A heat sink is a thermally conductive heat exchanger such as a FARAL Aluminium radiator that will quickly absorb and disperse high temperature heat away from a heating system.

A standard FARAL Aluminium radiator can operate at up to 110 oC and will heat up and cool down very quickly because of the aluminium construction of the radiator.

A heat sink can be positioned anywhere in the heating circuit but please make sure that the KW heat you are trying to remove from the system is not excessive for the area or room it is being positioned as this might make that room very uncomfortable to live in.

The most common place to have a heat sink radiator in a small property is in the bathroom because a bathroom radiator can remain on all the time to dry off towels but please check that the output of the bathroom radiator has enough output to be sure it can dissipate the heat required quickly enough.

It is recommended that any radiator being used as a heat sink has a full flow of water flowing across it using a lock shield radiator valve on both the flow and return of the radiator rather than a thermostatic valve on the flow that opens and closes according to the room temperature. 

Using a lock shield radiator valve on the FARAL radiator flow and return will stop anybody from adjusting the valve setting from fully open and allow the central heating water to circulate unrestricted through the radiator dissipating all the heat required from the heating system thus avoiding overheating and damage to the boiler and associated controls.