ASHRAE-90.1-2022- - Page 141

Extracted Content

Table 7.4-1 Performance Requirements for Water-Heating Equipment—Minimum Efficiency Requirements

Equipment Type	Size Category (Input)	Subcategory or Rating Condition	Performance Required a	Test Procedureb,c
Electric table-top water heaters	12_kW_	<4000 (Btu/h)/gal 20 gal and120 gal	For applications outside U.S., see footnote (h). For U.S. applications, see footnote (g).	10 CFR 430 Appendix E
Electric storage water heaters	12_kW_	<4000 (Btu/h)/gal 20 gal and55 gal	For applications outside U.S., see footnote (h). For U.S. applications, see footnote (g).	10 CFR 430 Appendix E
Electric storage water heaters	12_kW_	<4000 (Btu/h)/gal >55 gal and120 gal	For applications outside U.S., see footnote (h). For U.S. applications, see footnote (g).	10 CFR 430 Appendix E
Electric storage water heaters	>12_kW_	<4000 (Btu/h)/gal	SL  0.3 + 27/Vm %/h	10 CFR 431.106
Electric instantaneous_water_ heaters	12_kW_	4000 (Btu/h)/gal <2 gal	For applications outside US, see footnote (h). For US applications, see footnote (g).	10 CFR 430 Appendix E
Electric instantaneous_water_ heaters	>12_kW_ and 58.6_kW_ c	4000 (Btu/h)/gal 2 gal 180°F	Very small DP: UEF = 0.80 Low DP: UEF = 0.80 Medium DP: UEF = 0.80 High DP: UEF = 0.80	10 CFR 430 Appendix E
Electric instantaneous_water_ heaters	58.6_kW_ c	4000 (Btu/h)/gal <10 gal	No requirement	No requirement
Electric instantaneous_water_ heaters	58.6_kW_ c	4000 (Btu/h)/gal 10 gal	No requirement	No requirement
Gas storage water heaters	75,000 Btu/h	<4000 (Btu/h)/gal 20 gal and55 gal	For applications outside U.S., see footnote (h). For U.S. applications, see footnote (g).	10 CFR 430 Appendix E
Gas storage water heaters	75,000 Btu/h	<4000 (Btu/h)/gal >55 gal and100 gal	For applications outside U.S., see footnote (h). For U.S. applications, see footnote (g).	10 CFR 430 Appendix E
Gas storage water heaters	>75,000 Btu/h and 105,000 Btu/h d	<4000 (Btu/h)/gal 120 gal 180°F	Very small DP: UEF = 0.2674 – (0.0009 ×Vr) Low DP: UEF = 0.5362 – (0.0012 ×Vr) Medium DP: UEF = 0.6002 – (0.0011 ×Vr) High DP: UEF = 0.6597 – (0.0009 ×Vr)	10 CFR 430 Appendix E
Gas storage water heaters	>105,000 Btu/h d,f	<4000 (Btu/h)/gal	80%_Et _ SL(Q/800 + 110 ), Btu/h V	10 CFR 431.106
Gas instantaneous water heaters	>50,000 Btu/h and 200,000 Btu/h	4000 (Btu/h)/gal <2 gal	For applications outside U.S., see footnote (h). For U.S. applications, see footnote (g).	10 CFR 430 Appendix E
Gas instantaneous water heaters	200,000 Btu/h d,f	4000 (Btu/h)/gal <10 gal	80%Et	10 CFR 431.106
Gas instantaneous water heaters	200,000 Btu/h f	4000 (Btu/h)/gal 10 gal	80%Et SL(Q/800 + 110 ), Btu/h V	80%Et SL(Q/800 + 110 ), Btu/h V
a. Thermal_efficiency_ (Et) is a minimum requirement, while standby loss is a maximum requirement. In the standby loss equation,V is the rated volume in gallons and_Q_ is the name- plate input rate in Btu/h.Vm is the measured volume in the tank in gallons. Standby loss for electric water heaters is in terms of %/h and denoted by the term “S,” and standby loss for gas and oil water heaters is in terms of Btu/h and denoted by the term “SL.” Draw pattern (DP) refers to the water draw profile in the uniform_energy factor_ (UEF) test. UEF and_energy factor_ (EF) are minimum requirements. In the UEF standard equations,Vr refers to the rated volume in gallons. b. Section 13 contains a complete specification, including the year version, of the referenced test procedure. c. Electric instantaneous water heaters with input capacity >12 kW and58.6 kW must comply with the requirements for the 58.6 kW if the water heater either (1) has a storage volume >2 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power. d. Gas storage water heaters with input capacity >75,000 Btu/h and105,000 Btu/h must comply with the requirements for the >105,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power e. Oil storage water heaters with input capacity >105,000 Btu/h and140,000 Btu/h must comply with the requirements for the >140,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power f. Refer to Section 7.5.3 for additional requirements for gas storage and instantaneous_water heaters_ and gas_hot-water supply boilers_. g. Water heaters or gas_pool_ heaters in this category or subcategory are regulated as consumer products by the U.S. DOE as defined in 10 CFR 430. h. Where this standard is being applied to a building outside the U.S. and Canada and water heaters in this subcategory are being installed in that building, those water heaters shall meet the local efficiency requirements. If there are no local efficiency standards for residential water heaters, consideration should be given to using the U.S. DOE efficiency require- ments shown in Informative Appendix F, Table F-2.	