Diameter isn't a quality marker — it's a compatibility question. Here's how to know which one your appliance actually needs.
Diameter is one of the most misunderstood wood pellet specs. It's not a quality indicator — a 6mm pellet isn't "finer" or "better" than an 8mm one. It's purely a compatibility question between the pellet and the feed mechanism of your stove or boiler.
6mm is the more common diameter across Europe, used by the majority of residential pellet stoves and small-to-mid-sized boilers. If you're supplying a general residential market without knowing every customer's exact appliance, 6mm is the safer default to stock — it's what most auger-fed systems in Europe are built around.
8mm is less common at the residential level but standard for many industrial and larger commercial boilers, where a larger pellet suits a higher-throughput feed system. Some appliances are designed to run either diameter, but many are not — feeding the wrong size into a narrow auger can jam the mechanism entirely.
The rule that matters more than either number: check the appliance manual before ordering, every time, especially for a customer or order you haven't supplied before. Both diameters are available across our ENplus A1, ENplus A2 and industrial lines — tell us which diameter you need when requesting a quote, and we'll confirm availability for that specific size and grade combination.
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