The Series HX-355 (50 W/in2) Heatrex circulation heaters are designed for heating water. These high quality Water Heaters include the following standard features :
Copper sheathed .475" diameter heating elements
Insulated steel vessel with a galvanized jacket
NEMA Type 1 terminal enclosure
Built-on thermostat, 60-250°F range
Choice of mounting brackets or mounting pads
Flange heaters have class 150 steel flanges which meet ANSI B16.5 standards