a. Thermal_efficiency_ (Et) is a minimum requirement, while standby loss is a maximum requirement. In the standby loss equation,V is the rated volume in gallons and_Q_ is the name- plate input rate in Btu/h.Vm is the measured volume in the tank in gallons. Standby loss for electric water heaters is in terms of %/h and denoted by the term “S,” and standby loss for gas and oil water heaters is in terms of Btu/h and denoted by the term “SL.” Draw pattern (DP) refers to the water draw profile in the uniform_energy factor_ (UEF) test. UEF and_energy factor_ (EF) are minimum requirements. In the UEF standard equations,Vr refers to the rated volume in gallons. b. Section 13 contains a complete specification, including the year version, of the referenced test procedure. c. Electric instantaneous water heaters with input capacity >12 kW and58.6 kW must comply with the requirements for the 58.6 kW if the water heater either (1) has a storage volume >2 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power. d. Gas storage water heaters with input capacity >75,000 Btu/h and105,000 Btu/h must comply with the requirements for the >105,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power e. Oil storage water heaters with input capacity >105,000 Btu/h and140,000 Btu/h must comply with the requirements for the >140,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power f. Refer to Section 7.5.3 for additional requirements for gas storage and instantaneous_water heaters_ and gas_hot-water supply boilers_. g. Water heaters or gas_pool_ heaters in this category or subcategory are regulated as consumer products by the U.S. DOE as defined in 10 CFR 430. h. Where this standard is being applied to a building outside the U.S. and Canada and water heaters in this subcategory are being installed in that building, those water heaters shall meet the local efficiency requirements. If there are no local efficiency standards for residential water heaters, consideration should be given to using the U.S. DOE efficiency require- ments shown in Informative Appendix F, Table F-2.	a. Thermal_efficiency_ (Et) is a minimum requirement, while standby loss is a maximum requirement. In the standby loss equation,V is the rated volume in gallons and_Q_ is the name- plate input rate in Btu/h.Vm is the measured volume in the tank in gallons. Standby loss for electric water heaters is in terms of %/h and denoted by the term “S,” and standby loss for gas and oil water heaters is in terms of Btu/h and denoted by the term “SL.” Draw pattern (DP) refers to the water draw profile in the uniform_energy factor_ (UEF) test. UEF and_energy factor_ (EF) are minimum requirements. In the UEF standard equations,Vr refers to the rated volume in gallons. b. Section 13 contains a complete specification, including the year version, of the referenced test procedure. c. Electric instantaneous water heaters with input capacity >12 kW and58.6 kW must comply with the requirements for the 58.6 kW if the water heater either (1) has a storage volume >2 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power. d. Gas storage water heaters with input capacity >75,000 Btu/h and105,000 Btu/h must comply with the requirements for the >105,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power e. Oil storage water heaters with input capacity >105,000 Btu/h and140,000 Btu/h must comply with the requirements for the >140,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power f. Refer to Section 7.5.3 for additional requirements for gas storage and instantaneous_water heaters_ and gas_hot-water supply boilers_. g. Water heaters or gas_pool_ heaters in this category or subcategory are regulated as consumer products by the U.S. DOE as defined in 10 CFR 430. h. Where this standard is being applied to a building outside the U.S. and Canada and water heaters in this subcategory are being installed in that building, those water heaters shall meet the local efficiency requirements. If there are no local efficiency standards for residential water heaters, consideration should be given to using the U.S. DOE efficiency require- ments shown in Informative Appendix F, Table F-2.	