Contact Us

01603 304306

Types of Biomass Boiler System

Firstly we should differentiate between a Boiler and a Stove:

Biomass Boilers can be used in place of a standard gas or oil boiler to heat radiators and to heat hot water. Biomass boilers are typically larger than the gas or oil or LPG boilers. Financially they are generally more suited f for homes on oil or LPG.

Stoves are used to heat a single room, usually in conjunction with other heating systems i.e. gas or electric radiator systems, but may also have a back boiler to provide hot water.

Wood burning stoves are suitable for heating any room providing there is a chimney or a flue. They come in different shapes and sizes, and can burn logs, or wood pellets. The wood pellet stoves tend to be cleaner and easier to maintain, producing much less ash.

If you are in a smokeless zone you will need to check the appliance before you buy. Some stoves burn wood so cleanly that they are certified for use in smokeless zones.

Types of Biomass Boiler

There are essentially three different types domestic and commercial biomass boilers:

LogsLogs are typically fast grown locally sourced quick drying sustainable timber. However to ensure that your boiler is efficient it important to get the moisture content of the logs right; ideally logs will have a moisture content of less than 25 per cent or they simply do not output sufficient heat and will create smoke and tar within the boiler.


PelletsWood Pellets are typically made from compressed sawdust, wood shavings, and other biomass products and are nearly perfectly uniform in shape and size. They have higher energy content and as such take up less storage space than logs and wood chips. Wood pellet biomass boiler systems are the smallest, neatest and most like a mainstream boiler and require the least input from the user.


Wood ChipWood Chips are the least expensive and most abundant of the three materials for biomass boilers. They allow for more mechanisation than logs, but are not as efficient as wood pellets. It’s very important that they near to the same size to ensure that they work smoothly in an automated boiler feeder system.

Wood chips and wood pellets can be used in automated feeder systems using a hopper storage bin whereas logs must be manually fed into the boiler.


A hopper is simply a storage bin that feeds the boiler on demand. If you don’t have a hopper, you will have to load bags of pellet or wood chip manually into the boiler. How frequently you do this depends on the size of your biomass system.

Wood chips and wood pellets can be used in automated feeder systems using a hopper storage bin whereas logs must be manually fed into the boiler.

Typically a large hopper will feed wood chips or pellets to the boiler. The hopper can be as big or as small as the space you have available next to the biomass boiler. Naturally the larger the hopper, the less transport and delivery fuel costs and work for the owner.

Alternatively, log fed boilers are more suitable for people with access to a supply of wood, and time to cut it to the right size. These require much more time to feed them with fuel and to clean out the vast amounts of ash.

EEA Regional Award winner EEA National Award winner EEA National Boiler Award winner MCS Elecsa REC FGAS BPEC Green Deal