| http://www.w3.org/ns/prov#value | - The surface heater can be any type of surface heater, including radiant heat from, for example, one or more electrical radiant heating tubes, a vapor heater, for example, for heating air or for vaporizing liquid, such as water, or even the cleaning solution, or conceivably could be a heated liquid, which may or may not be the cleaning solution.
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