Amtrol 141N43 Therm-X-Trol ST-12 Thermal Expansion Tank (4.4 Gal Volume)

Amtrol 141N43 Therm-X-Trol ST-12 Thermal Expansion Tank (4.4 Gal Volume)

Amtrol 141N43 Therm-X-Trol ST-12 Thermal Expansion Tank (4.4 Gal Volume) QR Code
Product Code: 141N43 UPC: 642031395672

Availability: In Stock

Weight:9.00 lb

Dimensions (L x W x H ): 17.00 x 12.00 x 12.00

Usually ships: 1 business days
4 or more $51.95
Qty: Add to Cart

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Amtrol ST-12 (Therm-X-Trol) is a water heater expansion tank, designed for use in domestic hot water heating systems to eliminate the potential hazards of water expansion.

Water heater expansion tank is commonly installed in a domestic hot water system that contains a backflow preventer, a check valve or a pressure reducing valve.


Amtrol ST-12 Advantages:

Eliminates the waste of energy and water, thus saving money;

Protects the water heater and plumbing fixtures from premauture failure;

Reduces potential safety hazards associated with thermal expansion;

Prevents a dangerous pressure build-up in the system;

Prevents the relief valve from going off;

Therm-X-Trol brand is the #1 choice of Professional Installers;


Amtrol ST-12 Specifications:

Factory pre-charged 40 psig;

System connection: 3/4" male threaded;

Stainless steel system connection;

Max. operating temperature: 200F;

Max. operating pressure: 150 psi;

Expansion tank volume: 4.4 gallons;

Max. acceptance factor: 0.73;

Height: 15";

Diameter: 11";

Shipping weight: 9 lbs;


Standards & Approvals:

NSF/ANSI 61®, IAPMO, SBCCI & City of Los Angeles listings.


Amtrol ST-12 Applications:

Residentail water heaters, laundromats, dormitories, office/apartment buildings, restaurants, etc.



5-year manufacturer's warranty.


Product Specs
Capacity (Gallons):4.4
Diameter (Inches):11"
Height (Inches):15.5
Max Accept. Factor:0.73
Max Pressure (PSI):150
Tank Volume:4.4 Gallons
Temperature Range (F):200°F MAX
Warranty:5-Year Limited Warranty
Weight (lbs):9 lbs
5 ( 5 / 5 )
Replaced 10 year old expansion tank and worked well as expected. Great price.

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