AMTROLAMTRST5C AMTR-ST-5-C Thermal Expansion Tank 2.1 Gal

Product Description

The AMTROLAMTRST5C AMTR-ST-5-C is a 2.1-gallon ASME-rated thermal expansion tank designed to control pressure in commercial closed potable hot water systems. Built with a steel shell finished in red oxide primer and a polypropylene inner lining, the tank uses a heavy-duty butyl diaphragm to absorb system expansion and protect water heaters and plumbing fixtures from pressure surges. It arrives factory pre-charged at 55 PSIG and carries a pressure rating of 250 PSIG with a maximum temperature rating of 200 degrees F. A licensed plumber or mechanical contractor typically handles installation in commercial hydronic or domestic hot water systems.

This expansion tank is intended for commercial closed, potable hot water applications where pressure control and code compliance are required. Its ASME certification makes it suitable for jurisdictions that mandate code-stamped vessels on commercial domestic hot water systems. The inline design and 3/4-inch male threaded inlet and outlet connection fit standard piping configurations found in commercial water heater installations. The maximum acceptance volume is 0.9 gallon, sizing it for smaller commercial expansion control applications.

Key Features

• ASME-certified construction meets code requirements for commercial potable hot water systems
• NSF/ANSI 61 listed for contact with potable water
• Factory pre-charged at 55 PSIG — reduces field setup time
• Heavy-duty butyl diaphragm rated for repeated expansion cycles
• 3/16-inch Schrader valve with EPDM seat for field pressure adjustment
• Stainless steel system connection for corrosion resistance at the inlet and outlet
• Lead-free construction complies with applicable potable water standards

Compatibility

Designed for commercial closed, potable hot water systems requiring ASME-certified thermal expansion control. Consult the system expansion tank sizing chart to confirm this 2.1-gallon tank with a 0.9-gallon maximum acceptance volume is appropriate for the specific system pressure and volume requirements.

Installation Notes

Installation should be performed by a licensed plumber or mechanical contractor in accordance with the International Plumbing Code and applicable local amendments. Shut off the cold water supply and depressurize the system before making any connections. Verify the factory air pre-charge matches the system cold-water supply pressure before connecting the tank — adjust through the Schrader valve if necessary. Do not exceed the 250 PSIG pressure rating or 200 degrees F temperature rating of the tank.

Technical Specifications

• Tank Capacity: 2.1 gallons
• Maximum Acceptance Volume: 0.9 gallon
• Pressure Rating: 250 PSIG
• Air Charge (Factory Pre-Charged): 55 PSIG
• Temperature Rating: 200 degrees F
• Inlet/Outlet Connection: 3/4 inch male threaded
• Tank Dimensions: 10 inches diameter x 10 inches height
• Tank Material: Steel
• Tank Inner Lining: Polypropylene
• Diaphragm Type: Heavy-duty butyl
• Finish: Red oxide primer
• System Connection: Stainless steel
• Schrader Valve Seat: EPDM
• Certifications: ASME, NSF/ANSI 61, ISO 9001:2008
• Lead-Free: Yes
• Tank Warranty: 1 year
• Type: Inline
• Application: Commercial closed, potable hot water system

Standard Information

• Brand: AMTROLAMTRST5C
• Manufacturer Part Number: AMTR-ST-5-C