* * * * *
(b) * * *
Table 2 to Sec. 431.106--Test Procedures for Commercial Water Heaters and Hot Water Supply Boilers
[Other Than Commercial Heat Pump Water Heaters]----------------------------------------------------------------------------------------------------------------
Test procedure
Energy required for With these
Equipment type efficiency Test procedure compliance on and additional
descriptor after stipulations----------------------------------------------------------------------------------------------------------------Residential-Duty Commercial Uniform Energy 10 CFR Part 430, December 31, 2015***.. None.
Water Heater. Factor. Subpart B,
Appendix E.
Gas-fired Storage and Thermal Use test set-up, May 13, 2013.......... A. For all
Instantaneous Water Heaters Efficiency. equipment, and products, the
and Hot Water Supply Boilers*. procedures in duration of the
subsection standby loss
labeled ``Method test shall be
of Test'' of until whichever
ANSI Z21.10.3- of the following
2011**, Exhibit occurs first
G1. after you begin
to measure the
fuel and/or
electric
consumption: (1)
The first cut-
out after 24
hours or (2) 48
hours, if the
water heater is
not in the
heating mode at
that time.
Standby Loss..... Use test set-up, May 13, 2013.......... B. For oil and
equipment, and gas products,
procedures in the standby loss
subsection in Btu per hour
labeled ``Method must be
of Test'' of calculated as
ANSI Z21.10.3- follows: SL (Btu
2011**, Exhibit per hour) = S (%
G2. per hour) x 8.25
(Btu/gal-F) x
Measured Volume
(gal) x 70
(degrees F).Oil-fired Storage and Thermal ANSI Z21.10.3- May 13, 2013.......... C. For oil-fired
Instantaneous Water Heaters Efficiency. 2011**, Exhibit May 13, 2013.......... products, apply
and Hot Water Supply Boilers*. Standby Loss..... G1. the following in
Use test set-up, conducting the
equipment, and thermal
procedures in efficiency and
subsection standby loss
labeled ``Method tests: (1)
of Test'' of Venting
ANSI Z21.10.3- Requirements--Co
2011**, Exhibit nnect a vertical
G2. length of flue
pipe to the flue
gas outlet of
sufficient
height so as to
meet the minimum
draft specified
by the
manufacturer.
(2) Oil Supply--
Adjust the
burner rate so
that: (a) The
hourly Btu input
rate lies within
2 percent
of the
manufacturer's
specified input
rate, (b) the
CO2 reading
shows the value
specified by the
manufacturer,
(c) smoke in the
flue does not
exceed No. 1
smoke as
measured by the
procedure in
ASTM-D2156-80
(reference for
guidance only,
see Sec.
431.104), and
(d) fuel pump
pressure lies
within 10 percent
of
manufacturer's
specifications.Electric Storage and Standby Loss..... Use test set-up, May 13, 2013.......... D. For electric
Instantaneous Water Heaters. equipment, and products, apply
procedures in the following in
subsection conducting the
labeled ``Method standby loss
of Test'' of test: (1) Assume
ANSI Z21.10.3- that the thermal
2011**, Exhibit efficiency (Et)
G2. of electric
water heaters
with immersed
heating elements
is 98 percent.
(2) Maintain the
electrical
supply voltage
to within
5 percent of the
center of the
voltage range
specified on the
water heater
nameplate. (3)
If the set up
includes
multiple
adjustable
thermostats, set
the highest one
first to yield a
maximum water
temperature in
the specified
range as
measured by the
topmost tank
thermocouple.
Then set the
lower
thermostat(s) to
yield a maximum
mean tank
temperature
within the
specified range.
E. Install water-
tube water
heaters as shown
in Figure 2,
``Arrangement
for Testing
Water-tube Type
Instantaneous
and Circulating
Water Heaters.''----------------------------------------------------------------------------------------------------------------* As to hot water supply boilers with a capacity of less than 10 gallons, these test methods become mandatory on
October 21, 2005. Prior to that time, you may use for these products either (1) these test methods if you rate
the product for thermal efficiency, or (2) the test methods in subpart E if you rate the product for
combustion efficiency as a commercial packaged boiler.
** Incorporated by reference, see Sec. 431.105.*** Because the statute permits use of a conversion factor until the later of December 31, 2015 or one year
after publication of a conversion factor final rule, DOE may amend the mandatory compliance date for use of
this amended test procedure, as necessary.