Which of the following is NOT an advantage of an electric boiler over other boilers?

Electric boilers are known for several advantages, particularly when compared to traditional fossil fuel boilers. One of the key benefits is their quiet operation, as they do not rely on combustion and hence produce minimal noise during operation. Their compact design is also noteworthy, allowing them to fit into smaller spaces compared to larger steam or hot water boilers that often require more extensive space for operation and maintenance.

Another advantage of electric boilers is their high efficiency. Electric heating is typically more efficient than combustion-based heating, as almost all the electrical energy is converted into heat, minimizing waste. This leads to lower operating costs as the energy consumed is used effectively.

Choosing "does not need water treatment" as the correct answer highlights a common misconception. While electric boilers do have advantages in terms of cleanliness and efficiency, they still require maintenance to ensure the water quality is managed properly. The absence of combustion products means fewer pollutants and simpler maintenance, but most water systems—even those supplying electric boilers—can still have to be treated to prevent scaling and corrosion, depending on the local water quality.

Thus, the assertion that electric boilers do not need any water treatment is exaggerated and incorrect; this is why it stands out as not being an advantage over other boiler types.