Wood chip boilers function much like fossil fuel boilers. When heat is required, they will automatically ignite, feed fuel to the fire, and switch off. Their automated nature make them an excellent alternative for those looking for a more cost effective and environmental friendly alternative to traditional oil, LPG, or electrical heating, whilst maintaining the highest comfort levels. Wood chip boilers are generally more suitable for larger domestic and commercial applications where the additional fuel savings compensate for the slightly higher capital cost and greater space and input required for fuel storage. Some models designed for wood chip can also burn wood pellets.
Benefits of a chip burning boiler;
Smaller domestic properties and light commercial installations
Compact 35-45-50-65-80 range
Commercially engineered wood chip boiler sized for domestic and commercial applications.
Well insulated 4-6 bedroom house with larger than average hot water demand and/or swimming pool. Small to medium commercial application.
Medium to large country property or large urban house. Small school or rest home, manufacturing process with heat requirement or space heating.
Medium to large country property or large urban house. Small school, rest space heating.
Large country property or large urban house. Medium rural primary school, rest home, manufacturing process with heat requirement or space heating.
Larger domestic properties and commercial installations
Compact 100-115-150-200 range
Commercially constructed wood chip boiler for heavy load applications with continuous long operation periods or regular stop and start applications.
As a guide the Compact 100-200 range of wood chip boilers might suit: Large country or urban houses. Medium to large hotels, rest homes and medical care.
Process applications such as wood fuel drying, food, animal, chicken production.
M Series 300-350-400-500 range
Industrially designed and built wood chip boiler for heavy work loads with nominal working hours of 4,000 hours per year.
Larger shopping centres or showroom properties, car, supermarket, shopping centres and out of town stores.
District heating of housing estates, industrial complexes.
Wood chip boilers require automatic combustion control to adjust to the varying nature of wood chip as a fuel. The most advanced and efficient boilers encompass a lambda sensor to adjust the primary and secondary air for the highest possible efficiencies. The controller ensures the precise mix of fuel, primary air, and secondary air at all stages of combustion to ensure efficiencies of up to 93%.
Wood chip boilers require larger fuel stores than the equivalent sized wood pellet system. Fuel stores should be sized so as to allow the boiler to run for a minimum of approximately 4 weeks in the coldest weather without the need to replenish the store. A number of methods can be used to fill the fuel store and are dependent upon individual sites and equipment available.
The HDG Compact and M Series range of wood chip boilers - modern, highly efficient, clean burning and totally automatic. Suitable for large domestic, commercial and industrial applications, these boilers from HDG are renowned for being the highest quality, most robust and dependable boilers on the market.
Buffer tanks, or thermal stores, are crucial for the efficient operation of all biomass boilers where the heat demand of property can drop below the minimum output of the boiler (typically 30%). Very few properties can guarantee a base load in excess of 30% and therefore buffer tanks should be used to avoid boiler cycling, decreased efficiency, increased electrical consumption, and increased maintenance intervals this causes.