[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: 10CFR431.110]

[Page 341-342]
 
                            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. 431.110  Energy conservation standards and their effective dates.

    Each commercial storage water heater, instantaneous water heater, 
unfired hot water storage tank and hot water supply boiler \1\ must meet 
the applicable energy conservation standard level(s) as follows:

---------------------------------------------------------------------------

    \1\ Any packaged boiler that provides service water, that meets the 
definition of ``commercial packaged boiler'' in subpart E of this part, 
but does not meet the definition of ``hot water supply boiler'' in 
subpart G, must meet the requirements that apply to it under subpart E.

----------------------------------------------------------------------------------------------------------------
                                                                   Energy conservation standard \a\ (products
                                                                manufactured on and after October 29, 2003) \b\
              Product                          Size           --------------------------------------------------
                                                                    Minimum thermal        Maximum standby loss
                                                                      efficiency                   \c\
----------------------------------------------------------------------------------------------------------------
Electric storage water heaters....  All......................  N/A.....................  0.30 + 27/Vm (%/hr)
Gas-fired storage water heaters...  <=155,000 Btu/hr.........  80%.....................  Q/800 + 110(Vr) 1/2
                                    155,000 Btu/hr  80%.....................   (Btu/hr)
                                                                                         Q/800 + 110(Vr) 1/2
                                                                                          (Btu/hr)
Oil-fired storage water heaters...  <=155,000 Btu/hr.........  78%.....................  Q/800 + 110(Vr) 1/2
                                    155,000 Btu/hr  78%.....................   (Btu/hr)
                                                                                         Q/800 + 110(Vr) 1/2
                                                                                          (Btu/hr)
Gas-fired instantaneous water       <10 gal..................  80%.....................  N/A
 heaters and hot water supply       =10 gal.......  80%.....................  Q/800 + 110(Vr) 1/2
 boilers.                                                                                 (Btu/hr)
Oil-fired instantaneous water       <10 gal..................  80%.....................  N/A
 heaters and hot water supply       =10 gal.......  78%.....................  Q/800 + 110(Vr) 1/2
 boilers.                                                                                 (Btu/hr)
----------------------------------------------------------------------------------------------------------------


------------------------------------------------------------------------
                                                       Minimum thermal
           Product                     Size               insulation
------------------------------------------------------------------------
Unfired hot water storage      All.................  R-12.5
 tank.
------------------------------------------------------------------------
\a\ Vm is the measured storage volume and Vr is the rated volume, both
  in gallons. Q is the nameplate input rate in Btu/hr.
\b\ For hot water supply boilers with a capacity of less than 10
  gallons: (1) the standards are mandatory for products manufactured on
  and after October 21, 2005, and (2) products manufactured prior to
  that date, and on or after October 23, 2003, must meet either the
  standards listed in this table or the applicable standards in Subpart
  E of this Part for a ``commercial packaged boiler.''
\c\ Water heaters and hot water supply boilers having more than 140
  gallons of storage capacity need not meet the standby loss requirement
  if (1) the tank surface area is thermally insulated to R-12.5 or more,
  (2) a standing pilot light is not used and (3) for gas or oil-fired
  storage water heaters, they have a fire damper or fan assisted
  combustion.


[[Page 342]]


[69 FR 61983, Oct. 21, 2004; 69 FR 63574, Nov. 2, 2004]

Subparts H-I [Reserved]