TABLE III
STANDARD RATING CONDITIONS AND MINIMUM PERFORMANCE
RATINGS FOR WATER HEATING EQUIPMENT
A.
STORAGE WATER HEATERS
STORAGE
CAPACITY
INPUT
FUEL
LITERS
RATING
TEST PROCEDURE
REQUIRED PERFORMANCE
Elect.
454 max
12 kW max
10 CFR 430
EF = 0.95-0.00132V
minimum
Elect.
454 min
OR
12 kW min
ASHRAE 90.1
SL = 20.45 W/sq. m
(Addenda 90.1b)
maximum
Gas
380 max
22 kW max
10 CFR 430
EF = 0.62-0.0019V
minimum
Gas
380 min
OR
22 kW min
ANSI Z21.10.3
ET = 77 percent;
SL = 1.3+38/V
maximum
Oil
190 max
30.8 kW max
10 CFR 430
EF = 0.59-0.0019V
minimum
Oil
190 min
OR
30.8 kW max
10 CFR 430
EC = 83 percent;
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 20.49 W/hr/sq. m.
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 21 degrees C
delta T.
EC = Combustion efficiency, 100 percent -
flue loss when smoke = 0
(trace is permitted).
SL = Standby loss in W/sq. m. based on 27
degrees C delta T, or in
percent per hour based on nominal 32
degree C delta T.
HL = Heat loss of tank surface area
V = Storage volume in liters
SECTION 15405A
Page 117
Previous Page
