Durex Industries DFX family of electric heat exchangers are designed to provide fast, safe and effective heating of liquids and gases without the drawbacks of traditional electric circulation heaters. Unlike traditional circulation heaters, the unit’s heater elements are isolated from the medium flow path. A coiled, seamless, 316 stainless steel flow tube is embedded with the heater elements in a light-weight aluminum casting. This provides rapid heat transfer and gentle, indirect heating that will not degrade fluid. This isolated-flow-path construction is ideal for heating de-ionized water, solvents, sterilization gases and other contamination-sensitive substances, the company says.