ENERGY STAR Program Requirements
for Residential Water Heaters
Partner Commitments
Following are the terms of the ENERGY STAR Partnership Agreement as it pertains to the manufacture
and labeling of ENERGY STAR qualified products. The ENERGY STAR Partner must adhere to the
following partner commitments:
Qualifying Products	
1.	Comply with current ENERGY STAR Eligibility Criteria, which define performance requirements and
test procedures for residential water heaters. A list of eligible products and their corresponding
Eligibility Criteria can be found at
2.	Obtain certification of ENERGY STAR qualification from a Certification Body recognized by EPA for
residential water heaters prior to associating the ENERGY STAR name or mark with any product. As
part of this certification process, products must be tested in a laboratory recognized by EPA to perform
water heater testing.
Using the ENERGY STAR Name and Marks	
3.	Comply with current ENERGY STAR Identity Guidelines, which define how the ENERGY STAR name
and marks may be used. Partner is responsible for adhering to these guidelines and ensuring that its
authorized representatives, such as advertising agencies, dealers, and distributors, are also in
compliance. The ENERGY STAR Identity Guidelines are available at www.eneravstar.aov/loaouse.
4.	Use the ENERGY STAR name and marks only in association with qualified products. Partner may not
refer to itself as an ENERGY STAR Partner unless at least one product is qualified and offered for
5.	Provide clear and consistent labeling of ENERGY STAR qualified residential water heaters.
5.1.	The ENERGY STAR mark must be clearly displayed on the top/front of the product (on product
labels and/or as a permanent mark), in product literature (i.e., user manuals, spec sheets, etc.),
and on the manufacturer's Internet site where information about ENERGY STAR qualified models
is displayed.
5.2.	It is also recommended that the mark appear on the product packaging.
Verifying Ongoing Product Qualification	
6.	Participate in third-party verification testing through a Certification Body recognized by EPA for
residential water heaters.
7.	Comply with tests that EPA/DOE may conduct at its discretion on products that are referred to as
ENERGY STAR qualified. These products may be obtained on the open market, or voluntarily
supplied by Partner at the government's request.
Providing Information to EPA	
8. Provide unit shipment data or other market indicators to EPA annually to assist with creation of
ENERGY STAR market penetration estimates, as follows:
ENERGY STAR Program Requirements for Residential Water Heaters - Partner Commitments	1

8.1.	Partner must submit the total number of ENERGY STAR qualified residential water heaters
shipped in the calendar year or an equivalent measurement as agreed to in advance by EPA and
Partner. Partner shall exclude shipments to organizations that rebrand and resell the shipments
(unaffiliated private labelers).
8.2.	Partner must provide unit shipment data segmented by meaningful product characteristics (e.g.,
type, capacity, presence of additional functions) as prescribed by EPA.
8.3.	Partner must submit unit shipment data for each calendar year to EPA or an EPA-authorized third
party, preferably in electronic format, no later than March 1 of the following year.
Submitted unit shipment data will be used by EPA only for program evaluation purposes and will be
closely controlled. Any information used will be masked by EPA so as to protect the confidentiality of
the Partner;
9.	Report to EPA any attempts by laboratories or Certification Bodies (CBs) to influence testing or
certification results or to engage in discriminatory practices.
10.	Notify EPA of a change in the designated responsible party or contacts within 30 days using the My
ENERGY STAR Account tool (MESA) available at
Performance for Special Distinction	
In order to receive additional recognition and/or support from EPA for its efforts within the Partnership, the
ENERGY STAR Partner may consider the following voluntary measures, and should keep EPA informed
on the progress of these efforts:
¦	Provide quarterly, written updates to EPA as to the efforts undertaken by Partner to increase
availability of ENERGY STAR qualified products, and to promote awareness of ENERGY STAR and
its message.
¦	Consider energy efficiency improvements in company facilities and pursue benchmarking buildings
through the ENERGY STAR Buildings program.
¦	Purchase ENERGY STAR qualified products. Revise the company purchasing or procurement
specifications to include ENERGY STAR. Provide procurement officials' contact information to EPA for
periodic updates and coordination. Circulate general ENERGY STAR qualified product information to
employees for use when purchasing products for their homes.
¦	Feature the ENERGY STAR mark(s) on Partner website and other promotional materials. If
information concerning ENERGY STAR is provided on the Partner website as specified by the
ENERGY STAR Web Linking Policy (available in the Partner Resources section of the ENERGY
STAR website), EPA may provide links where appropriate to the Partner website.
¦	Ensure the power management feature is enabled on all ENERGY STAR qualified displays and
computers in use in company facilities, particularly upon installation and after service is performed.
¦	Provide general information about the ENERGY STAR program to employees whose jobs are relevant
to the development, marketing, sales, and service of current ENERGY STAR qualified products.
¦	Provide a simple plan to EPA outlining specific measures Partner plans to undertake beyond the
program requirements listed above. By doing so, EPA may be able to coordinate, communicate,
and/or promote Partner's activities, provide an EPA representative, or include news about the event in
the ENERGY STAR newsletter, on the ENERGY STAR website, etc. The plan may be as simple as
providing a list of planned activities or milestones of which Partner would like EPA to be aware. For
example, activities may include: (1) increasing the availability of ENERGY STAR qualified products by
converting the entire product line within two years to meet ENERGY STAR guidelines; (2)
demonstrating the economic and environmental benefits of energy efficiency through special in-store
displays twice a year; (3) providing information to users (via the website and user's manual) about
energy-saving features and operating characteristics of ENERGY STAR qualified products; and (4)
building awareness of the ENERGY STAR Partnership and brand identity by collaborating with EPA
on one print advertorial and one live press event.
ENERGY STAR Program Requirements for Residential Water Heaters - Partner Commitments	2

