- Shell: Drawn steel w/ epoxy finish
- Diaphragm: Butyl rubber
- Connection: 1/2" MNPT
- Max. Working Pressure: 100 PSI
- Max. Working Temp: 240 F
- Pre-Charge (adjustable): 12 PSI
Our HET series tanks are diaphragm type, hydro-pneumatic tanks designed for pressure control of residential and commercial hydronic heating systems. A pre-charged air chamber allows for system water expansion. The air charge is controlled via a charging valve located on the top or bottom of the tank NOTE: These tanks are NOT to be used on open or potable (domestic) water systems.