Dishwasher with energy recovery system

A method for operating a dishwasher configured to perform cleaning cycles each including a washing period and a rinsing period for cleaning objects, comprising:

• receiving a portion of a washing liquid from a wash tank containing the washing liquid;
• spraying the received portion of the washing liquid into a wash chamber loaded with the objects during the washing period;
• collecting liquid from the wash chamber and returning the collected liquid into the wash tank to add to the washing liquid;
• transferring an excessive portion of the washing liquid from the wash tank to a wastewater tank as wastewater, the excessive portion of the washing liquid resulting from a level of the washing liquid in the wash tank exceeding a threshold level;
• transferring thermal energy from the wastewater to cleaning water flowing through a wastewater heat exchange coil detachably placed in the wastewater tank, to heat the clean water;
• and
• transferring the wastewater from the wastewater tank to a drain pipe.

A method for operating a dishwasher configured to perform cleaning cycles each including a washing period and a rinsing period for cleaning objects, comprising:

• holding the objects in a wash chamber;
• washing the objects during the washing period;
• rinsing the objects during the rinsing period;
• drawing steam from the wash chamber during each cycle of the cleaning cycles;
• condensing the steam while heating additional clean water using a steam heat exchange coil including multiple loops each connected to an additional clean water inlet directly to receive a portion of the additional clean water and connected to an additional clean water outlet directly to output a portion of heated additional clean water;
• and
• blowing steam remaining from the condensing out of the dishwasher.