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Biomass is the general term given to combustible organic material harvested and burnt to create energy.
Burning wood is carbon neutral since the CO2 released when burning is equal to the CO2 absorbed during growth,as long as the wood comes from a source where new trees are planted to replace those that are harvested. The most common are, wood logs, wood chips and pellets.
How does it work?
Wood or Pellet Stoves (Stand Alone)
These are room heaters where the burning chamber is totally enclosed and creates a focal point for the room. They typically have an output of around 7 to 8kW or less and burn logs or pellets.
With an efficiency of up to 80% they offer a vast improvement on open fires that have an efficiency of less than 30%.
Wood and Pellet Boilers
Burning logs, wood chip or pellets boilers offer a complete central heating system via radiators and hot water. The boiler can be used to heat homes and large public buildings.
Pellets are made from sawdust and shavings from sawmills and area about 6-
Pellet boilers offer the convenience of an automatic feed from a hopper or large storage room. The small amount of ash left from burning is expelled into an ash drawer and can be easily accessed for emptying. Pellet boilers require annual cleaning and servicing as well as sweeping the flue.
Wood boilers require manual feeding on a regular basis with logs which can be up to 0.5m long. The function of the wood boiler is similar to the pellet boiler but without the automation.
What do I need to consider?
*Heat demand of the building
*Level of convenience required
*Availability of local supply of logs, wood chip or pellets
*Available storage space for wood fuel and proximity to boiler
*Practical and planning implications of the required flue
*You can't live in a smokeless zone
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