ENERGY STAR Symbol

ENERGY STAR® Product Specifications for Commercial Steam Cookers

Version 1.2 – January 2011

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

1) Definitions

Below are the definitions of the relevant terms in this document.

  1. Commercial Steam Cooker
    Also referred to as a "compartment steamer", a device with one or more food steaming compartments in which the energy in the steam is transferred to the food by direct contact.  Models may include countertop models, wall-mounted models and floor-models mounted on a stand, pedestal or cabinet-style base.
  2. Cooking Energy Efficiency
    The quantity of energy input to the food products; expressed as a percentage of the quantity of energy input to the appliance during the heavy-, medium-, and light-load tests.
  3. Heavy (Potato) Load Cooking
    The manufacturer's stated capacity of 300 by 500 by 65 mm (12 by 20 by 2 1/2 inch) perforated hotel pans each filled with 3.6 ± 0.1 kg (8.0 ± 0.2 lb) of fresh, whole, US No. 1, size B, red potatoes.
  4. Idle Energy Rate
    The rate of appliance energy consumption while it is maintaining or holding at a stabilized operating condition or temperature.
  5. Product Family
    Individual models offered within a product line based on the same engineering design, including number of pans. Performance results across the models represented in the qualified product line shall be equivalent.

2) Scope

  1. Included Products
    Products that meet the definition of a Commercial Steam Cooker as specified herein are eligible for ENERGY STAR qualification, with the exception of products listed in Section 2.B.
  2. Excluded Products
    Any product types not specifically defined in Section 2.A are not eligible for ENERGY STAR qualification.

3)  Qualification Criteria

  1. Cooking Energy Efficiency and Idle Energy Rate Requirements:
    Table 1: Energy Efficiency Requirements for Electric Steam Cookers
    Pan Capacity Heavy Load Cooking
    Energy Efficiency
    Idle Rate
    (watts)
    3-pan 50% 400
    4-pan 50% 530
    5-pan 50% 670
    6-pan and larger 50% 800
    Table 2: Energy Efficiency Requirements for Gas Steam Cookers
    Pan Capacity Heavy Load Cooking
    Energy Efficiency
    Idle Rate
    (Btu/h)
    3-pan 38%   6,250
    4-pan 38% 8,350
    5-pan 38% 10,400
    6-pan and larger 38% 12,500
  2. 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 digit as expressed in the corresponding specification limit.
    2. Unless otherwise specified, compliance with specification limit 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, any model within that product family can be tested and serve as the representative mode.
  2. When testing commercial steam cookers, 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 Standard F1484-99, Test Method for the Performance of Steam Cookers
    Idle Energy Rate

5) Effective Date

The ENERGY STAR Commercial Steam Cooker specification shall take effect on August 1, 2003. To qualify for ENERGY STAR, a product model must 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 (eg. month and year) on which a unit is considered to be completely assembled.

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 the product model.