TABLE III
STANDARD RATING CONDITIONS AND MINIMUM PERFORMANCE
RATINGS FOR WATER HEATING EQUIPMENT
A.
STORAGE WATER HEATERS
STORAGE
CAPACITY
INPUT
FUEL
GALLONS
RATING
TEST PROCEDURE
REQUIRED PERFORMANCE
Elect.
120 max
12 kW max
10 CFR 430
EF = 0.95-0.00132V
minimum
Elect.
120 min
OR
12 kW min
ASHRAE 90.1
SL = 1.9 W/sq. ft.
(Addenda 90.1b)
maximum
Gas
100 max
75,000 Btu/h
10 CFR 430
EF = 0.62-0.0019V
max
minimum
Gas
100 min
OR
75,000 Btu/h
ANSI Z21.10.3
ET = 77 percent;
min
SL = 1.3+38/V
maximum
Oil
50 max
105,000 Btu/h 10 CFR 430
EF = 0.59-0.0019V
max
minimum
Oil
51 min
OR
105,000 Btu/h 10 CFR 430
EC = 83 percent;
min
SL = 1.3+38/V
maximum
B.
UNFIRED HOT WATER STORAGE, instantaneous water heater, and pool heater.
All volumes and inputs:
maximum HL shall be 6.5 Btu/h/sq. ft.
C.
INSTANTANEOUS WATER HEATER
Gas
All
ALL
ANSI Z21.10.3
ET = 80 percent
Oil
All
ALL
ANSI Z21.10.3
EC = 83 percent
D.
POOL HEATER
Gas or
All
ALL
ANSI Z21.56
ET = 78 percent
Oil
TERMS:
EF = Energy factor, overall efficiency.
ET = Thermal efficiency with 70 degrees F delta T.
EC = Combustion efficiency, 100 percent - flue loss when smoke = 0
(trace is permitted).
SL = Standby loss in W/sq. ft. based on 80 degrees F delta T, or in
percent per hour based on nominal 90 degrees F delta T.
HL = Heat loss of tank surface area
V = Storage volume in gallons.
-- End of Section --
SECTION 15405A
Page 118
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