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Which heating method is better, heat transfer oil or steam? Will heat transfer oil be slower than steam?

The speed of heat transfer oil is definitely faster than that of steam, because the minimum temperature of heat transfer oil is above 240 degrees, and the saturated steam is below 200 degrees. However, the heat distribution of steam is uniform, and heat transfer oil has requirements for sealing and fire prevention of pipelines and equipment. If the internal space of the equipment is small, I suggest using heat transfer oil. If the equipment is empty, it is best to use steam.