Ключевые слова:
Gas-powered devices, Hot-water boilers, Boilers, Domestic, Heating equipment, Central heating, Hot-water central heating, Gas space heating, Classification systems, Grades (quality), Performance, Marking, Design, Instructions for use, 1st family gases, 2nd family gases, 3rd family gases, Control systems, Safety valves, Gas valves, Safety devices, Control devices, Temperature controllers, Pressure regulators, Temperature-rise limit, Combustion products, Thermal efficiency, Thermal insulation, Gas pipes, Pipe fittings, Ignition systems (heat engineering), Thickness, Welded joints, Flues, Pressure, Type testing, Performance testing, Endurance testing, Hydraulic tests, Leak tests, Test equipment, Test pressure, Testing conditions, Steels, Cast-iron, Aluminium, Copper, Strength of materials