Ключевые слова:
Hot-water boilers, Boilers, Gas-powered devices, Central heating, Hot-water central heating, Ratings, Marking, Classification systems, Mechanical properties of materials, Chemical composition, Unalloyed steels, Stainless steels, Tensile strength, Welded joints, Thickness, Design, Fire safety, Ignition systems (heat engineering), Safety devices, Control systems, Calorific value, Fitness for purpose, Testing conditions