Descriptors | Water heaters, Instantaneous water heaters, Gas-powered devices, 2nd family gases, 3rd family gases, Hot-water supply systems, Definitions, Conversion, Symbols, Gas circuits, Gas pipes, Pipes, Water, Safety engineering, Draw-off taps, Pilot flames, Electrical equipment, Thermal output, Performance testing, Temperature, Combustion, Thermal efficiency, Specimen preparation, Gases, Calorific value, Relative density, Classification systems, Testing conditions, Test pressure, Installation, Water supply, Accuracy, Temperature measurement, Leak tests, Combustion test methods, Combustion products, Instructions for use, Marking, Heating tests, Ignition, Fire safety, Flames, Stability, Heaters, Test equipment, Temperature rise, Thermostats, Thermal testing |