Material 3-1

THE RESEARCH COMMITTEE FOR TOTAL ENERGYAND NATURAL RESOURCES
THE ENERGY CONSERVATION STANDARDSWORKING GROUPTHE SUB-COMMITTEE FORJUDGEMENT CRITERIAFOR GAS AND OIL APPLIANCESSUMMARY OF FINAL CRITERIA

April 3, 2002
1

This Sub-Committee deliberated on matters that would serve as criteria for manufacturers andimporters of gas and oil appliances (hereinafter referred to as "manufacturers and the like") inmaking decisions about energy consumption efficiency and the like of gas and oil appliances andcompiled a summary as follows.

1.

Scope (See Attachment 1){ Gas burning space heaters (limited to gas burning space heaters that use city gas 13A or LPgas), excluding open types and semi-enclosed types.
{ Oil burning space heaters, excluding open types, enclosed types with a fuel consumption ofover 2.75 liters/hour, and semi-enclosed types with a fuel consumption of over 4.0 liters/hour.
{ Gas cooking appliances (limited to household gas cooking appliances that use city gas 13A orLP gas), excluding gas grills, gas ovens, gas rice cookers, gas cooking tables, and portablebutane stoves.
{ Gas burning water heaters (limited to household gas burning water heaters with an indicatedgas consumption of 70 kW or less that use city gas 13A or LP gas), excluding gas hot water
storage heaters, atmospheric-pressure gas hot water storage heaters, combined room and water
heaters, installed-in bath tub gas water heaters, and bath tub gas water heaters for special
applications (*).
*・Spontaneous combustion, semi-enclosed type bath tub gas water heaters that are
equipped with a capability of oxygen depletion safety shut off and are installed in abathroom
・Power burner combustion, forced circulation, enclosed type bath tub gas water heaters(with a hot water supply) that are used as replacements for spontaneous combustion,
enclosed type bath tub gas water heaters connected with a supply and exhaust duct・Power burner combustion, forced circulation, enclosed type bath tub gas water heaters(with a hot water supply) that are equipped with a capability of oxygen depletion safety
shut off and are installed in a bathroom{ Oil burning water heaters (for household use only), excluding wick type oil burning bathheaters, pot type oil burning bath heaters, combined oil and firewood bath heaters, and hot
water boiler with a water head pressure of over 10m up to 20m inclusive and a heat transfer
area of 2 m2 or less.
2.

Judgment Criteria for Manufacturers and the Like (See Attachments 2 to 4)(1) Target year
FY 2006(2) Target standard value
Regarding the gas and oil appliances shipped to the domestic market by each manufacturer orthe like in the target year, a weighted average of energy consumption efficiency must not beless than the target standard value in each category shown in the following table. The
weighted average is calculated for each category as follows: first, the energy consumption
efficiency should be measured by the measuring method set forth in Paragraph (3), and then it
should be averaged using the number of units shipped by each manufacturer as the weight.

2

[Gas burning space heater]
Category

Air supply and exhaust and heat exchange type1)

Enclosed forced convection type

Target standard value (%)
82.0[Oil burning space heater]
Category

Air supply and exhaust and heat exchange type

Target standard value (%)1)

Enclosed natural convection type83.52)

Enclosed forced convection type86.03)

Semi-enclosed radiating type69.04)

Semi-enclosed natural convection type(Note)

Forced convection type

Note: Stoves with a fuel consumption of 1.5 liters/hour or less: 67.0%
Stoves with a fuel consumption of over 1.5 liters/hour: According to the following
expression
Energy consumption efficiency E (%) = -3.0 x fuel consumption (liters/hour) + 71.5
[Gas cooking appliance]Category

Product characteristic

Installation pattern1)

Gas cooking stove

Table-top type

51.0

Built-in type48.52)
3)

Cooking stove with a Table-top typegas grill4)
5)

Built-in type6)7)8)

Number of burners

2 or less56.3

3 or more

52.4

2 or less

53.0

3 or more

55.6

Cabinet or stationary typeGas range

Target standard
value (%)

49.7
48.4

Note: The energy consumption efficiency (thermal efficiency) of gas cooking appliances withmore than two burners is calculated as a weighted average using weights of 1 for smallburners, 2.1 for medium burners, and 3.5 for large burners.
Definitions of burners are as follows:
Small burners: Burners with an indicated gas consumption of 2.02 kW or lessMedium burners: Burners with an indicated gas consumption of over 2.02 kW up to
3.49 kW inclusive
Large burners: Burners with an indicated gas consumption of over 3.49 kW up to
5.80 kW inclusive3

