Caloritech™ CX domestic immersion heaters were developed as high quality replacements for the most commonly used heater types, The CXC is 2-1/2 in square flange with tinned copper sheath, elements are epoxy-coated to protect the heater from moisture and other contaminants that can lead to premature element failure. Developed as high quality replacements for the most commonly used heater types Elements are epoxy sealed to protect the heater from moisture and other contaminants which could lead to premature failure