A biomass boiler flue is a specially designed flue system used to safely extract combustion gases from biomass heating systems such as wood pellet, wood chip, or log-fired boilers. Unlike traditional fossil fuel systems, biomass combustion produces moisture-rich, acidic exhaust gases, requiring flue systems that are highly resistant to corrosion and condensation.
These flue systems are typically constructed using high-grade stainless steel and are often supplied in twin-wall insulated configurations to maintain flue gas temperature. Proper insulation reduces the risk of condensation, which can lead to tar deposits and corrosion inside the flue. Access points for cleaning and maintenance are essential due to the particulate nature of biomass fuels.
Biomass boiler flue installations must comply with UK Building Regulations, local air quality requirements, and appliance manufacturer specifications. Key considerations include correct sizing for draught, safe termination above roof level, and the inclusion of condensate drainage. A well-designed biomass boiler flue system improves boiler efficiency, reduces emissions, and supports reliable long-term operation.
What Is a Biomass Boiler Flue?
A biomass boiler flue is a chimney or exhaust system designed to remove gases from wood-fuelled heating systems. It must handle moisture, soot, and acidic condensates produced during biomass combustion.
Materials and Design Features
Biomass flues are typically made from insulated stainless steel, with added corrosion resistance and cleaning access. Proper insulation helps prevent tar build-up and supports consistent draught and appliance performance.
Regulations and Best Practice
Flue systems must meet UK regulations for emissions and safety, including correct flue sizing, termination height, and condensate management. Regular maintenance access is also essential for safe and efficient operation.
