Ключевые слова:
Gas-powered devices, Gas space heating, Heaters, Gas-fired heaters, Domestic, Domestic safety, Safety measures, Household equipment, Efficiency, Radiant heaters, Convection heaters, 2nd family gases, 3rd family gases, Classification systems, Thermal output, Flued heaters, Performance testing, Type testing, Fire tests, Thermal-cycling tests, Leak tests, Pressure testing