CXC – Flange Heater (Copper Sheath, High Density) Suitable for water heating applications Caloritech™ CXC Flange Heaters are used primarily for water heating applications and feature copper sheathed elements silver brazed to a steel flange. CX - FLANGE HEATER CATALOG Posted in ELECTRIC HEATERS, Immersion, PRODUCTS and tagged Caloritech, CCI Thermal, Copper, Flange, Heater, High Density, Immersion, Water.