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Amtrol Therm-X-Trol
THERM-X-TROL® ST Series Thermal expansion occurs as domestic water is heated. Left unchecked, the resulting pressure increase can cause relief valve discharge and other potentially unsafe conditions. Therm-X-Trol® expansion tanks absorb this expanded water, keeping water pressure at a safe level. Available in diaphragm, full acceptance, and partial acceptance bladder designs, all Therm-X-Trol tanks are made in the USA at our ISO 9001:2008 registered facilities. ASME tanks meet Section VIII, Division I Standards.
SPECIFICATIONS ASME Diaphragm Series |
Model Number |
Tank Volume (Gallons) |
Maximum Acceptance Volume (Gallons) |
Diameter (Inches) |
Height (Inches) |
System Connection NPTF (Inches) |
Shipping Weight (lbs.) |
ST-5C |
2.1 |
0.9 |
10 |
10 |
3/4 |
20 |
ST-12C |
6.4 |
3.2 |
12 |
12 |
3/4 |
34 |
ST-20VC |
8.0 |
3.2 |
12 |
19 |
3/4 |
41 |
ST-30VC-150 |
14.0 |
9.0 |
16 |
19 |
3/4 |
59 |
ST-30VC-175 |
14.0 |
9.0 |
16 |
19 |
3/4 |
64 |
ST-42VC |
18.0 |
11.0 |
16 |
24 |
3/4 |
71 |
ST-60VC |
25.0 |
11.0 |
16 |
32 |
3/4 |
85 |
ST-70VC |
34.0 |
11.0 |
16 |
45 |
3/4 |
99 |
ST-80VC |
53.0 |
35.0 |
24 |
37 |
1-1/4 |
224 |
ST-180VC |
77.0 |
35.0 |
24 |
49 |
1-1/4 |
285 |
SPECIFICATIONS Non-ASME Diaphragm Series |
Model Number |
Tank Volume (Gallons) |
Maximum Acceptance Volume (Gallons) |
Diameter (Inches) |
Height (Inches) |
System Connection (Inches) |
Shipping Weight (lbs.) |
ST-12 |
4.4 |
3.2 |
11 |
15 |
3/4 NPTM |
9 |
ST-25V |
10.3 |
10.3 |
15 |
19 |
3/4 NPTF |
23 |
ST-60V |
34.0 |
34.0 |
22 |
30 |
1-1/4 NPTF |
61 |
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2 Gallon Volume - 3/4" NPTF Potable Water
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4.4 Gallon Volume - 3/4" NPTF Potable Water
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10.3 Gallon Volume - 3/4" NPTF Non-ASME
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20 Gallon Volume - 3/4" NPTF Non-ASME
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34.0 Gallon Volume - 1 1/4" NPTF Non-ASME
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44 Gallon Volume - 1 1/4" NPTF Non-ASME
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62 Gallon Volume - 1 1/4" NPTF Potable Water
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86 Gallon Volume - 1 1/4" NPTF Potable Water
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81 Gallon Volume - 1 1/4" NPTF Potable Water
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2 Gallon Volume - 3/4" NPTM ASME
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2 Gallon Volume - 3/4" NPTM ASME
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6.4 Gallon Volume - 150 PSI ASME
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2 Gallon Volume - 3/4" NPTF ASME
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8.6 Gallon Volume - 3/4" NPTM ASME
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6.4 Gallon Volume - 175 PSI ASME
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14 Gallon Volume - 3/4" NPTM ASME
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8.6 Gallon Volume - 3/4" NPTM ASME
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18 Gallon Volume - 3/4" NPTM - ASME
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34 Gallon Volume - 3/4" NPTF - ASME
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25 Gallon Volume - 3/4" NPTF ASME
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34 Gallon Volume - 3/4" NPTF - ASME
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10 Gallon Volume - 1" NPTF ASME
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13 Gallon Volume - 1" NPTF ASME
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53 Gallon Volume - 1 1/4" NTPF ASME
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68 Gallon Volume - 1 1/4" NPTF ASME
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77 Gallon Volume - 1 1/4" NPTF ASME
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53 Gallon Volume - 1 1/4" NTPF ASME
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90 Gallon Volume - 1 1/4" NPTF ASME
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