[Gas burning water heater]
Category1)

ProductCombustion
characteristicsystem
Instantaneous gas Spontaneouswater heater
combustion

Circulation
system－2)

Air supply and exhaustsystemOpen type

Target standard
value (%)
83.5

Semi-enclosed type
Enclosed typeSemi-enclosed type
Enclosed type
Outdoor type

78.0

Semi-enclosed type
Enclosed type (BF-DP)

75.56)

Enclosed type(BF)

71.07)

Outdoor type76.4

Semi-enclosed type
Enclosed type
Outdoor typeSemi-enclosed type
Enclosed type
Outdoor typeSemi-enclosed type
Enclosed type(BF-DP)

70.811)

Enclosed type(BF)

77.012)

Outdoor type

78.9

Semi-enclosed type
Enclosed type
Outdoor typeSemi-enclosed typeEnclosed type
Outdoor type76.13)

Power burner
combustion－4)
5)Bath tub gas water Spontaneous
heatercombustion(without a hotwater supply)

Naturalcirculation

8)

Power burner Natural
combustion
circulation

9)

Forcedcirculation

10)

Bath tub gas water Spontaneous
combustion
heater(with a hot watersupply)

Naturalcirculation

13)

Power burner Natural
combustion
circulation

14)

Forcedcirculation

15)

80.0
82.0

77.0

78.0

78.8
80.4

Note: The energy consumption efficiency (thermal efficiency) of bath tub gas water heaters (with ahot water supply) is calculated as a weighted average using weights of 1 for parts of bath and 3.3 forparts of hot water supply.

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[Oil burning water heater]
Category

Application

Heating typeAir supply and exhaustand control system

Target standard
value (%)

Control method1)

For hot watersupplyInstantaneous type86.02)

Water storage type (rapid heating type)87.03)

Water storage type (others)

85.0

4)

For heating

Open type85.35)

Semi-enclosed type79.46)

Enclosed type

82.1

By ON-OFF control

87.0

Other than above

82.07)

Instantaneous type

Water storage type(rapid heating type)

8)
9)
10)

For bath

11)

Water storage type (others)

84.0

With a smoke pipe

75.0

Without a smoke pipe

61.0(3) Measuring method (see Attachment 5)[Gas burning space heater]
The energy consumption efficiency is calculated (as thermal efficiency) by subtracting "thecalorific value taken away by exhaust gas" from "the calorific value of consumed gas (input)"and dividing "the resulting difference" by "the calorific value of consumed gas (input)."
The method for measurement should be in accordance with the thermal efficiency test
stipulated in JIS S 2122 "Household Gas Heating Appliances."[Oil burning space heater]
The energy consumption efficiency is calculated (as thermal efficiency) by subtracting "thecalorific value taken away by exhaust gas" from "the calorific value of consumed oil (input)"and dividing "the resulting difference" by "the calorific value of consumed oil (input)."
The method for measurement should be in accordance with the thermal efficiency test
stipulated in JIS S 3031 "General Rules for Test Methods of Oil Burning Appliances."Incidentally, high calorific values should be used in thermal efficiency testing.
[Gas cooking appliance]
The energy consumption efficiency of cooking stoves, cooking stoves with a gas grill, andparts of cooking stoves of gas ranges are calculated (as thermal efficiency) by dividing "thequantity of heat acquired by water contained in a testing kettle" by "the calorific value ofconsumed gas (input)."
The method for measurement should be in accordance with the thermal efficiency test forcooking stoves stipulated in JIS S 2103 "Household Gas cooking appliances."5

