The aim of this paper is to present various types of research on reducing emissions in the flue gases produced by low-power biomass boilers, especially when the boilers operate outside their nominal operating regime. This long-term investigation program is being carried out on a pilot boiler in the university laboratories. The program involves acquiring additional instrumentation for performing and evaluating present and future experiments, creating various types of models of the boiler for designing and testing the control algorithms using available data, and implementing and evaluating the algorithms in real operation. The pilot device enables us to experiment using non-standard instrumentation, but throughout our research it is necessary to strike a balance between ecological policy requirements and economic considerations.