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Wood Chip Boilers
Wood Pellet Boilers
Domestic Back Boilers
Gas and oil fired boilers burn fossil fuels releasing CO2 into the atmosphere. Biomass boilers however, are more efficient, cheaper to run and burn renewable fuel in the form of logs, chip or pellets. Unlike some renewable energy technologies there is an ongoing fuel cost with biomass heating.
Who are they for?
The financial benefits of biomass boilers are undeniable. Fuel is delivered in bulk, typically between 5-20 tonnes per delivery. Due to the fuel storage space requirements, biomass boilers are more suited to commercial properties, shared heating systems and larger domestic property installations but there are systems more suitable for typical domestic installations.
Biomass technically refers to biological material, such as wood, grain, straw and bio-diesel. However, the term is used more generally to refer specifically to 'woody biomass' like wood chip, pellets or logs. Biomass fuels can be used for:
'heat only' applications such as providing space and water heating
combined heat and power (CHP)
Biomass fuel is often referred to as 'carbon-neutral' because it releases the same amount of carbon into the atmosphere during combustion as it uses whilst growing. Although some carbon is emitted during processing and transportation, it is mitigated by planting more trees and the net result is still significantly better than processing and transporting the alternatives.
At KM Renewable Energy we provide wood pellet, chip and log heating systems suitable for any size of commercial and domestic application.
Wood pellets are probably the most convenient and provide a compact fuel with automatic systems best suited to 10-200kW. Wood chip is suitable for more commercial applications from around 75kW upwards although units as small as 25 kW are available. Generally, logs boilers are best suited to relatively low demands (30-50kW) due to the amount of fuel handling required.
Biomass boilers use advanced microprocessors to control the amount of fuel and air being supplied to the combustion chamber to ensure complete combustion of the available fuel (including resins, tars and other combustibles normally expelled up the flue. This is part of the gasification process, and ensures extremely high combustion efficiencies (gross efficiency up to 95%) and ultra-low emissions. Good quality fuels help greatly with the combustion process.
Note: the gross efficiency tells you how complete the burning of the fuel is. Some are more efficient at transferring this energy into your heating system.
Automatic chip or pellet feed hoppers are usually incorporated along with heat storage systems such as accumulators, buffers and thermal stores and are self-monitoring to maintain efficiency.
Higher specification pellet and chip boilers can modulate their output between 30-100%, generally removing the need for a buffer tank unless there is a wide fluctuation in demand. Domestic pellet boilers do not usually require buffers. Log boilers always require buffers and higher specification boilers can modulate between 50-100% and are usually batch loaded daily.
Weather compensation controls enable this modulation so the system heats your property in line with the prevailing weather conditions. This optimised heating output results in fuel savings of around 20%.
Boilers are simple in design, require little maintenance and those made with high grade steel will last for 25 years or more.
Renewable Heat Incentive (RHI) and the Renewable Heat Premium Payments (RHPP) apply to this technology. RHI could more than cover the capital cost of even a complex system. For more information on funding please click here.
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