For the production of steam and/or hot water, it is necessary to have an equipment to carry out this function, the boiler.
Electric boilers are heat generators that use electricity as a power source. Steam is generated by heat transfer at constant pressure.
Pyrotubular boilers are made up of a horizontally arranged cylindrical body, consisting of a set of multiple heat transmission tubes and an upper chamber for the formation and accumulation of steam, the hot combustion gases pass through the interior of a bundle of tubes. They were first used on ships with reciprocating steam engines.
In the case of water-tube boilers, it is the water that is inside these tubes, so the gases completely surround them. This type of boiler is suitable when the demand for steam is high, is safer and is generally used for high pressures.