A dishwasher includes a washing system designed as a recirculation system, which has at least one washing arm with at least one washing nozzle for spraying washing liquid onto items to be washed, a washing tank for collecting at least some of the sprayed washing liquid and a feed line system with a washing pump, via which washing liquid collected in the washing tank can be or is fed to the at least one washing arm. In the feed line system, at least one cleaning opening is formed or provided, via which, during the operation of the washing pump, some of the washing liquid conveyed by the washing pump in the direction of the at least one washing arm is sprayed or discharged into a treatment chamber or treatment zone of the dishwasher.

A dishwasher includes a heat recovery apparatus to recover thermal energy of the wastewater and/or exhaust air and to transfer the thermal energy to at least one treatment liquid to be sprayed and/or to a drying air. A primary circulation system has a heat pump assembly and a secondary circulation system. A heat exchanger unit of the heat pump assembly enables at least a portion of the thermal energy transferred to refrigerant of the primary circulation system to be transferred to a carrier medium in the secondary circulation system. A heat exchanger unit of the secondary circulation system enables at least a portion of the thermal energy transferred to the carrier medium to be transferred as utility heat to the treatment liquid and/or to the drying air.

A dishwasher includes a heat recovery apparatus to recover thermal energy of the wastewater and/or exhaust air and to transfer the thermal energy to at least one treatment liquid to be sprayed and/or to a drying air. A primary circulation system has a heat pump assembly and a secondary circulation system. A heat exchanger unit of the heat pump assembly enables at least a portion of the thermal energy transferred to refrigerant of the primary circulation system to be transferred to a carrier medium in the secondary circulation system. A heat exchanger unit of the secondary circulation system enables at least a portion of the thermal energy transferred to the carrier medium to be transferred as utility heat to the treatment liquid and/or to the drying air.