Are electric boilers known for being noisy in operation?

Electric boilers are generally considered to operate quietly compared to other types of boilers, such as gas or oil-fired units, which often produce more noise due to combustion processes, circulation of hot gases, or the mechanical components involved in their operation. The absence of these factors in electric boilers results in a quieter operation, primarily because the main working component is an electric heating element that does not produce significant sound.

While there may be some minor noise from water circulation or the pump operation, it is usually much less than the noise produced by fuel-burning boilers. In some cases, minor sounds may occur depending on system design, but overall, electric boilers are designed with quieter operation in mind. Therefore, indicating that they are known for being noisy in operation is inaccurate, making the correct answer that they are not known for noise.