Pellets are a remarkably flexible fuel source; they can be delivered pneumatically to silos and fuel stores without direct access for tipping. They will flow out of a silo without the need for mechanical agitation, and have a far higher energy density than wood chips. The downside to all this convenience is the premium price. REKA boilers can deal with poor quality pellet products made from recycled materials (must be WID exempt). This means that the convenience of a wood pellet can be unlocked without paying the premium price.