Heating systems in buildings - Method for calculation of system energy requirements and system efficiencies - Part 2-3: Space heating distribution systems; German version EN 15316-2-3:2007— 51 стр.
91.140.10 Central. Including burners and boilers for central heating systems / Системы центрального отопления. Включая горелки и котлы для систем центрального отопления
