London Heating Services

  • Central Heating Guide
  • C/H Controls Introduction
  • C/H Thermal Controls
  • C/H Valve Controls
  • C/H Function Controls
  • C/H System Replacement
  • C/H Controls Installation
  • Energy efficient home
  • Heating system function controls

    This section explains the range of heating system function controls that are commonly available, what they do and why they are important.

    Time control for on/off-peak electricity use, which ensures that the water is heated using electricity during off-peak periods. This time control is not usually accessible to the user. The control also frequently provides a separate boost control (usually one or two hours) so that a smaller quantity of water can be heated during the day but using more expensive on-peak electricity.

    These controls are self-contained devices that include a number of the functions described in this section. They usually include weather or load compensation and sometimes also optimum start, frost protection, night setback, anti-cycling control and hot water control.

    Integrated central control system for electric storage and panel heaters that provides programmed space temperatures at different times of the day for a number of separate heating zones in the dwelling. It minimises the charge period of the storage heaters according to weather and also controls the switching of the panel heaters.

    The following control functions are often built into heating units.

    Reduces boiler water temperature for space heating according to internal/external air temperature and should increase the efficiency of condensing boilers by reducing the average return water temperature of the system.

    Delayed start
    Reduces energy use by delaying boiler start time when the weather is mild.

    Optimum start
    Adjusts the heating start time to give the required dwelling comfort temperature at a chosen time.

    Night setback
    Allows a low temperature to be maintained at night. Provides improved comfort and reduced dwelling warm-up time in cold weather. A programmable room thermostat can provide this facility.

    Self-adaptive function
    Reduces appliance ‘on’ time by learning from previous temperature characteristics.

    Anti-cycling control
    Delays boiler firing to reduce cycling frequency but is unlikely to provide significant energy savings[7]. In some circumstances their use may reduce energy consumption, but usually at the expense of performance or comfort. Standalone units (those not supplied as part of the boiler) are not generally recommended as they provide little or no improvement over the minimum level of control shown in this Guide.

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