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| Term | Definition |
|---|---|
| UL Listed | Product certification that indicates the product meets safety standards determined by Underwriters Laboratories. (ULC and cUL indicate Canadian requirements.) |
| Ultimate Analysis | See "Analysis Ultimate." |
| Unaccounted-For Loss | That portion of a boiler heat balance which represents the difference between 100 per cent and the sum of the heat absorbed by the unit and all the classified losses expressed as per cent. |
| Unburned Combustible | The combustible portion of the fuel which is not completely oxidized. |
| Unfired Pressure Vessel | A vessel designed to withstand internal pressure, neither subjected to heat from products of combustion nor an integral part of a fired pressure vessel system. |
| Use Factor | The ratio of hours in operation to the total hours in that period. |
