What is Boiler Interlock?

Boiler Interlock
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Boiler interlock is not a physical device but an arrangement of the system controls (room thermostats, programmable room thermostats, cylinder thermostats, programmers and time switches) so as to ensure that the boiler does not fire when there is no demand for heat. In a system with a combi boiler it can be achieved by fitting a room thermostat.

In a system with a regular boiler it can be achieved by correct wiring interconnection of the room thermostat, cylinder thermostat, and motorised valve(s). It may also be achieved by more advanced controls, such as a boiler energy manager. TRVs alone are not sufficient for boiler interlock.

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A Boiler Interlock is an arrangement of the heating system controls (Room thermostats, , programmable room thermostats, cylinder thermostats, programmers and time switches ) in such a way that ensures that the boiler does not fire when there is no demand for heat. Please contact us at assessors@fiber.ie if you have any other queries or refer to the Sustainable Energy Ireland (SEI) website at www.sei.ie.

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