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  5. New Energy Efficiency Standards for Electric Water Heaters (Heat Pump Water Heaters for Home Use) Formulated

New Energy Efficiency Standards for Electric Water Heaters (Heat Pump Water Heaters for Home Use) Formulated

May 26, 2021

On May 26, the Ministry of Economy, Trade and Industry (METI) promulgated a Public Notice that stipulates new standards of energy consumption efficiency (energy efficiency standards) and other rules for electric water heaters (heat pump water heaters for home use).

1. Background

Under the Act on the Rational Use of Energy (Act No. 49 of 1979), METI is promoting efforts toward energy efficiency regarding equipment for which it is particularly necessary to improve the energy consumption efficiency. Its approaches include setting energy efficiency standards that relevant manufacturers, etc. are required to ensure that their products satisfy by the target fiscal year. These future standards are formulated based on various factors, such as the performance of the products with the current highest efficiency rate (called "top runners").

In households, energy consumed in hot water systems accounts for a large portion of total energy consumption. In light of this fact, a working group discussed reviewing the energy efficiency standards for electric water heaters (heat pump water heaters for home use), and compiled a report (Note) in March 2021 indicating a new target fiscal year, energy efficiency standards, and other matters. In light of this report, on May 26, METI promulgated a Public Notice that stipulates new energy efficiency standards and other rules with FY2025 as the target year.

2. Public Notice promulgated

Public Notice to Partially Amend the Judgment Standards for Manufacturers, etc. of Energy-Consuming Equipment Concerning the Enhancement of the Energy Consumption Efficiency for Electric Water Heaters

3. Outline of the new energy efficiency standards

Target fiscal year:

FY2025 (Reiwa 7 fiscal year)

Target equipment:

Electric water heaters (heat pump water heaters for home use which use carbon dioxide as a coolant)

Category and energy efficiency standards:

The energy standard values specified for each category shown in the table below

Note: The target equipment is expected to improve energy consumption efficiency by about 5% compared with the achievements of the current standard fiscal year (FY2017).

Category name Presumed household Number of storage tanks Storage capacity Specifications Energy efficiency standard value
A Small family Non-cold regions 3.0
B Cold regions 2.7
C Standard One Less than 320 L Non-cold regions 3.1
D Cold regions 2.7
E 320 L or more,
less than 550 L
Non-cold regions 3.5
F Cold regions 2.9
G 550 L or more Non-cold regions 3.2
H Cold regions 2.7
I Multiple Non-cold regions 3.0
J Cold regions 2.7

4. Promulgation and enforcement date

Promulgation date:

May 26, 2021

Enforcement date:

June 1, 2021

(Note)
Report on New Energy Efficiency Standards for Electric Water Heaters compiled by the Working Group on Classification Standards for Air Conditioners and Electric Water Heaters 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, announced in March 2021

Division in Charge

Energy Efficiency Division, Energy Efficiency and Renewable Energy Department, Agency for Natural Resources and Energy