The various factors affecting the boiler performance are listed below:

        1. Periodical cleaning of boilers

        2. Periodical soot blowing

        3. Proper water treatment programme and blow down control

        4. Draft control

        5. Excess air control

        6. Percentage loading of boiler

        7. Steam generation pressure and temperature

        8. Boiler insulation

        9. Quality of fuel

All these factors individually/combined, contribute to the performance of the boiler and reflected either in boiler efficiency or evaporation ratio. Based on the results obtained from the testing further improvements have to be carried out for maximizing the performance. The test can be repeated after modification or rectification of the problems and compared with standard norms. Energy auditor should carry out this test as a routine manner once in six months and report to the management for necessary action.