Join EPA's SmartWay Transport Partnership to improve the environmental performance of the
company's shipping operations. The SmartWay Transport Partnership works with freight carriers,
shippers, and other stakeholders in the goods movement industry to reduce fuel consumption,
greenhouse gases, and air pollution. For more information on SmartWay, visit
Join EPA's Climate Leaders Partnership to inventory and reduce greenhouse gas emissions. Through
participation, companies create a credible record of their accomplishments and receive EPA
recognition as corporate environmental leaders. For more information on Climate Leaders, visit
Join EPA's Green Power Partnership. EPA's Green Power Partnership encourages organizations to
buy green power as a way to reduce the environmental impacts associated with traditional fossil fuel-
based electricity use. The partnership includes a diverse set of organizations including Fortune 500
companies, small and medium businesses, government institutions as well as a growing number of
colleges and universities. For more information on Green Power, visit
ENERGY STAR Program Requirements for Residential Water Heaters - Partner Commitments

ENERGY STAR® Program Requirements
Product Specification for Residential Water Heaters
Eligibility Criteria
DRAFT Version 1.1
Following is the Version 1.1 product specification for ENERGY STAR qualified water heaters. A product shall
meet all of the identified criteria if it is to earn the ENERGY STAR.
1) Definitions: Below are the definitions of the relevant terms in this document.
A. Residential Water Heater: A product that utilizes oil, gas, or electricity to heat potable water for use outside
the heater upon demand, including:
a.	Storage type units which heat and store water at a thermostatically controlled temperature, including:
gas storage water heaters with an input of 75,000 British thermal units (Btu) per hour or less; oil
storage water heaters with an input of 105,000 Btu per hour or less; and electric storage water heaters
with an input of 12 kilowatts or less. Gas condensing products are defined as storage-type units in
which the flue gases condense and the thermal energy is used to help heat the water.
b.	Tankless (or "instantaneous") type units which heat water but contain no more than one gallon of
water per 4,000 Btu per hour of input, including: gas instantaneous water heaters with an input of
200,000 Btu per hour or less; oil instantaneous water heaters with an input of 210,000 Btu per hour or
less; and electric instantaneous water heaters with an input of 12 kilowatts or less.
c.	Heat pump type units, with a maximum current rating of 24 amperes at a voltage no greater than 250
volts and designed to transfer thermal energy from one temperature level to a higher temperature level
for the purpose of heating water, including all ancillary equipment such as fans, storage tanks, pumps,
or controls necessary for the device to perform its function.
d.	Solar type units which have received an OG-300 rating from the Solar Rating and Certification
B.	Energy Factor: Energy Factor ("EF") is the ratio of useful energy output from the water heater to the total
amount of energy delivered to the water heater.
C.	Solar Fraction: Solar Fraction ("SF") is the portion of the total conventional hot water heating load
(delivered energy and standby losses) provided by solar energy.
D.	First-Hour Rating: The First-Hour Rating ("FHR") is the amount of hot water in gallons a storage water
heater can supply per hour (starting with a tank full of hot water).
E.	Gallons per Minute: Gallons per Minute ("GPM") is the amount of hot water in gallons a tankless water
heater can supply per minute over a 77°F rise.
F.	Manufacturer Limited Warranty: Manufacturer limited warranty is an assurance by the manufacturer to the
consumer that the water heater, including purchased system equipment and components, are guaranteed
to work for a defined period of time.
G.	Product Family: A group of models sufficiently similar that the energy performance of all members may be
predicted from the energy performance of a platform model. Generally, this will be a single product sold
under multiple trade names by the manufacturer. In other cases, a Product Family may be used for
qualifying a single gas water heater that can utilize either natural gas or propane as the main fuel source.
A Product Family cannot be used to obtain ENERGY STAR qualification status for unique models.
ENERGY STAR Program Requirements for Residential Water Heaters - Eligibility Criteria	1

