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Report on New Energy Conservation Standards for Gas or Oil Water Heaters Compiled

July 28, 2020

A working group on energy conservation standards (*1), a body established under the Agency for Natural Resources and Energy (ANRE), compiled a Report on New Energy Conservation Standards for Gas or Oil Water Heaters.

Concerning new standard energy consumption efficiency  (energy conservation standards) for gas water heaters and oil water heaters under the Act on the Rational Use of Energy (Act No. 49 of 1979), a working group on energy conservation standards, a body established under ANRE, has been holding discussions since April 2017. As part of this effort, on July 28, 2020, the working group compiled a report titled “Report on New Energy Conservation Standards for Gas or Oil Water Heaters” (*2) following the results of its meeting held on June 24, 2020.

1. Outline of the new energy conservation standards

Note: The new standard expects manufacturers to improve the existing thermal efficiency of the target heaters by 5.4% based on the current energy conservation performance of such heaters. This improvement corresponds to a decrease in heat loss during warm water supply by 23%.

This efficiency  was calculated by introducing the indices based on the “standard usage mode,” a mode indicating a model approach to using warm water in which standard conditions of use are considered, e.g., amount of supplied warm water, temperature thereof, period of time for keeping the warmth of such water and ambient temperature (*3).

*Notes:

  1. The Working Group on Classification Standards for Gas and Oil Appliances of the Energy Efficiency and Conservation Subcommittee of the Committee on Energy Efficiency and Renewable Energy under the Advisory Committee for Natural Resources and Energy
  2. Report compiled by the Working Group on Classification Standards for Gas and Oil Appliances of the Energy Efficiency and Conservation Subcommittee of the Committee on Energy Efficiency and Renewable Energy under the Advisory Committee for Natural Resources and Energy
  3. As for heaters, the rated indices are used as before.

Related document

Division in Charge

Energy Efficiency Division, Energy Efficiency and Renewable Energy Department