Industrial 12-H15 Hydronic Heating Safety Tank

BackStop 12-H15 Hydronic Expansion Tank is a diaphragm-type hydronic heating safety tank designed for residential or commercial closed-loop hot-water systems to absorb water expansion and keep system pressure below relief valve settings. This 12-H15 model has a 2.1-gallon capacity, stands about 12-1/2 inches tall with an 8-inch diameter, and features a 1/2-inch system connection with a ship weight of roughly 4.25 pounds. The tank uses a carbon steel shell with an FDA-grade polypropylene liner to keep the water from contacting the shell, helping protect water quality and durability. A Schrader valve at the bottom allows quick checking or adjustment of the tank’s air pre-charge to ensure proper operation.