Rapid Response is a circulation heater for gases and other fluids. Applications include solvent replacement, fuel cell gas heating, gas heating, humidity generation, food processing and deionized water heating. It is designed around the company's Watrod electric heating element placed inside of a tube designed to accommodate process temperature and pressure. A range of fittings on the ends of the outer tube facilitates transition to both the fluid and electrical terminations. Integral temperature sensing can be custom-configured.