Real life performance of domestic pellet boiler technologies as a function of operational loads: A case study of Belgium

► We studied performance of three different wood pellet boiler technologies in real life conditions. ► The measurements comprised of carbon monoxide (CO), nitrogen oxide (NOx), dust and combustion efficiency. ► Emissions and efficiency at nominal load were compared with that at reduced load. ► All boilers were fuelled with DINplus certified wood pellets. ► Different burner configurations lead to important differences in emissions and efficiencies at different operational loads.