The two general designs of electric boilers are the:

The correct answer focuses on the two primary designs of electric boilers, which are the electrode and immersion types.

Electric boilers operate by converting electrical energy into heat, and the designs have implications for efficiency and applications.

Electrode boilers use electrical resistance generated by the flow of current through water or steam, directly heating the medium. This method is often characterized by a straightforward design and a rapid response time to load changes, making it suitable for applications needing quick heat generation. The boiler requires water to conduct the electricity, making it essential that the water quality and conductivity are maintained within safe ranges.

Immersion boilers, on the other hand, consist of electric heating elements that are placed within the water or other heating medium. This design allows for efficient heat transfer as the heating elements directly warm the liquid they are submerged in. This type of design is versatile and can be easily scaled for different capacities, which makes immersion boilers popular in various industrial and commercial heating applications.

Choosing between these two designs involves considering factors like efficiency, the required heating capacity, and the specific application needs, illustrating the importance of understanding these types in the context of electric boilers.