2)	Scope:
A.	Included Products: Only products that meet the definition of a residential water heater, as specified herein,
and which are of the gas storage, gas condensing, heat pump products in the "drop in" or "integrated"
configuration, gas tankless, or solar type are eligible for ENERGY STAR qualification.
B.	Excluded Products: Electric resistance water heaters, commercial sized products, add-on heat pump
water heaters, and combination appliances that supply both space and water heating are not eligible for
3)	Qualification Criteria:
A. Product Performance Requirements:
Table 1: Gas Storage Requirements
First-Hour Rating
EF > 0.67
FHR > 67 gallons per
Warranty >
6 years on sealed
ANSI Z21.10.1/CSA 4.1
Table 2: Whole-Home Gas Tankless Requirements
Gallons-Per- Minute
EF> 0.82
GPM > 2.5 over a
77°F rise
Warranty >
10 years on heat
exchanger and 5 years
on parts
ANSI Z21.10.1/CSA 4.1 or
ANSI Z21.10.3/CSA 4.3,
depending on burner size
Table 3: Gas Condensing Requirements
First-Hour Rating
EF> 0.8
FHR > 67 gallons per
Warranty >
8 years on sealed
ANSI Z21.10.1/CSA 4.1
Table 4: Heat Pump Water Heater Requirements
First-Hour Rating
EF > 2.0
FHR > 50 gallons per
Warranty >
6 years on sealed
UL 174 and UL1995
ENERGY STAR Program Requirements for Residential Water Heaters - Eligibility Criteria	2

Table 5: Solar Water Heater Requirements
SF> 0.5
Warranty >
10 years on solar collector, 6 years
on storage tank, 2 years on controls
and 1 year for piping and parts.
OG-300 Certification from the SRCC.
B. Significant Digits and Rounding:
a.	All calculations shall be carried out with actual measured or observed values. Only the final result of a
calculation shall be rounded. Calculated results shall be rounded to the nearest significant digit as
expressed in the corresponding specification limit.
b.	Unless otherwise specified, compliance with specification limit shall be evaluated using exact values
without any benefit from rounding.
Note: Solar water heater results shall match published performance in the Solar Rating and Certification
Corporation (SRCC) directory.
4) Test Requirements:
A.	Representative Models shall be selected for testing per the following requirements:
a.	For qualification of an individual product model, the representative model shall be equivalent to that
which is intended to be marketed and labeled as ENERGY STAR.
b.	For qualification of a product family, the representative (i.e., platform) model shall not differ from any
other model within that product family in regards to efficiency characteristics.
B.	When testing residential water heaters, the following test methods shall be used to determine ENERGY
STAR qualification:
Table 6: Test Methods for ENERGY STAR Qualification
ENERGY STAR Requirement
Test Method Reference
Energy Factor
DOE Test Procedure found in 10CFR430, Subpart
B, Appendix E*
First Hour Rating
Gallons per minute
Solar Fraction
From SRCC OG-300, using the formula SF=(1-
EF/SEF), where the EF for electric auxiliary
products is 0.9 and the EF for gas auxiliary
products is 0.6
*Note on recovery efficiency: For thermostatically-controlled water heaters that do not completely recover or
do not undergo a recovery cycle prior to the start of the second draw of the simulated-use test, the recovery
efficiency shall be determined as specified in Section 11.2 of ASHRAE 118.2.
5) Effective Date: The ENERGY STAR Residential Water Heater specification shall take effect on January 1,
2009,	with the exception of gas storage products. The gas storage criteria shall take effect on September 1,
2010.	To qualify for ENERGY STAR, a product model shall meet the ENERGY STAR specification in effect on
the date of manufacture. The date of manufacture is specific to each unit and is the date (e.g., month and
year) on which a unit is considered to be completely assembled.
ENERGY STAR Program Requirements for Residential Water Heaters - Eligibility Criteria	3

6) Future Criteria Revisions: EPA reserves the right to change the specification should technological and/or
market changes affect its usefulness to consumers, industry, or the environment. In keeping with current
policy, revisions to the specification are arrived at through industry discussions. In the event of a specification
revision, please note that the ENERGY STAR qualification is not automatically granted for the life of a product
ENERGY STAR Program Requirements for Residential Water Heaters - Eligibility Criteria