Amtrol THERM-X-TROL® Water Heater Expansion Tank ST-12, 4.4 Gallons

Thermal expansion occurs as domestic water is heated. Left unchecked, the resulting pressure increase can cause relief valve discharge and other potentially hazardous conditions. Therm-X-Trol® expansion tanks absorb this expanded water, keeping water pressure at a safe level.

Features:

• Antimicrobial liner neutralizes bacteria on contact
• Patent pending Turbulator™ water diffuser
• 50 psi precharge – the industry’s highest
• Deep drawn steel domes for 2X the strength of other tanks
• Thickest diaphragm for extra long life
• Hoop and groove design for added reliability
• Stainless steel system connection
• NSF 61 approved
• Meets CA and VT low lead standards
• Made in the USA

Water heater manufacturers and plumbing codes require the installation of an expansion control device if a backflow preventor, pressure reducing valve or check valve is installed in the domestic supply line. Therm-X-Trol satisfies all manufacturers’ requirements.