Fuzzy LogicWood Pellet Boilers

These can be considered the most popular form of domestic wood boiler as they are fully automatic in operation. Fuel handling is convenient and requires a relatively small storage volume due to the high energy density of the pellets. Storage can be adjacent to the boiler itself or in separate fuel store. In both cases a feeding mechanism (screw/auger) is used to transport the pellets from the store to the boiler. Pellet boilers are generally lit automatically and continue to operate without manual intervention. Higher spec boilers are self-cleaning so you can forget the cleaning chore of traditional solid fuel heating systems. Some pellet boilers can also operate using corn which is similar in shape and has a similar energy content.

Wood log boilers

Modern log boilers also have very high efficiencies. These are not generally as convenient in use as the fuel logs normally need to be loaded manually. However, a certain amount of storage in an integral chamber limits the frequency with which reloading of logs is required. Log systems work best where heat is required over longer periods of time as the boilers are not as suited to frequent start up and shut down sequences. Some systems use a large hot water storage tank or buffer in order that the boiler can be lit once, the heat stored and subsequently used over a number of days, before the boiler needs to be restarted. Log boilers can be an advantage where you have your own supply of wood as the running costs can be very low while providing you with a degree of self-sufficiency. Gasification boilers maximise fuel efficiency to achieve, as close as possible, complete combustion of any fuel. Wood log gasification boilers are now commonly available in the Irish marketplace.

Wood chip boilers

These are essentially the same as wood pellet boilers. The main difference is the feeding mechanism. A stirrer is required in the store to ensure a constant supply of wood chips as they are not as uniform in terms of shape and tend to form bridges unless a mechanism is in place to prevent this. The storage volume also needs to be larger than for chips because the energy density is less than for that of pellets. Chip boilers are generally lit automatically and continue to operate without manual intervention. Higher specification boilers are self-cleaning so you can forget the cleaning chore of traditional solid fuel heating systems.

Operation and maintenance

Wood boilers operate just like a conventional central heating system and work in conjunction with radiators or under-floor heating. You can control the heating system and regulate the temperature from a panel control. Most reputable boiler suppliers offer service contracts to ensure an optimum operation and long life of the boiler. Many boilers have an automatic system alarm that is sent to a service engineer via SMS messaging on a mobile phone. Quality boiler suppliers report very low failure rates and most problems are solved within minutes, remotely without callout.
S operate just like a conventional central heating system and work in conjunction with radiators or under-floor heating. You can control the heating system and regulate the temperature from a panel control. Most reputable boiler suppliers offer service contracts to ensure an optimum operation and long life of the boiler. Many boilers have an automatic system alarm that is sent to a service engineer via SMS messaging on a mobile phone. Quality boiler suppliers report very low failure rates and most problems are solved within minutes, remotely without callout.