a. Thermal_efficiency_ (Et) is a minimum requirement, while standby loss is a maximum requirement. In the standby loss equation,V is the rated volume in gallons and_Q_ is the name- plate input rate in Btu/h.Vm is the measured volume in the tank in gallons. Standby loss for electric water heaters is in terms of %/h and denoted by the term “S,” and standby loss for gas and oil water heaters is in terms of Btu/h and denoted by the term “SL.” Draw pattern (DP) refers to the water draw profile in the uniform_energy factor_ (UEF) test. UEF and_energy factor_ (EF) are minimum requirements. In the UEF standard equations,Vr refers to the rated volume in gallons. b. Section 13 contains a complete specification, including the year version, of the referenced test procedure. c. Electric instantaneous water heaters with input capacity >12 kW and58.6 kW must comply with the requirements for the 58.6 kW if the water heater either (1) has a storage volume >2 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power. d. Gas storage water heaters with input capacity >75,000 Btu/h and105,000 Btu/h must comply with the requirements for the >105,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power e. Oil storage water heaters with input capacity >105,000 Btu/h and140,000 Btu/h must comply with the requirements for the >140,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power f. Refer to Section 7.5.3 for additional requirements for gas storage and instantaneous_water heaters_ and gas_hot-water supply boilers_. g. Water heaters or gas_pool_ heaters in this category or subcategory are regulated as consumer products by the U.S. DOE as defined in 10 CFR 430. h. Where this standard is being applied to a building outside the U.S. and Canada and water heaters in this subcategory are being installed in that building, those water heaters shall meet the local efficiency requirements. If there are no local efficiency standards for residential water heaters, consideration should be given to using the U.S. DOE efficiency require- ments shown in Informative Appendix F, Table F-2.	a. Thermal_efficiency_ (Et) is a minimum requirement, while standby loss is a maximum requirement. In the standby loss equation,V is the rated volume in gallons and_Q_ is the name- plate input rate in Btu/h.Vm is the measured volume in the tank in gallons. Standby loss for electric water heaters is in terms of %/h and denoted by the term “S,” and standby loss for gas and oil water heaters is in terms of Btu/h and denoted by the term “SL.” Draw pattern (DP) refers to the water draw profile in the uniform_energy factor_ (UEF) test. UEF and_energy factor_ (EF) are minimum requirements. In the UEF standard equations,Vr refers to the rated volume in gallons. b. Section 13 contains a complete specification, including the year version, of the referenced test procedure. c. Electric instantaneous water heaters with input capacity >12 kW and58.6 kW must comply with the requirements for the 58.6 kW if the water heater either (1) has a storage volume >2 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power. d. Gas storage water heaters with input capacity >75,000 Btu/h and105,000 Btu/h must comply with the requirements for the >105,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power e. Oil storage water heaters with input capacity >105,000 Btu/h and140,000 Btu/h must comply with the requirements for the >140,000 Btu/h if the water heater either (1) has a storage volume >120 gal; (2) is designed to provide outlet hot water at temperatures greater than 180°F; or (3) uses three-phase power f. Refer to Section 7.5.3 for additional requirements for gas storage and instantaneous_water heaters_ and gas_hot-water supply boilers_. g. Water heaters or gas_pool_ heaters in this category or subcategory are regulated as consumer products by the U.S. DOE as defined in 10 CFR 430. h. Where this standard is being applied to a building outside the U.S. and Canada and water heaters in this subcategory are being installed in that building, those water heaters shall meet the local efficiency requirements. If there are no local efficiency standards for residential water heaters, consideration should be given to using the U.S. DOE efficiency require- ments shown in Informative Appendix F, Table F-2.

ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 139