Grey water heat recovery apparatus

A grey water heat recovery apparatus in which heat is transferred between a grey water stream and a fresh water stream, wherein the apparatus comprises:

• a grey water flow path leading from a source inlet to a drain outlet;
• a plurality of heat exchangers arranged in said grey water flow path;
• a separator arranged upstream of said heat exchangers, arranged to separate grey water from the source inlet into a plurality of parallel sub-paths, each sub-path being lead to one of said plurality of heat exchangers;
• a collector arranged downstream of said heat exchangers, arranged to reassemble the grey water from the sub-paths into a single flow path;
• wherein
• each heat exchanger comprises a grey water tube extending in a generally vertical direction from the separator to the collector, and an outer tube surrounding at least a part of the grey water tube, the outer tube defining an annular space around the grey water tube;
• and
• a fresh water flow path formed within the annular spaces around the grey water tubes in said heat exchangers in a flow direction being opposite to the flow direction of the grey water, wherein the separator comprises a separator inlet leading into a plurality of vortex generating outlets connected to said sub-paths, said vortex generating outlets arranged distributed around said separator inlet.