Oil Water Heaters

Oil water heaters, except the following:

1) ones which are not the objects of JIS S 3021(2017) , 3024(2017), or JIS S 3027(2017)(without high pressure type of small oil water heaters and high pressure type of bath tub oil water heaters that are stipulated in JIS S 2091(2013)),

2) ones for business use,

3) ones for hot water supply, which are storage type for heating and are not instantaneous type for heating, or

4) ones for heaters, which are storage type for heating and are not instantaneous type for heating.

①FY2006 and each subsequent fiscal year (until FY 2024)

Energy consumption efficiency shall be heat efficiency (%) measured as stipulated in JIS S 3031(2009).

②FY2025 and each subsequent fiscal year

[Hot water supply]

●Energy consumption efficiency shall be heat efficiency (%) measured as stipulated in JIS S 2075 (2011)

[Heater]

●Energy consumption efficiency shall be heat efficiency (%) measured as stipulated in JIS S 3031 (2009)

①FY2006 and each subsequent fiscal year (until FY 2024)

In the target fiscal year and each subsequent fiscal year, for each category, the weighted average value obtained by weighting energy consumption efficiency with shipment volume shall not be below the target standard value.

Category				[Target standard value] Standard energy consumption efficiency
Purpose	Heating type	Air supply and exhaust type or control method	Category name
For hot water supply	Instantaneous type	―	A	86.0
	Storage type with rapid heating system	―	B	87.0
	Storage types other than rapid heating system	―	C	85.0
For heaters	Instantaneous type	Unvented type	D	85.3
		Vented type	E	79.4
		Direct vent type	F	82.1
	Storage type with rapid heating system	On/off control	G	87.0
		Other than on/off control	H	82.0
	Storage types other than rapid heating system	―	I	84.0
For baths	Water heaters with a center flue heat exchanger	―	J	75.0
	Water heaters without a center flue heat exchanger	―	K	61.0

Remarks:

“For hot water supply” refers to equipment mainly used to supply hot water, including equipment featuring heating or bathing functions. “For heaters” refers to equipment mainly used for heating, including equipment that has hot water supply or bathing functions. “For baths” refers to equipment used mainly for bath use, including equipment that has hot water supply or heating functions. “Rapid heating system” refers to equipment of which heating time (as measured by the heating speed measurement method described in JIS S 3031(2009)) is within 200 seconds. “Center flue heat exchanger” refers to the air flue that penetrates the hot water supply section. “On/off control” refers to those that control by only ignition and extinction.

②FY2025 and each subsequent fiscal year

In the target fiscal year and each subsequent fiscal year, for each category, the weighted average value obtained by weighting energy consumption efficiency with shipment volume shall not be below the target standard value.

Category				[Target standard value] Standard energy consumption efficiency
Category name	Purpose		Heating type
Ⅰ	For hot water supply	Without bath use	Instantaneous type	89.68×βⅠi
Ⅱ			Storage type	76.88
Ⅲ		With bath use	Instantaneous type	90.01×βⅢi
Ⅳ			Storage type	76.07
Ⅴ	For heaters		Storage type	87.06×βⅤi

Structure type		βⅠi
Structure name	Structure
Ⅰ-1	Pressure-spray-type	0.9585
Ⅰ-2	Other	1.0000

Structure type		βⅢi
Structure name	Structure
Ⅲ-1	Pressure-spray-type	0.9492
Ⅲ-2	Other	1.0000

Structure type		βⅤi
Structure name	Structure
V-1	On/off control(limited to conventional type）	1.0051
V-2	Other	1.0000

【Judgment criteria exceptions】

The manufacturers of appliances are required to keep the harmonic mean of the energy consumption efficiency of appliances shipped for each fiscal year starting from the targeted fiscal year, weighted with shipment volume by category, at the same level or higher than the harmonic mean of the standard energy consumption efficiency weighted with shipment volume by category. Also as an exception, evaluation through average thermal efficiency by company is adopted.

• FY2006 and each subsequent fiscal year (until FY2024)
• FY2025 and each subsequent fiscal year

Energy consumption efficiency was improved by about 7.1 in the target fiscal year (FY2025).

●Product name and type

●Category name

●Structure name(limited to cases of category Ⅰ, category Ⅲ or category Ⅴ)

●Energy consumption efficiency

●Name of manufacturer, etc.

Display items shall be presented at locations where they can be readily noticed in catalogs showing performance indications and on product bodies.

Manufacturers or importers whose annual manufacturing volume or importing volume (limited to shipment to the domestic market) is 600 units or more may be subject to recommendations and orders.