NOVELTY - A heat transferring system (100) comprises a first receptacle (102) having an inlet (106) for ingress of a first liquid such as sewage (104) and an outlet (110) for egress of sewage; and a second receptacle (120) having an inlet (122) for ingress of a second liquid and an outlet (124) for egress of the second liquid. The two receptacles are arranged in proximity to each other, and are arranged such that they allow a quantity of heat to transfer from the second liquid to the first liquid.    USE - For transferring heat from second liquid e.g. heated water that has been used to cool an air conditioning unit to first liquid in the form of waste liquid such as sewage (claimed), useful for treating the sewage and re-use of treated sewage at grey water applications, such as watering of plants and fields.    ADVANTAGE - The system enables a waste liquid to be used as a heat sink. The system is desirable in areas where fresh water (which is typically used by existing cooling towers) is scare. The second liquid, which is typically heated, flows through the conduit heat from the second liquid passes to the waste liquid contained in the receptacle, to cool the second liquid. The system transfers heat to waste liquid, and assists in breaking down the waste liquid, which can be particularly advantageous when the waste liquid is sewage. The system can potentially replace traditional cooling towers, which can be unsightly and relatively expensive. Since the receptacles are underground, they are out of sight and do not have a visual impact. The apparatus is configured such that it is relatively simple to replace an existing section of sewage line or sewage mains with the apparatus. The system transfers heat from the second liquid to the first liquid thus resulting in the treatment of first liquid such as sewage. The treatment comprises breaking down of heat sensitive microbial components of the sewage.    DETAILED DESCRIPTION - A heat transferring system (100) comprises a first receptacle (102) having an inlet (106) for ingress of a first liquid such as waste liquid e.g. sewage (104) and an outlet (110) for egress of sewage; and a second receptacle or element (120) having an inlet (122) for ingress of a second liquid and an outlet (124) for egress of the second liquid. The second receptacle includes a portion located in proximity of the first receptacle. The first and second receptacles are arranged such that they allow a quantity of heat to transfer from the second liquid to the first liquid. The second liquid comprises heated water that has been used to cool an air conditioning unit. The second receptacle forms a jacket on or at least a portion of the first receptacle. The first receptacle comprises a portion of a sewage conduit. The system comprises a metering unit, a gas storage device for collecting and storing gas, a treatment device for treatment of the first liquid. The first and second receptacles are located underground.    An INDEPENDENT CLAIM is included for providing a quantity of a first liquid in a first receptacle, and effecting a flow of a second liquid through a second receptacle such that they allow a quantity of heat to transfer from the second liquid to the first liquid.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of the system for transferring heat.    heat transfer system (100)    first receptacle (102)    sewage (104)    inlet for ingress of first liquid (106)    outlet for egress of first liquid (110)    second receptacle (120)    inlet for ingress of second liquid (122)    outlet of second liquid. (124)