ENplus A1 or DINplus pellets: what it changes for the appliance and after-sales
Published on 14 September 2026 · 5 min read
Both certifications guarantee a clean pellet. What matters for your customers: ash content, fines, length, storage. And why a bad bag generates more service calls than a bad setting.
Two certifications, one goal
ENplus A1 is the most widespread European certification; DINplus is the historic German certification. Both impose similar criteria on diameter (6 mm in Belgium), length, moisture (under 10%), ash content (under 0.7% for ENplus A1) and fines content. A certified bag, whatever the brand, suits every stove we distribute.
What makes the difference in use
- Ash content. The lower it is, the less the burn pot soots up. A pellet at 0.5% ash leaves half the residue of a pellet at 1%. On a stove without a self-cleaning burn pot, you see it every two days.
- Fines. The dust at the bottom of the bag builds up in the hopper and the auger, hampers feeding and can cause flame-outs. Advise emptying the hopper and vacuuming the bottom once a month.
- Length. Pellets that are too long (over 40 mm) sometimes jam the auger of small stoves. The certifications limit the proportion of long pellets.
- Moisture. A bag stored outside or in a damp garage swells and breaks up. Pellets must stay dry, on a pallet, protected from frost and condensation.
Why it is your problem
Half the calls for "the stove keeps going out" or "it makes a lot of ash" come from the pellets, not the appliance. A customer who switches to a non-certified batch, or one stored in the damp, calls their installer. A warning at the time of installation avoids a free call-out six months later.
What we advise telling the customer
- Choose pellets certified ENplus A1 or DINplus, 6 mm diameter, and stick with a brand that works well.
- Store them dry, do not put the bags on a cold floor, do not open the bag ahead of time.
- Empty and vacuum the hopper every month, clean the burn pot as per the manual (daily or weekly depending on the model).
- Have the annual service and the flue sweep done.
Appliances with self-regulating combustion (Leonardo on Edilkamin stoves) tolerate quality variations better; the bottom-fed Girolami stoves discharge the ash into a pan. Those are two arguments to use when the customer is hesitating between two ranges.