Descriptors | Sampling methods, Symbols, Type testing, Hot-water central heating, Pressure testing, Temperature, Performance testing, Central heating, Aluminium alloys, Reports, Reproducibility, Heaters, Definitions, Thermal output, Cast-iron, Space-heating systems, Accuracy, Laboratory testing, Measuring instruments, Steam central heating, Convection heaters, Measurement, Steels, Dimensions, Radiators, Test equipment, Performance, Leak tests, Equations |