Specification for welded steel boilers for central heating and indirect hot water supply (rated output 44 kW to 3 MW)|Temperature, Heating equipment, Dished ends, Pipe connections, Automatic control systems, Thermal output, Boilers, Indirect hot-water supply, Equations, Welding, Steels, Stress, Cylindrical shape, Pipes, Hot-water central heating, Test pressure, Seatings, Classification systems, Holes, Installation, Ratings, Safety measures, Boiler stays, Inspection, Hot-water supply systems, Hot-water boilers, Marking, Thickness, Electrical installations, Design, Steam boilers, Stiffeners, Dimensions, Fire-tube boilers