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
  • Energy efficient central heating - guide to HOME ENERGY SAVINGS

    If a heating and hot water system is to operate as intended and with optimum energy efficiency it must be effectively commissioned. This is especially relevant for controls since they must operate effectively over a wide range of usage and climatic conditions. Following the introduction of revised Building Regulations (part L) in 2002, it will become a mandatory requirement that all systems are satisfactorily commissioned. All controls should be installed and commissioned in accordance with manufacturers’ instructions. Care must be taken to install the wiring correctly, and a test should be carried out to make sure that the boiler interlock operates (ie the boiler switches off when there is no demand for heat). The heat emitter and hot water flow rates should be balanced, and the automatic bypass valve set correctly. All TRVs and thermostats must be adjusted to meet householder requirements, and the householder informed of any settings that should be changed between summer and winter.

    An important aim of this Guide is to provide information that will lead to improved energy efficiency and reduced CO2 emissions. The use of controls will have an impact on energy use in two different ways:

  • reducing heating requirements
  • increasing heating and hot water system efficiency.

    Reducing heating requirements has by far the biggest impact on energy consumption. This can be achieved by reducing the heating ‘on’ time and ‘set’ temperature. It is important to ensure that suitable controls are specified that give the householder the opportunity to adjust the controls to minimise energy demand. Some controls will also increase the efficiency of the system. For modern boilers fitted with the minimum set of controls, this effect will not be large.

    One of the most effective ways to save energy is to turn the heating down or off! Typically, a room thermostat fitted in the main living room would be set to around 21ºC. If this is reduced to 20ºC, heating energy consumption can be reduced by 6-10%.

    Householders must be carefully instructed in how to set and use heating appliance controls properly and effectively. The operation of programmers in particular can be difficult to understand and householders will receive little or no benefit from an incorrectly set device. They may waste energy.

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