For radiator repair and balancing you need basic tools (bleed key, spanners, radiators valves — thermostatic and lockshield), replacement parts (valves, seals, possibly a new radiator), and equipment for circulation checks (pressure gauge, flow meter or simple thermometer). The job may also require a powerflush or chemical flush if sludge/blockages are present, system re-pressurising, and testing for leaks and proper flow. A qualified heating engineer is recommended for valve replacement, balancing adjustments, and any work involving the central heating system or boiler.