Buying wood pellets by the pallet is not the same job as buying a bag for a stove at home. A wholesaler, distributor or commercial heating business is committing to a product that has to burn consistently across a whole season, survive several handling steps without falling apart, and arrive at a predictable moisture content. Get the specification wrong and the complaints arrive months later, from customers who have already paid.
This guide sets out what the figures on a pellet specification actually mean, where the real differences between quality classes lie, and what to ask a supplier before placing a first order.
What wood pellets are, and how they are made
Wood pellets are a densified solid fuel. Sawdust, shavings and other clean by-products of timber processing are dried to a controlled moisture content, milled to a uniform particle size, then forced under high pressure through a die that extrudes them as cylinders. The pressure raises the temperature enough to soften the lignin naturally present in the wood, and the lignin sets as the pellet cools — which is why a well-made pellet needs no glue or binding agent to hold together.
Two things follow from that process, and both matter commercially. First, the raw material determines the ash content: clean stemwood leaves very little residue, while bark and recovered wood leave considerably more. Second, the pressing determines how well the pellet survives transport. A pellet pressed at the wrong moisture or temperature will hold its shape in the bag and crumble by the time it reaches the burner.
ENplus A1 and ENplus A2: what actually differs
ENplus is the certification scheme most European buyers work to. It audits the whole chain — production, trading, bagging — rather than testing a single batch, which is why a certificate number is worth more than a laboratory report on its own. We explain the scheme in more detail on our certifications page.
The classes differ less than buyers often assume, and the differences that exist are concentrated in a few properties:
| Property | ENplus A1 | ENplus A2 |
|---|---|---|
| Ash content | ≤ 0.7% | ≤ 1.2% |
| Moisture | ≤ 10% | ≤ 10% |
| Net calorific value | ≥ 16.5 MJ/kg | ≥ 16.5 MJ/kg |
| Mechanical durability | ≥ 98.0% | ≥ 97.5% |
| Typical raw material | Clean stemwood | May include bark |
The headline difference is ash. A1 permits roughly half the ash of A2. For a domestic stove emptied by the end user, that is the difference between a weekly and a fortnightly chore. For a commercial boiler with automatic de-ashing, it is a question of maintenance intervals and how often the heat exchanger needs cleaning.
Note what does not differ: the energy content. A1 and A2 carry the same minimum calorific value. An A2 pellet is not a weaker fuel — it simply leaves more behind. Class B, the third tier, permits up to 2.0% ash and a wider range of raw materials, and is intended for industrial installations designed for it.
The specifications that matter
Diameter and length. Six millimetres is the European norm and what most appliances are built around; 8 mm exists for larger installations. Length is specified as 3.15–40 mm. Oversized pellets jam augers, and that is a service call rather than a quality complaint.
Moisture. Capped at 10% for both A1 and A2. Below that is better: water in the fuel is energy spent boiling it off rather than heating a building. Moisture is also the figure most easily ruined after dispatch, which makes storage conditions as important as the mill’s output.
Ash. The property that most affects the end user’s experience, and the one that separates the classes. Ask for the figure on a dry basis and check whether it is a typical value or a guaranteed maximum — they are not the same commitment.
Calorific value. Published either in MJ/kg or kWh/kg. The conversion is straightforward: 16.5 MJ/kg is about 4.58 kWh/kg. Be alert to non-standard units on a specification sheet, because they make comparison between suppliers harder than it should be, and occasionally that is the point.
Mechanical durability and fines. Durability measures how much of a sample survives a tumbling test intact — 98% for A1. Fines are the dust that has already broken off. Both predict how the product will arrive after being palletised, trucked, cross-docked and stacked. A pellet that tests well at the mill and arrives as 5% dust is not a bargain.
How quality shows up in the boiler room
The specification translates into operating cost in three ways. High ash means more frequent cleaning and faster fouling of heat exchange surfaces. High fines mean dust in the feed system, inconsistent dosing and more incomplete combustion. High moisture means a measurable share of the fuel’s energy is spent evaporating water before any heat reaches the building.
None of this is visible in a bag. It appears two months into the heating season, which is why the specification is worth reading before the order rather than after the complaint.
Packaging, pallets and buying in volume
Bagged pellets are the standard format for the wholesale and retail trade. The usual unit is a 15 kg bag, shrink-wrapped onto a pallet. Pallet weights vary by producer, and the variation is not trivial when you are costing a truckload:
- 65 bags × 15 kg = 975 kg per pallet, as on Heizfuxx Holzpellets BLUE
- 50 bags × 15 kg = 750 kg per pallet, as on ScandiWarm Economy
Always confirm bag count, pallet weight and pallet type before quoting. A 30% difference in pallet weight changes how many pallets fit a load and what the delivered cost per tonne actually is.
Storing and moving pellets without losing quality
Pellets are hygroscopic: they absorb moisture from the air, and a pellet that has taken on water swells, loses durability and crumbles. The practical rules are simple and rarely followed completely.
Store under cover, off the ground on pallets, away from exterior walls that sweat. Keep the shrink-wrap intact until the point of sale — it is a moisture barrier, not just a handling aid. Rotate stock so the oldest pallets leave first. Avoid repeated re-stacking, since every handling step generates fines. And do not store pellets alongside anything with a strong odour; they will take it on.
Choosing a wholesale supplier
A few questions separate a serious supplier from a reseller working off a price list:
- Will they show you the full specification for each product, not a summary? Every figure should be available before you order.
- Do they state the certification class honestly, including where there isn’t one? A catalogue where every product is described as ENplus A1 deserves a second look.
- Can they identify the producer behind each brand?
- Are packaging and pallet configuration stated precisely?
- Is the company verifiable? A registration number you can check in a public register is a basic test any legitimate business passes.
How Premium Bio Pellet works with wholesale customers
We distribute wood pellets; we do not manufacture them. Every pellet product in our catalogue is produced by a third party and supplied by us in bagged, palletised form. Our own registered manufacturing activity is sawn and planed wood, not pellet production. We think that distinction matters, because a distributor who claims to be a producer is already being imprecise about something easy to check.
That shapes how the catalogue is published. For every product we reproduce the manufacturer’s technical specification in full, exactly as supplied — including the certification class where one is declared. Of the seven products we currently list, five state ENplus A1 on their specification and two state no certification class at all. Those two are not hidden: their pages simply carry no quality-grade row, because their specifications declare none, and an economy grade is a legitimate product for buyers who want one.
Premium Bio Pellet Sp. z o.o. is registered in Poland under KRS 0000799838 with EU VAT number PL7773352779, both verifiable in the public registers. Our company page sets out the registration details in full.
Next step
Browse the wood pellet catalogue to compare the published specifications side by side, then request a quotation with the product, quantity and delivery location. We will come back with pricing and availability.