Cymraeg

Burning Pellets

Wood pellets can be used to produce heat in a specially designed stove or boiler. In addition, some existing solid fuel and oil boilers can be converted to make use of wood pellets.

Pellet Stoves

Pellet burning stoves were first introduced in the United States in the 1980's, with over half a million now installed.

Now available in the UK, pellet stoves have many of the advantages of fossil fuel heating systems but without the associated environmental damage. These include:

• Temperature and timer controls
• Fans that distribute warm air around the room
• Automatic ignition
• High efficiencies (up to 90%)

Pellet stoves feature a hopper to hold enough fuel for 1 to 3 days of operation and an ash pan that needs to be emptied no more than once a month to once a year (depending on the model and the frequency of use) so they are much more convenient to use than a traditional open fire or stove.

Pellet stoves look similar to traditional wood burning stoves but use modern microprocessor controls to ensure an efficient and clean burning fire. Because they use thermostatic controls and fans to distribute warm air around the room they are safer than traditional stoves, which rely on radiated heat to warm the room, making the room's temperature uneven and the body of the stove dangerously hot.

Pellet Boilers

Wood pellet boilers are fully automatic just like oil and gas boilers. Pellet boilers use advanced microprocessors to control the amount of fuel and air being supplied to the combustion chamber. This ensures extremely high efficiencies (up to 90%) and ultra-low emissions.

Heating with pellets is almost as convenient as using oil. No supervision of the equipment is required, although the pellet-burner will need cleaning about once a month. At the same time the ash must be removed, although the quantity is small as the pellets burn very efficiently.


Since they usually include automatic ignition, pellet boilers are well suited to meet variable load demands and can be operated on a timer.

Pellet burners may also be retrofitted to existing oil or coal boilers. This is common practice in Sweden and can be achieved with a few modifications to allow ash removal and some adjustment of the boiler output.

Since April 2001 wood combustion equipment has qualified for Enhanced Capital Allowances and a number of UK suppliers of pellet equipment have registered with the Inland Revenue so that customers can benefit from this allowance.

Desirable features:

• Small internal supply of pellets
• Automatic combustion control
• Approved safety equipment for fire and electrical safety
• Documented and approved environmental performance
• Easy maintenance and ash removal
• Clear instructions
• Average flue gas CO2 above 12% and CO below 0.1% (1000 ppm)
• Automatic starting with safety lock out to prevent auto restart after power failure (should be started manually)

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