[Code of Federal Regulations]
[Title 10, Volume 3]
[Revised as of January 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 10CFR431.102]

[Page 338-339]
 
                            TITLE 10--ENERGY
 
                    CHAPTER II--DEPARTMENT OF ENERGY
 
PART 431_ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL 
EQUIPMENT--Table of Contents
 
Subpart G_Commercial Water Heaters, Hot Water Supply Boilers and Unfired 
                         Hot Water Storage Tanks
 
Sec. 431.102  Definitions concerning commercial water heaters, hot water 
supply boilers, and unfired hot water storage tanks.

    The following definitions apply for purposes of this subpart G, and 
of subparts J through M of this part. Any words or terms not defined in 
this section or elsewhere in this part shall be defined as provided in 
section 340 of the Act, 42 U.S.C. 6311.
    ASTM-D-2156-80 means the test standard published in 1980 by the 
American Society of Testing and Measurements and titled Method for Smoke 
Density in Flue Gases from Burning Distillate Fuels.
    Hot water supply boiler means a packaged boiler that is industrial 
equipment and that,
    (1) Has an input rating from 300,000 Btu/hr to 12,500,000 Btu/hr and 
of at least 4,000 Btu/hr per gallon of stored water,
    (2) Is suitable for heating potable water, and
    (3) Meets either or both of the following conditions:
    (i) It has the temperature and pressure controls necessary for 
heating potable water for purposes other than space heating, or
    (ii) The manufacturer's product literature, product markings, 
product marketing, or product installation and

[[Page 339]]

operation instructions indicate that the boiler's intended uses include 
heating potable water for purposes other than space heating.
    Instantaneous water heater means a water heater that has an input 
rating not less than 4,000 Btu/hr per gallon of stored water, and that 
is industrial equipment, including products meeting this description 
that are designed to heat water to temperatures of 180 [deg]F or higher.
    Packaged boiler means a boiler that is shipped complete with heating 
equipment, mechanical draft equipment and automatic controls; usually 
shipped in one or more sections and does not include a boiler that is 
custom designed and field constructed. If the boiler is shipped in more 
than one section, the sections may be produced by more than one 
manufacturer, and may be originated or shipped at different times and 
from more than one location.
    R-value means the thermal resistance of insulating material as 
determined based on ASTM Standard Test Method C177-97 or C518-91 and 
expressed in ( [deg]F[middot]ft\2\[middot]h/Btu).
    Standby loss means the average hourly energy required to maintain 
the stored water temperature, expressed as applicable either (1) as a 
percentage (per hour) of the heat content of the stored water and 
determined by the formula for S given in Section 2.10 of ANSI Z21.10.3-
1998, denoted by the term ``S,'' or (2) in Btu per hour based on a 70 
[deg]F temperature differential between stored water and the ambient 
temperature, denoted by the term ``SL.''
    Storage water heater means a water heater that heats and stores 
water within the appliance at a thermostatically controlled temperature 
for delivery on demand and that is industrial equipment. Such term does 
not include units with an input rating of 4,000 Btu/hr or more per 
gallon of stored water.
    Tank surface area means, for the purpose of determining portions of 
a tank requiring insulation, those areas of a storage tank, including 
hand holes and manholes, in its uninsulated or pre-insulated state, that 
do not have pipe penetrations or tank supports attached.
    Thermal efficiency for an instantaneous water heater, a storage 
water heater or a hot water supply boiler means the ratio of the heat 
transferred to the water flowing through the water heater to the amount 
of energy consumed by the water heater as measured during the thermal 
efficiency test procedure prescribed in this subpart.
    Unfired hot water storage tank means a tank used to store water that 
is heated externally, and that is industrial equipment.

                             Test Procedures