Gas-fired central heating boilers - Type B boilers of nominal heat input exceeding 70 kW, but not exceeding 300 kW; German version EN 656:1999/A1:2006— 16 стр.
Heating systems in buildings - Method for calculation of system energy requirements and system efficiencies - Part 3-3: Domestic hot water systems, generation; German version EN 15316-3-3:2007— 33 стр.
Gas-fired central heating boilers - Type B boilers of nominal heat input exceeding 300 kW, but not exceeding 1000 kW; German version EN 13836:2006— 132 стр.