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About This Item

 

Full Description

ASHRAE Standard 118.1 provides test procedures for rating directly heated commercial service water heating equipment.

The revised 2022 edition of the standard:

  • Updated the scope to be consistent with the Department of Energy's July 11, 2015, final rule that establishes new definitions for "commercial" and "residential duty commercial" water heaters.
  • Revised the definition of "heat-pump water heater."
  • Updated the classification for Type III water heaters.
  • Section 7.2, "Water Piping," was updated and defined visually in Figures 1 through 14.
  • Updated venting requirements.
  • Reviewed and revised all equations as appropriate for I-P and SI units.
  • Revised apparatus for testing AS-HPWH with ducted discharge air.
  • Revised test tolerances (Table 1).
  • Updated supply water temperatures for testing heat pumps (Table 3).
  • Revised test methods and calculations for all heat-pump water heaters (including air source) to be steady state, consistent with Types I, II, and III water heaters.
  • Updated setting outlet water temperature for heating capacity for Types 1 through V water heaters.
  • Added water heaters with multiple outlet water connections.
  • Added new standby loss test method and calculations for Types II and III water heaters.
  • Updated references and appendices.
 

Document History

  1. ASHRAE 86376

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    ANSI/ASHRAE Standard 118.1-2022, Method of Testing for Rating Commercial Gas, Electric, and Oil Service Water Heating Equipment

    • Most Recent
  2. ASHRAE 118.1-2012


    Electric and Oil Service Water Heating Equipment (ASHRAE/ANSI Approved)

    • Historical Version
  3. ASHRAE 118.1-2008


    Electric, and Oil Service Water Heating Equipment (ANSI/ASHRAE Approved)

    • Historical Version
  4. ASHRAE 118.1-2003


    Electric, and Oil Service Water Heating Equipment (ANSI Approved)

    • Historical Version
  5. ASHRAE 118.1-1993


    Electric, and Oil Water Heaters (ANSI approved)

    • Historical Version