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Install an immersion heater from Grainger in a tank or other industrial container to heat water, oil, solvents or gas. Since immersion heaters come in direct contact with the target material, they are nearly 100% energy efficient. Flanged immersion heaters are commonly used in steam boilers. Screw-plug heaters are designed for industrial tanks and process piping. Use Grainger immersion heaters for safe, dependable heating of water tanks and containers of industrial fluids and gases.