Therm-X-Trol ST-8 Thermal Expansion Tank (3.2 Gal Volume)
Amtrol ST-8 is 3.2 gallons In-Line Model of Therm-X-Trol searies expansion tank designed to control pressure build-up in closed, hot water systems. Equipped with the thickest diaphragm that provides extra strength and flexibility. Polypropylene tank liner provides 100% corrosion resistance and complies with NSF International Standard for clean and safe water storage.
Materials of Construction:
Warranty:5 years manufacturer's warranty.
Therm-X-Trol ST-8 Thermal Expansion Tank (3.2 Gal Volume) has an average 5 rating out of based on 1 user review.
I wanted this size as it is just slightly oversized for my needs...50 gal water heater and 60 psi pressure. I was seeing 75 psi avg and excursions up to 120 psi before I put in pressure regulator and expansion tank. Now I only see 60 psi avg and 70 psi peak.