal waste, and his customers appreciated the improved quality of his sessions. No other single supply chain change had as large, daily, operational related affects as the correct choice of charcoal size to match the bowl.

The sizes examined here — 22mm, 25mm, 26mm, and 27mm — all have distinct roles in the commercial hookah world. They should not be viewed as interchangeable sizes. Each is designed for specific bowl shapes, session lengths, and heat management designs. They are precision instruments.

For most lounges, the most practical approach is to have a primary size, which is usually 25mm, and a secondary size to cover the rest. When sourcing bulk hookah charcoal, purchase your main size in bulk and your secondary size in smaller amounts. Before buying a full pallet of a new size, purchase a trial carton. Perform a series of controlled sessions to compare sizes utilizing the same bowls and HMDs.

The additional effort to find the most suitable coal size will add up to savings on coal, improved staff efficiency, and overall improvement of session quality as less product is wasted. In an industry where the product is smoke, choosing the right size of coal is a very significant and essential choice.