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/ 80%................... (Btu/hr)
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/ 78%................... (Btu/hr)
hr. Q/800 + 110(Vr) \1/2\
(Btu/hr)Gas-fired instantaneous water heaters <10 gal................ 80%................... N/A
and hot water supply boilers. =10 gal..... 80%................... Q/800 + 110(Vr) \1/2\
(Btu/hr)Oil-fired instantaneous water heaters <10 gal................ 80%................... N/A
and hot water supply boilers. =10 gal..... 78%................... Q/800 + 110(Vr) \1/2\
(Btu/hr)---------------------------------------------------------------------------------------------------------------- ------------------------------------------------------------------------
Minimum thermal
Product Size insulation------------------------------------------------------------------------Unfired hot water storage tank..... All.............. R-12.5------------------------------------------------------------------------\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. [69 FR 61983, Oct. 21, 2004; 69 FR 63574, Nov. 2, 2004]