Abstract: Based on the burning performance of water-blended fuel emulsified unit used in boiler, two thermal e-quilibrium analysis methods for emulsified oil boiler/heater have been given in the paper. In accordance with several test methods commonly used on the fuel-saving rate of water-blended fuel emulsified unit, the authors provide a more accurate test method on fuel-saving rates, also put forward a reasonable evaluation method on energy-saving efficiency for the water-blended fuel emulsified unit.