Moisture content
Moisture content affects usable energy, combustion behaviour and fuel handling. A controlled moisture specification supports more predictable boiler operation.
Fuel quality & specification
Fuel quality is the foundation of reliable renewable heat.
Every biomass boiler depends on consistent fuel. Moisture content, particle size, contamination and storage all influence how reliably a commercial biomass system performs.
Commercial boiler fuel
Commercial fuel is not just wood chip.
To the eye, two loads of wood chip may appear similar. In a biomass boiler, they can perform very differently. Commercial fuel quality is determined by interacting characteristics including moisture content, particle size, particle consistency, contamination, ash content, storage and handling.
Quality factors
What reliable fuel depends on.
Particle size
Fuel that is too coarse, too fine or inconsistent can affect feeding systems, bridge in stores or create operational issues.
Consistency
A commercial boiler performs best when each delivery is predictable. Consistency supports efficient operation and simpler maintenance planning.
Contamination
Stone, soil, metal, oversized material and unsuitable fines can cause avoidable wear, blockages and downtime.
Storage
Fuel quality does not end at delivery. Ventilation, drainage, stock rotation and fuel-store design all influence how biomass performs before it reaches the boiler.
Moisture content
Moisture content matters.
Higher moisture reduces usable energy per tonne and can make combustion and handling less predictable. The right moisture level depends on the boiler and system design, but commercial users generally need a fuel supply that is managed, not guessed.
Our standard commercial product is dry G30 wood chip, generally supplied at approximately 25% moisture content, subject to customer requirements and agreed specification.
Particle size
Particle size must suit the boiler.
Every boiler and fuel-feed system has an acceptable fuel grade. Fuel that is too coarse may bridge in stores or feed systems. Excessive fines can affect combustion behaviour and increase dust.
Process
Quality is built into the process.
Quality cannot be inspected into fuel at the final stage. It has to be managed throughout sourcing, processing, drying, handling, storage and delivery.
Suitable raw material
Careful handling
Storage management
Routine quality assessment
Certification
Certified wood fuel supply.
McCauley Wood Fuels is a WFQA certified wood fuel supplier. Certification supports a disciplined approach to fuel specification, consistency and recognised wood fuel standards.
Correct specification
The right fuel for the right boiler.
Every biomass installation is different. Before agreeing supply, McCauley Wood Fuels considers the boiler manufacturer, boiler output, fuel-feed system, storage arrangement, annual consumption, seasonal demand and delivery access.
Supply the right fuel for the right boiler.
FAQ
Fuel quality FAQs.
What does G30 mean?
G30 refers to a recognised wood-chip particle-size classification commonly used for commercial biomass systems.
What moisture content should commercial wood chip have?
There is no single correct figure for every boiler. Many commercial systems perform well with fuel around 25% moisture content, but the correct specification depends on the equipment and operating conditions.
Does drier always mean better?
Not necessarily. Consistency and suitability for the boiler are generally more important than pursuing the lowest possible moisture content.
Why does fuel quality affect maintenance?
Poor-quality or inconsistent fuel can increase wear, feeding problems, combustion instability and cleaning requirements.
Can you advise on the correct fuel specification?
Yes. McCauley Wood Fuels can discuss your boiler, fuel-handling system and operating requirements before recommending an appropriate commercial fuel specification.
Fuel specification
Reliable heat starts with reliable fuel.
If you are reviewing an existing fuel supplier, commissioning a new biomass boiler or want confidence that your current specification is appropriate, speak with McCauley Wood Fuels.