| 摘要 |
A heat exchange unit 10 for heating cold incoming mains water comprises a casing 40 communicating waste fluid that is in heat exchange relationship with the incoming mains water, which also passes through the casing. Waste water communicates via a waste outlet 13 and connecting pipe 14 to pass over a heat transfer element 20 disposed inside the casing 40. The casing 40 may have a weir (48, fig 4) with a well (51) which receives pipe 14 so that it functions as a u-bend water trap. The incoming mains water may enter the casing 40 at lower position that which it exits (fig 6) and may flow in an opposite direction to the waste water. Heat exchange unit 10 may located underneath a shower tray 11 or may be integral with the tray, a bath tub or domestic appliance casing. The heated mains water may be supplied to an electric shower, a mixer shower using water from hot water cylinder, a bath, a dishwasher or washing machine. |
