ENERGY STAR Symbol

ENERGY STAR® Qualifying Criteria for Griddles

Version 1.1 – January 2011

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A product shall meet all of the identified criteria if it is to earn the ENERGY STAR symbol.

1) Definitions

  1. Single-Sided Commercial Griddle
    A commercial appliance designed for cooking food in oil or its own juices by direct contact with either a flat, smooth, hot surface (e.g., polished steel or chrome plate) or a hot channelled cooking surface (e.g., polished steel or chrome 1.27 cm ( ½-inch) grooved plate) where plate temperature is thermostatically controlled.
  2. Double-Sided Commercial Griddle
    A commercial appliance designed for cooking food in oil or its own juices by direct contact with two hot surfaces where temperature is thermostatically controlled. A double-sided griddle has hinged upper griddle plates (platens) that swing down over the food, thereby cooking the food from both sides at once.
  3. Product Family
    Several models offered within one product line that may differ in regards to energy consumption but are based on the same engineering design, differing only in regards to griddle size and/or griddle plate option.
  4. Fry-Top Range
    A multi-purpose appliance used for surface cooking by direct contact with a heated plate, and may also function as a device for roasting, broiling, grilling or any combination of these methods. A fry-top range may have an oven located beneath the cooktop or shelving or may be mounted on top of a refrigerated base.
  5. Manual Control
    Infinite-control knob to regulate the input of each burner or element. Manual controls are calibrated in terms of the percentage of input, as the control does not generally sense the temperature of the cooking surface.
  6. Thermostatic Control
    Simple temperature-feedback control that regulates the heaters based on griddle plate temperature. Thermostatic controls have the potential to sense the presence of cooking loads and offer better response and faster recovery when a load of fresh product is placed on the cooking surface.
  7. Cooking Energy Efficiency
    The ratio of energy absorbed by the food product to the total energy supplied to the griddle during cooking.
  8. Idle Energy Rate
    The rate of griddle energy consumption while it is maintaining or holding at a stabilized operating condition or temperature. Also called standby energy rate. For the purposes of this specification, the idle rate is normalized based on the area of the (bottom) cooking surface.

2) Scope

  1. Included Products
    Products that meet the definitions of a Single-Sided and Double-Sided Commercial Griddle as specified herein are eligible for ENERGY STAR qualification, with the exception of products listed in Section 2.B
  2. Excluded Products
    Griddles with manual controls and fry-top ranges, as defined in Section 1 above, are not eligible for ENERGY STAR under this specification.

3) Qualification Criteria

  1. Cooking Energy Efficiency and Idle Energy Rate Requirements
    Table 1: Energy Efficiency Requirements for
    Single - and Double-Sided Commercial Gas Griddles
    Cooking Energy Efficiency at heavy-load conditions ≥ 38%
    Normalized Idle Energy Rate ≤ 246 Btu/h per m²
    (2,650 Btu/h per ft² )
    Table 2: Energy Efficiency Requirements for
    Single- and Double-Sided Commercial Electric Griddles
    Tier 1: Effective May 8, 2009
    Cooking Energy Efficiency at heavy load conditions ≥ 70%
    Normalized Idle Energy Rate ≤ 33 watts/m²
    (355 watts/ft² )
     Tier 2: Effective January 1, 2011
    Cooking Energy Efficiency ≥ 70%
    Normalized Idle Energy Rate ≤ 30 watts/m²
    (320 watts/ft² )
  2. Idle Mode Normalization Calculations
    1. Single- and Double-Sided Griddles: The following formulae shall be used to normalize the idle energy rates for gas and electric griddles:

      qg-idle,n = [1000×qelec(kW)] ÷ [A(m²)], qe-idle,n = [qgas(Btu/h)] ÷ [A(m²)]

      Where

      qg-idle,n  =  normalized gas griddle idle energy rate Btu/h/m² (Btu/h/ft²)
      qgas  =  gas energy rate during idle (Btu/h)
      qe-idle,n  =  normalized electric griddle idle energy rate W/m² (W/ft²)
      qelec  =  electric energy rate during idle (kW)
      A  =  area of the bottom cooking surface m² (ft²) measured splashguard to splashguard and splashguard to grease trough
    2. Double-Sided Griddles that include an electric top plate and gas bottom plate: These product types shall meet the cooking energy efficiency and normalized idle energy rate for gas griddles in Table 1, above. The formula provided below shall be used to normalize idle energy rate in Btu/h per m² (ft²).

