Specifications

90
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Potable Water Expansion Tank Sizing Charts
Supply
Pressure (psig)
WATER HEATER CAPACITY (U.S. gal)
20 30 40 50 60 80 100 120 150 175 200
40 8 8 8 8 8 18 18 18 35 35 35
50 8 8 8 8 8 18 18 18 35 35 35
55 8 8 8 8 8 18 18 18 35 35 35
60 8 8 8 8 18 18 18 18 35 35 35
70 8 8 8 18 18 18 18 35 35 35 35
80 8 8 18 18 18 18 35 35 35 35 35
90 8 18 18 18 18 35 35 35 35
100 18 18 18 18 35 35 35
110 18 18 35 35 35
120 35 35 35
Supply
Pressure (psig)
WATER HEATER CAPACITY (U.S. gal)
20 30 40 50 60 80 100 120 150 175 200
90 50V 50V
100 50V 50V 50V 50V
110 50V 50V 50V 50V 75V 75V
120 50V 50V 50V 50V 50V 120V 120V 120V
240 260 280 300 350 400 450 500 600 800 1000
40 50V 50V 75V 75V 75V 120V 120V 165V
50 50V 50V 75V 75V 75V 120V 120V 165V
55 50V 50V 75V 75V 75V 120V 120V 165V
60 50V 50V 50V 75V 75V 75V 120V 120V 165V
70 50V 50V 50V 50V 50V 75V 75V 75V 120V 120V 165V
80 50V 50V 50V 50V 75V 75V 75V 120V 120V 165V 165V
90 50V 50V 75V 75V 75V 120V 120V 120V 120V 165V 320V
100 75V 75V 75V 120V 120V 120V 120V 165V 165V 320V 320V
110 120V 120V 120V 120V 165V 165V 165V 320V 320V 320V X
120 165V 165V 165V 320V 320V 320V 320V 320V X X X
Supply
Pressure (psig)
WATER HEATER CAPACITY (U.S. gal)
20 30 40 50 60 80 100 120 150 175 200
40 WTTA-5 5 5 5 5 5 5 5 12 12 12
50 5 5 5 5 5 5 5 5 12 12 20
55 5 5 5 5 5 5 5 5 12 12 20
60 5 5 5 5 5 5 5 12 12 20 20
70 5 5 5 5 5 5 5 12 20 20 20
80 5 5 5 5 5 5 12 12 20 20 30
90 5 5 5 5 5 12 12 20 20 30 30
100 5 5 5 5 12 20 20 20 30 30 30
110 5 5 12 12 20 20 30 30 30 42 42
240 260 280 300 350 400 450 500 600 800 1000
40 30 30 30 30 30 30 30 30 30 42 100
50 30 30 30 30 30 30 30 30 42 42 100
55 30 30 30 30 30 30 30 30 42 60 100
60 30 30 30 30 30 30 30 30 42 60 100
70 30 30 30 30 30 30 42 42 42 80 100
80 30 30 30 30 30 42 42 42 60 80 100
90 30 30 30 30 42 42 60 60 80 100 125
100 42 42 42 42 60 60 80 80 100 125 160
110 42 60 60 80 80 100 100 100 125 180 WTTA-210
Model XT
Model WXTP
Model WTTA
= Use Model WXTP Based upon 100° temperature rise (40° F to 140° F)
= Use Model XT Based upon 100° temperature rise (40° F to 140° F)
Tank pressure to match water inlet pressure.
Sizing for heating from 40° F to 140° F
Maximum pressure 135 psi
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