The company "Kamini Eurostandart LTD" manufactures Bulgarian combined combustion chambers for the incorporation of wood, wood briquettes and wooden pellets from 7 to 20 kW, complying with the requirements of the European Union (BDS EN 13229). Room heater "DIA 20 pellets" has results meeting the requirements of Regulation (EU) 2015/1185 and the ELV requirements of BImSchV-norm. Pellet pellet DIA 20 pellets has an energy efficiency class (Class A +) of Regulation (EC) 2015/1186. The combined combustion chamber is designed and manufactured in accordance with the latest state-of-the-art biomass heating concepts that are environmentally friendly. Provides coziness and warmth with minimal service time. The fuel process runs completely automated without the need for constant supervision and refueling. An eco-friendly, high efficiency and efficiency ratio with low levels of commitment and serviceability. The management and maintenance of the combustion process is done by means of a built-in microcomputer system through a large Led display in Bulgarian language, powered by the electric grid and consuming insignificant amount of electricity. Fuel: The main fuel used by the fireplace is pellets, wood, wood briquettes, but also dry stones, as well as dried corn can also be used. Pots and maize can be burned in small relative amounts up to a maximum of 15% of the mass of the primary fuel and necessarily mixed with it.