Dish washing machine with heat exchangers

A dish washing machine comprising:

• a housing having an interior wash space for washing dishes, the interior wash space being encompassed by at least one wall, the housing having a liquid inlet for adding a liquid to the dish washing machine and a liquid outlet for removing dirty liquid from the dish washing machine;
• at least one rotating spray nozzle for spraying the liquid onto dishes positioned within the interior wash space;
• a heating tank for heating the liquid which is supplied to the at least one rotating spray nozzle for spraying onto the dishes in the interior wash space;
• at least two heat exchange systems within the housing including at least a first heat exchange system and a second heat exchange system, the at least two heat exchange systems transferring heat from the liquid heated by the heating tank to the liquid added to the dish washing machine from the liquid inlet;
• the liquid entering the dish washing machine passes sequentially from the liquid inlet, then to the first heat exchange system, then to the second heat exchange system and then to the heating tank;
• the first heat exchange system comprises a pipe having a first path therethrough and a second path therethrough;
• the first path is located between the liquid inlet and the second heat exchange system;
• the second path is located between a drain for the interior wash space and the liquid outlet of the housing;
• the second heat exchange system includes a fluid path adjacent the at least one wall;
• and
• the liquid in the fluid path of the second heat exchange system exchanges heat with the liquid sprayed from the at least one rotating spray nozzle.