Water Heater Brochure

Flow rate is determined by temperature rise. To determine your temperature rise, subtract the incoming water temperature from the set output temperature.
All units are factory set to 120°F or 122°F but can be changed.
Temperature Rise vs. Gallons per Minute
Temp Rise 110U 310U/C 510U/C 140H 240H 340H 540H/P/X3 CT-199 910
30° 6.6 8.0 10.0 6.6 6.6 8.0 10.0 10.0 14.5
35° 6.6 8.0 9.3 6.4 6.6 8.0 10.0 10.0 14.5
40° 5.7 7.8 8.1 5.6 6.6 8.0 9.5 9.5 14.5
45° 5.1 6.9 7.2 5.0 6.6 7.6 8.4 8.4 13.5
50° 4.6 6.2 6.5 4.5 6.1 6.8 7.6 7.6 12.2
55° 4.2 5.7 5.9 4.1 5.5 6.2 6.9 6.9 11.1
60° 3.8 5.2 5.4 3.7 5.1 5.7 6.3 6.3 10.1
65° 3.5 4.8 5.0 3.4 4.7 5.3 5.8 5.8 9.4
70° 3.3 4.4 4.7 3.2 4.3 4.9 5.4 5.4 8.7
75° 3.1 4.1 4.3 3.0 4.1 4.6 5.0 5.0 8.1
80° 2.9 3.9 4.1 2.8 3.8 4.3 4.7 4.7 7.6
85° 2.7 3.7 3.8 2.6 3.6 4.0 4.4 4.4 7.2
90° 2.5 3.5 3.6 2.5 3.4 3.8 4.2 4.2 6.8
95° 2.4 3.3 3.4 2.3 3.2 3.6 4.0 4.0 6.4
100°
2.3 3.1 3.3 2.2 3.0 3.4 3.8 3.8 6.1
Example of Hunter Curves
for Sizing Large Applications
Comparison of Flow Rates vs.
Temperature Rise
400
375
350100
75
50
25
200
175
150
125
300
275
250
225 325
0
100
80
60
90
70
50
10
20
30
40
0
Fixture Units
Gallons Per Minute
Restaurants
Hospitals, Nursing Homes,
Dormitories, Hotels & Motels
Apartments & Houses
Office Buildings & Schools
Temperature Rise (°F)
Flow Rate (gpm)
140120100806040200
16
14
12
10
2
4
6
8
0
910 SERIES 510/510U/510C 540H/P/X3 and CT-199
340H SERIES 310/310U/310C
110/110U
240H SERIES
140H SERIES
FLOW RATE GUIDE
5