New technologies resp. components for logwood stoves which shall lead to significant emission reductions and efficiency gains have been developed and tested. BIOS focused on the development and optimisation of a new next generation logwood stove technology which is equipped with an automatic control system and shows due to the utilisation of primary and secondary (integrated high temperature catalyst) emission reduction measures very low emissions as well as due to an integrated heat storage based on phase-change-material an efficiency of more than 90%.