Abstract: Study aims to explore the influence of the variation of the inlet size of the DC fan in water heaters on the performance of the fan. Through a combination of experimental tests and numerical simulations, the performance parameters such as the flow rate, pressure, efficiency, and noise of the fan under different inlet sizes were analyzed. The research results show that the reasonable adjustment of the inlet size can significantly optimize the performance of the fan, providing important theoretical basis and practical guidance for the efficient operation and low-noise design of water heaters.

Key words: Water heater, DC fan, Inlet size, Performance optimization