      qds-idle,n = [qgas(Btu/h) + 3413 × qelec(kW)] ÷ [A(m²)]

      Where

      qds-idle,n  =  normalized gas griddle idle energy rate Btu/h/m² (Btu/h/ft²)
      qgas  =  gas energy rate during idle (Btu/h)
      qelec  =  electric energy rate during idle (kW)
      A  =  area of the bottom cooking surface m² (ft²) measured splashguard to splashguard and splashguard to grease trough
  3. Additional Qualification Requirements for Double-Sided Griddles

    Double-Sided Griddles may qualify for ENERGY STAR under the following conditions:

    1. Integrated, double-sided units with full top platen (≥ 90% coverage from side to side) shall be tested and evaluated for qualification as a double-sided griddle.
    2. Integrated, double-sided unit with partial platen(s) (< 90% coverage from side to side) shall be tested and evaluated for qualification as a single-sided griddle (with top up and turned off).
    3. Double-sided units with add-on top platens (full or partial) shall be tested and evaluated for qualification as a single-sided griddle (with top up and turned off).

    Note: Integrated refers to double-sided griddles designed to operate only while using a top platen. Add-on top platens are sold to end users as options to a single-sided griddle and can be added on to a base model at the factory level or installed in the field.

  4. Significant Digits and Rounding
    1. All calculations shall be carried out with actual measured or observed values. Only the final result of a calculation shall be rounded. Calculated results shall be rounded to the nearest significant figure as expressed in the corresponding specification limit.
    2. Unless otherwise specified, compliance with specification limits shall be evaluated using exact values without any benefit from rounding.

4) Test Requirements

  1. Representative Models shall be selected for testing per the following requirements:
    1. For qualification of an individual product model, the representative model shall be equivalent to that which is intended to be marketed and labelled as ENERGY STAR.
    2. For qualification of a product family, the 0.91 m (3 ft.) model within the product family shall serve as the representative model. If product family includes units smaller than 0.91 m (3 ft.), each additional unit shall be tested and qualified separately from its product family. If smaller unit does not qualify, then it cannot be part of the qualifying product family.
  2. Each individual griddle plate option offered by the manufacturer for any one model shall be tested for ENERGY STAR qualification.
  3. When testing commercial griddles, the following test methods shall be used to determine ENERGY STAR qualification:
    Table 3: Test Methods for ENERGY STAR Qualification
    ENERGY STAR Requirement Test Method Reference
    Cooking Energy Efficiency ASTM F1275-03: Standard Test Method for the Performance of Griddles

    ASTM F1605-01: Standard Test Method for the Performance of Double-Sided Griddles

    Idle Energy Rate

5) Effective Date

This ENERGY STAR Commercial Griddle Specification shall take effect on the dates specified in Table 4, below. To qualify for ENERGY STAR, a product model shall meet the ENERGY STAR specification in effect on the model's date of manufacture. The date of manufacture is specific to each unit and is the date (e.g., month and year) on which a unit is considered to be completely assembled.

Table 4: Specification Effective Dates
Tier 1 Tier 2 (Electric Griddles Only)
May 8, 2009 January 1, 2011

6) Future Specification Revisions

ENERGY STAR reserves the right to change the specification should technological and/or market changes affect its usefulness to consumers, industry, or the environment. In keeping with current policy, revisions to the specification are arrived at through industry discussions. In the event of a specification revision, please note that ENERGY STAR qualification is not automatically granted for the life of a product model.

  1. Tier 2 Normalized Idle Energy Rate
    The Tier 2 normalized idle energy rate for electric griddles will be reviewed prior to January 1, 2011 to ensure it is appropriate for the marketplace.
  2. Partial Platen Performance
    At the time of developing this specification, the ASTM F1605 test method for measuring double-sided griddle performance could not be applied to units with partial platens. However, there is industry interest to revise the test method to more appropriately measure cooking energy efficiency and idle energy rate of double-sided griddles with partial platens. If new ASTM testing guidelines are developed for partial platen configurations, EPA will require that the new test method be applied to these product types for purposes of ENERGY STAR qualification.