Commercial Dishwashers Key Product Criteria

Energy and Water Efficiency Performance:

Qualifying models shall not exceed the energy and water consumption limits listed in the table below.

Requirements:

Effective October 11, 2007

Commercial dishwashers must meet the requirements provided in the table below to qualify as ENERGY STAR. Machines designed to be interchangeable in the field from high temp to low temp, and vice versa, must be indicated as such on their Qualified Product Information (QPI) form and must meet both the high temp and low temp requirements below to qualify as ENERGY STAR.

Efficiency Requirements for Commercial Dishwashers
Machine Type High Temp Efficiency Requirements Low Temp Efficiency Requirements
Idle Energy Rate* Water Consumption** Idle Energy Rate* Water Consumption
Under Counter <= 0.90 kW <= 1.00 gal/rack <= 0.5 kW <= 1.70 gal/rack
Stationary Single Tank Door** <= 1.0 kW <= 0.950 gal/rack <= 0.6 kW <= 1.18 gal/rack
Single Tank Conveyor <= 2.0 kW <= 0.700 gal/rack <= 1.6 kW <= 0.790 gal/rack
Multiple Tank Conveyor <= 2.6 kW <= 0.540 gal/rack <= 2.0 kW <= 0.540 gal/rack
*Idle energy rate measured with door closed and representative of the energy used by the tank heater only.
** Includes pot, pan, and utensil machines.

Testing Procedures:

  • Water Consumption: NSF/ANSI 3-2007 Standard, Commercial Warewashing Equipment
  • Idle Energy Rate for Hot Water and Chemical Sanitizing Undercounter and Stationary Rack Single Tank Door-Type Dishwashers: ASTM Standard F1696, Standard Test Method for Energy Performance of Single-Rack Hot Water Sanitizing, Door-Type Commercial Dishwashing Machines.
  • Idle Energy Rate for Hot Water and Chemical Sanitizing Single and Multiple Tank Rack Conveyor Dishwashers: ASTM Standard F1920, Standard Test Method for Energy Performance of Rack Conveyor, Hot Water Sanitizing, Commercial Dishwashing Machines.

Definitions:

Dishwashing Machine

A machine designed to clean and sanitize plates, glasses, cups, bowls, utensils, and trays by applying sprays of detergent solution (with or without blasting media granules) and a sanitizing final rinse.

Under Counter Dishwasher

A machine with an overall height 38 inches or less, in which a rack of dishes remains stationary within the machine while being subjected to sequential wash and rinse sprays, and is designed to be installed under food preparation workspaces. Under counter dishwashers can be either chemical or hot water sanitizing, with an internal booster heater for the latter. For purposes of this specification, only those machines designed for wash cycles of 10 minutes or less can qualify for ENERGY STAR.

Stationary Rack, Single Tank, Door Type Dishwasher

A machine in which a rack of dishes remains stationary within the machine while subjected to sequential wash and rinse sprays. This definition also applies to machines in which the rack revolves on an axis during the wash and rinse cycles. Subcategories of stationary door type machines include: single and multiple wash tank, double rack, pot, pan and utensil washers, chemical dump type and hooded wash compartment (“hood type”). Stationary rack, single tank, door type models are covered by this specification and can be either chemical or hot water sanitizing, with an internal or external booster heater for the latter.

Single Tank Conveyor Dishwasher

A warewashing machine that employs a conveyor or similar mechanism to carry dishes through a series of wash and rinse sprays within the machine. Specifically, a single tank conveyor machine has a tank for wash water followed by a final sanitizing rinse and does not have a pumped rinse tank. This type of machine may include a pre-washing section before the washing section. Single tank conveyor dishwashers can be either chemical or hot water sanitizing, with an internal or external booster heater for the latter.

Multiple Tank Conveyor Dishwasher

A conveyor type machine that has one or more tanks for wash water and one or more tanks for pumped rinse water, followed by a final sanitizing rinse. This type of machine may include one or more pre-washing sections before the washing section. Multiple tank conveyor dishwashers can be either chemical or hot water sanitizing, with an internal or external booster heater for the latter.

Hot Water Sanitizing (High Temp) Machine

A warewashing machine that applies potable hot water to the surfaces of wares to achieve sanitization.

Chemical Sanitizing (Low Temp) Machine

A warewashing machine that applies potable water and a chemical sanitizing solution to the surfaces of wares to achieve sanitization.