| Descriptors | Gas space heating, Fan-assisted warm-air heating, Warm-air heating, Central heating, Air heaters, Domestic, Heaters, Gas-powered devices, Classification systems, Ducting, Performance testing, Design, Leak tests, Heat, Combustion, Ignition, Ignition systems (heat engineering), Pilot flames, Flames, Fire safety in buildings, Fire risks, Heat exchangers, Control systems, Automatic control systems, Manual control systems, Temperature control, Safety devices, Installation, Marking, Temperature-rise limit, Test equipment, Fire safety, Domestic safety, Testing conditions, Performance, Flues, Instructions for use, Maintenance, Combustion products |