[Gas burning water heater]
1) Instantaneous gas water heater
The energy consumption efficiency is calculated (as thermal efficiency) by dividing "thequantity of heat acquired by outlet water (i.e., outlet water temperature minus feed watertemperature multiplied by quantity of outlet water)" by "the calorific value of consumedgas (input)."
The method for measurement should be in accordance with the thermal efficiency
stipulated in JIS S 2109 "Household Gas burning water heaters."2) Bath tub gas water heater (without a hot water supply)
The energy consumption efficiency is calculated (as thermal efficiency) by dividing "thequantity of heat acquired by bath tub water (i.e., final water temperature in the bath tub
minus initial water temperature in the bath tub multiplied by quantity of bath tub water)"by "the calorific value of consumed gas (input)."
The method for measurement should be in accordance with the thermal efficiency of baths
stipulated in JIS S 2109 "Household Gas burning water heaters."3) Bath tub gas water heater (with a hot water supply)
The energy consumption efficiency is calculated as a weighted average using weights of 1for parts of bath and 3.3 for parts of hot water supply.
The energy consumption efficiencies of parts of hot water supply and parts of bath andtheir measuring method are as follows:ａ）Part of hot water supply
Same as instantaneous gas water heatersｂ）Part of bath
Same as bath tub gas water heaters (without a hot water supply)[Oil burning water heater]
The energy consumption efficiency of oil burning water heaters and its measuring method,classified by functions of appliances, are as follows. If an appliance has two or more functions,the energy consumption efficiency and measuring method for the main function should beused.
Incidentally, high calorific values should be used in higher heating measurement.
1) For hot water supply
The energy consumption efficiency is calculated (as thermal efficiency) by dividing "thecontinuous hot water supply output (i.e., the quantity of heat acquired by outlet water =outlet water temperature minus feed water temperature multiplied by quantity of feedwater)" by "the calorific value of consumed oil (input)."
The method for measurement should be in accordance with the continuous hot watersupply efficiency stipulated in JIS S 3031 "General Rules for Test Methods of Oil Burning
Appliances."2) For heating
The energy consumption efficiency is calculated (as thermal efficiency) by dividing "theheating output (i.e., the quantity of heat acquired by heating water = outlet heating watertemperature minus return temperature multiplied by quantity of circulating heating water)"by "the calorific value of consumed oil (input)."
6The method for measurement should be in accordance with the heating efficiency
stipulated in JIS S 3031 "General Rules for Test Methods of Oil Burning Appliances."
3) For bath
The energy consumption efficiency is calculated (as thermal efficiency) by dividing "thequantity of heat acquired by bath tub water (i.e., final water temperature in the bath tub
minus initial water temperature in the bath tub multiplied by quantity of bath tub water)"by "the calorific value of consumed oil (input)."
The method for measurement should be in accordance with the water heating efficiency
stipulated in JIS S 3031 "General Rules for Test Methods of Oil Burning Appliances.
(4) Indicating method
1) Items to be indicated are as follows.
・Product name or model name・Category name・Fuel consumption
・Energy consumption efficiency
・Name of manufacturer or the likeNote:・Of the items to be indicated, the category name does not apply to gas burning spaceheaters, which are not classified into categories.
・Fuel consumption needs to be indicated only for semi-enclosed, natural convection orforced convection type oil burning space heaters.
・The name of a manufacturer or the like may be substituted by a registered trademark thathas been reported to a minister or an abbreviated designation approved by a minister if
this is permitted by provisions of the Gas Enterprise Law, the Law Concerning Safety
and Proper Trading of Liquefied Petroleum Gas, or other applicable laws.
2) Indicate energy consumption efficiency up to the first decimal place.
3) Indicate the above items indelibly in an easily viewable place on catalogs containing
performance data and on the body of gas and oil appliances or indicate them on a metal orsynthetic resin label attached securely to an easily viewable place on the body.
Together with the energy consumption efficiency of a given appliance, the energy
consumption efficiency of each burner should be indicated on catalogs in the case of gas
cooking stoves with two or more burners and the energy consumption efficiencies of parts of
hot water supply and parts of bath should be indicated on catalogs in the case of bath tub gas
water heaters (with a hot water supply).
3.

Recommendations for Energy Saving(1) Users' Efforts
Users should try to select products with high energy consumption efficiency and appropriate
capacity when purchasing gas or oil appliances and make efforts to save energy by using gas
or oil appliances in an appropriate and efficient manner.
(2) Efforts by manufacturers and the like
1) Manufacturers and the like should make efforts to promote technology development for7

energy saving of gas and oil appliances and to develop products with high energy
consumption efficiency.
2) Manufacturers and the like should make efforts to gain users' understanding to promotewidespread use of gas and oil appliances with high energy consumption efficiency.
3) Manufacturers and the like should make efforts for technology development to reduce thepower consumption of gas and oil appliances.
4) Manufacturers and the like should make efforts to improve efficiency, taking into
consideration the actual use of gas and oil appliances.
(3) Government's efforts
In order to promote widespread use of gas and oil appliances with high energy consumption
efficiency, the government should try to gain users' understanding and encourage
manufacturers' efforts by taking necessary measures such as political assistance andencouragement of widespread use.
4. Others
During the deliberation, careful consideration was given to the fact that the room for
improvement of efficiency was restricted by measures for maintaining the safety of appliances
Circumstances leading to organization of sub-committee (See Attachment 6)
Committee member list (See Attachment 7)8