A: The XT-18 tank capacity is 4.8 gal or 18 Liters. The XT-18 can handle up to a 175 gal water heater capacity at 130 deg F. The manufacturer recommends installation of the XT upstream of the water heater(s) on the cold water line.
A: The tank has a bladder in it & the bladder's air pressure is supposed to be set to one's normal water pressure. If one's water pressure raises, some water enters the tank and compresses the bladder. Zurn-Wilkins specifications for the XT-8 says tank volume 2.1 gallons & maximum acceptance volume 1.0 gallons, XT-18 says tank volume 4.8 gallons & maximum acceptance volume 2.4 gallons, & XT-35 says tank volume 9.0 gallons & maximum acceptance volume 4.25 gallons. All three have a maximum working pressure of 150psi
A: The capacity is 4.8 gallons.
A: No - tank says "Made in Taiwan" on the label.
A: No, label indicates the XT-18 is manufactured in Taiwan.