Which type of boiler is characterized by steam generating from electric resistance?

Electric boilers are designed to generate steam through the use of electric resistance elements. In this type of boiler, electrical energy is converted directly into heat, which then warms water to create steam. This process is efficient and allows for precise temperature control, making electric boilers particularly suitable for applications where space is limited or where clean, emission-free operation is desired.

Firetube and watertube boilers, on the other hand, utilize combustion processes to heat water or generate steam, relying on burning fuel rather than electricity for heat generation. Firetube boilers have hot gases flowing through tubes submerged in water, while watertube boilers have water flowing through tubes that are heated externally by combustion gases. Condensing boilers also focus on heat exchange and recovery from combustion gases, typically using fuel as their source of energy.

Therefore, the defining characteristic of an electric boiler is its use of electric resistance to generate steam, making it distinctly different from the other types of boilers mentioned.