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The heater surfaces will of course vary according to the weather and the amount of heat stored. Because of variations in the siting for different heaters in rooms, each heater needs to be set individually and the finally chosen input, control knob settings may be different in different rooms. MANUALLY-ADJUSTED INPUT CONTROL (SLIMLINE) This control knob is marked overnight charge numbers 1 to 6, setting 1 giving the least overnight charge and setting 6 giving the maximum overnight charge. It wo