What is the Building Regulations minimum standard for heating controls?

A heating system should only burn fuel when there is a demand for heat from the boiler, either for Heating or Hot Water. When this demand is satisfied, then the boiler should switch off again, it should not be able to fire until a new demand is created by the controls. This is called Boiler Interlock and represents the Minimum Standard required under Building Regulations for new and existing heating systems. Building Regulations apply whenever a boiler or cylinder is changed in a heating system. Both Heating and Hot Water should be controlled by both time and temperature (i.e, a programmer and thermostats). These should operate either motorised valves or the boiler (if it is a combi).Radiators should also be under the control of thermostatic radiator valves, except in the room where the room thermostat is fitted.