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Thermal Expansion Tanks
Specifications
Model
Number
Tank
Volume
(Gallons)
Max.
Accept.
Volume
(Gallons)
Diameter
(Inches)
Height
(Inches)
System
Connection
(NPTM)
Shipping
Weight
(lbs.)
ST-5 2.0 0.9 8 13
3
/4 5
ST-12 4.4 3.2 11 15
3
/4 9
Specifications
Model
Number
Diameter
(Inches)
Height
(Inches)
System
Connection
(NPTM)
Shipping
Weight
(lbs.)
ST-1 3.4 4 1/2 1
Specifications
Model
Number
Tank
Volume
(Gallons)
Max.
Accept.
Volume
(Gallons)
Diameter
(Inches)
Height
(Inches)
System
Connection
(NPTF)
Shipping
Weight
(lbs.)
ST-25V 10.3 10.3 15 19
3
/4 23
ST-30V 14.0 11.3 15 24
3
/4 25
ST-42V 20.0 11.3 15 32
3
/4 33
ST-60V 34.0 34.0 22 30 1
1
/4 61
ST-80V 44.0 34.0 22 36 1
1
/4 69
ST-180V 62.0 34.0 22 47 1
1
/4 92
ST-200V 81.0 34.0 22 56 1
1
/4 103
ST-210V 86.0 46.0 26 47 1
1
/4 123
Therm-X-Trol In-Line Models
• 7-Year limited warranty: The industry's longest.
• Maintains safe expansion pressure in hot water systems as
required by most building codes and warranties.
• 50 PSI factory precharge; The industry's highest.
• InSight
®
Indicator Cap, Antimicrobial Liner
™
and Turbulator
™
.
Therm-X-Trol
®
for Tankless and POU
• Accepts expanded water as system temperature rises and returns
hot water to system when demand occurs.
• Patented air cell eliminates pressure surge to protect heat exchanger.
• Required by most building codes and all water heater warranties.
• 7-Year limited warranty: The industry's longest.
Therm-X-Trol Vertical Models
• Designed for large residential and light commercial (non-ASME) applications.
• Visit amtrol.com for sizing information.
• 1-Year limited warranty.
Stainless Steel System Connection.
Maximum Operating Temperature: 200°F. Maximum Working Pressure: 150 psig.
Factory Precharge: 50 psig.
Stainless Steel Waterway.
Maximum Intermittent Temperature: 180°F. Maximum Working Pressure: 150 psig.
Stainless Steel System Connection.
Maximum Operating Temperature: 200°F. Maximum Working Pressure: 150 psig
Factory Precharge: 40 psig.
THERM-X-TROL
Expansion Tank
Hot Water
T & P
Valve
Water
Heater
Cold
Water
Supply
Backflow Preventer
Check Valve or
Pressure Reducing Valve
THERM-X-TROL
Expansion Tank
Cold
Water
Supply
Backflow Preventer
Check Valve or
Pressure Reducing Valve
Hot Water
T & P
Valve
Water
Heater
ST-1
THERM-X-TROL
Hot Water
T & P
Relief
Valve
Cold
Water
Supply
Backflow Preventor
Check Valve or
Pressure Reducing Valve
Tankless
Water
Heater