Descriptors | Hot-water boilers, Boilers, Gas-powered devices, Central heating, Hot-water central heating, Burners, Classification systems, Conversion, Thickness, Tensile strength, Yield strength, Elongation at fracture, Cast-iron, Aluminium, Aluminium alloys, Copper, Copper alloys, Design, Performance, Fire safety, Gas valves, Flow regulators, Ignition systems (heat engineering), Control devices, Thermostats, Leak tests, Performance testing, Temperature, Safety devices, Combustion products, Efficiency, Test pressure, Testing conditions, Endurance testing, Hydraulic tests, Marking, Instructions for use, Welded joints, Test equipment, Pressure testing |