Designed primarily for the oil and gas exploration, power generation and chemical industries, Chromalox Small Tank Flange Heaters allow heating elements to be changed without draining the tank. Replaceable-style elements can be easily changed by one person with no special tooling required. This is ideal for smaller, critical system storage units that need to remain filled for continuous operation and storage. The model STFX is offered in multiple designs with varying watt densities, which allow it to meet a variety of needs in applications ranging from viscous fluids, such as asphalt or Bunker C oil, to free-flowing oils, such as hydraulic fluids or lube oil. The small tank heater can also be used for water, and water/glycol or acidic mixtures as well as fire water storage and freeze protection. It is compliant with API-614 standards and is CSA certified.