Flat shisha coals: when HMD-focused markets need them

By Mohamad Sinno, Charcoal Expert · 28 August 2026

Ask four sources how tall a flat coal is and you will get two different answers, twice each, and none of them will mention that the others disagree.

The short answer

A flat is a cube that has been made shorter: same 25 mm footprint, less height, so it sits lower under a device and puts less weight on foil. Ours are 25×25×15, 25×25×17 mm — both heights, on the same footprint — and the piece count for either is quoted against the size you order. Stock them where your buyers use heat-management devices or want a shallower heat bed than a cube gives — and read the next section before you write a dimension into a purchase order.

Flats are not one size

The footprint is settled — everybody says 25 mm by 25 mm. The height is not, and the disagreement is sitting in plain sight across the first page of results with nobody naming it.

Two millimetres on a 25 mm square is roughly a tenth of the piece by volume, which is enough to move the piece count in a retail box and enough to change how a coal seats in a device with tight clearance. We are not going to tell you which of the two is correct, because both are correct — for the product that source is describing. "Flat" is a shape name, not a specification. If a dimension matters to your device or your box copy, it belongs in the purchase order rather than assumed from the category.

Our own record sits beside those two columns rather than inside them, because it is a different kind of statement: the rows above report what four sources publish, and this is what our factory cuts. We produce flats at both heights — 25×25×15, 25×25×17 mm, on the one 25 × 25 footprint. So the disagreement in the table is not a disagreement we have to resolve before quoting you; it is two real products, and we make them both. What still has to be resolved is which one your device or your box wants, and that belongs in the purchase order rather than inferred from whichever page a buyer read first.

The device question, honestly

Flats and heat-management devices get named together so often that the pairing reads as settled. It is not quite. One retailer blog puts the mechanical case plainly: flats "don't weight as much, so there is less pressure on the foil", which makes them forgiving on a standard foil setup. A supplier guide dated October 2025 routes the 25 × 25 × 15 flat specifically to Kaloud Lotus devices.

But a Europe-facing buying guide says the opposite thing about the same pairing: those coals are "most suited for work on aluminium foil", and while they can work with a device such as the Kaloud Lotus, they "will likely have most of their heat output absorbed by the device due to their relatively small size and heat surface cover". That is a real disagreement about the flagship use case, and a distributor deciding what to stock is better off knowing it exists than being sold the tidy version. Where it lands probably depends on which device and how many pieces — neither of which any of these sources holds constant.

What we will not do is settle it with a number of our own. There is no burn test on file here, and the reasoning is set out on our quality page: a heat or burn figure without its bowl, airflow and device conditions cannot be compared between two suppliers, so publishing one would look like evidence without being any.

Ordering flats in a mixed container

Flats cost you container weight, and this is the figure the retail explainers have no reason to carry. A 20 ft loads 18.5 tonnes of flat, hexagonal, stix or octagonal against 20 tonnes of 25 or 26 mm cube — the same 10 kg master carton either way, but 1,850 cartons instead of 2,000. A 40 ft is 26.5 tonnes for every shape we make, because the larger box fills by weight while the 20 ft fills by volume.

So a mixed container is priced by what you put in it, and the practical move is to let the cube volume carry the load while the flats ride as the device-market line. Minimum order is one full container and shapes can be mixed inside it, which means flats do not have to be a standalone bet. The full shape-by-shape loading table is on payload by shape; the count arithmetic is on pieces per kilogram; and if your market runs long formats instead, those are on hexagonal and finger. Flats against every other shape, and what choosing one instead of another costs by the tonne, are compared in the shapes and sizes catalogue.