A programmer or timer controls when heating runs. A room thermostat controls the temperature at which the boiler stops asking for heat. Thermostatic radiator valves help balance temperatures between rooms. They work together rather than replacing one another.\n\nStart with a schedule that matches when the home is occupied. Avoid heating an empty house for long periods, but consider frost protection, vulnerable occupants and the needs of the building.\n\nSet the main room thermostat to a comfortable level, then use radiator valves to reduce heat in rooms that need less. Do not place heat-producing appliances directly beside the thermostat, and avoid covering radiator valves with curtains or furniture.\n\nMake one change at a time and allow the home to settle before adjusting again. If rooms heat unevenly, controls do not respond, or the system cycles constantly, the issue may need balancing, maintenance or a controls review.\n\nEnergy Saving Trust’s guide gives an independent overview of the common control types and ways to use them.