Wood pellet boilers function much like fossil fuel boilers. When heat is required, they automatically ignite, feed fuel to the fire, and switch off as required. Their automated nature make them an excellent alternative for those looking for a more cost effective and environmentally friendly alternative to traditional oil, LPG, or electrical heating, whilst maintaining the highest comfort levels. They are suitable for all sized applications, from small domestic properties, right through to large commercial applications. When choosing a wood pellet boiler, there are several important points to consider such as fuel storage, energy storage and control.
Benefits of a pellet burning boiler;
Smaller domestic properties and light commercial installations
K Series Mk2
The K Series Mk2 range of pellet boilers are ideally suited to domestic properties or light commercial. Purpose designed for simple and easy operation both when fuelling with wood pellets or removing ash. As a guide the K Series Mk2 pellet boilers might suit:
K10 Very well insulated modern house 2-3 bedrooms or more if of passive type construction. Older 1-2 bedroom property.
K15 Very well insulated modern house 3-4 bedrooms or more if passive type construction. Older 2-3 bedroom property.
K21 Well insulated 3-5 bedroom property. Poor insulated 2-3 bedroom. Small low energy commercial application such as high street shop.
K26 Well insulated 4-6 bedroom house. Poor insulated 3-4 bedroom. Small low energy commercial, larger shop or small warehouse.
Compact 25-50 range
Commercially constructed pellet boiler for domestic applications As a guide the Compact 25-50 range of pellet boilers might suit:
Compact 25 Well insulated 4-6 bedroom house with larger than average hot water demand and/or swimming pool. Small to medium commercial application.
Compact 35 as Compact 55, though larger all round application.
Compact 45 and 50 Medium to large country property or large urban house. Small school or rest home, manufacturing process with heat requirement or space heating.
Larger domestic properties, commercial and industrial installations
Compact 65-80 range
Commercially constructed pellet boiler designed for domestic and commercial applications. As a guide the Compact 65-80 range of pellet boilers are ideally suited for:
Compact 65 Medium to large country property or large urban house. Small school, rest home, manufacturing process with heat requirement or space heating.
Compact 80 Large country property or large urban house. Medium rural primary school, rest home, manufacturing process with heat requirement or space heating.
Commercially constructed pellet boiler for heavy load applications with continuous long operation periods or regular stop and start applications.
Large country or urban houses. Medium to large hotels, rest homes and medical care. Large shop or showroom properties, such car, supermarket, shopping centres or out of town stores. Process applications such as wood fuel drying, food, animal, chicken production.
M Series 350-400
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, such car, supermarket, shopping centres and out of town stores.
District heating of housing estates, industrial complexes, etc.
Pellet storage can either be incorporated locally within the boiler, or via a bulk pellet store that is either augered or vacuum transferred to the boiler. Pellets are available in pre-packed bags (normally 15 kg) for ease of handling and convenience, or bulk delivered for those looking for extended periods between refuelling and optimum buying price.
Buffer tanks, or thermal stores, are crucial for the efficient operation of all biomass boilers The benefits gained from using an accumulator are substantial. Not only do they reduce fuel consumption they allow accumulated energy to be available immediately, there is no need to light the boiler. This reduces emissions and increases the life span of the boiler. In addition the buffer tank or thermal store allow multiple heat sources to be linked as well as offering your central heating system access to heated hot water
Rather than simply controlling the heating of the buffer tank, the onboard controller of both the HDG and SHT pellet boilers can be used to control the entire heating and hot water system with weather compensation. Weather compensation control adjusts the temperature in the heating system according to the temperature outside and has been shown to give savings in fuel costs.
As with all high efficiency biomass boilers, pellet boilers require clever electronic controllers to ensure the highest efficiencies possible. Typically, pellets are ignited in a combustion chamber where the volatile gases are driven off and gassified by adding secondary air. The controller ensures the precise mix of fuel, primary air, and secondary air at all stages of combustion.
HDG's 10-33kW mid-sized pellet boiler range. Ideal for the larger home or business due to its relatively compact design. Integrated fuel storage or vacuum delivery from a bulk storage facility. Option of 7" touch screen with remote access from mobile, PC, laptop and i-pad.