Boilers are heat exchange devices used to generate steam by transferring heat from fuel to water. Based on the arrangement of tubes, boilers are broadly classified into straight tube boilers and bent tube boilers. These two types differ in construction, performance, and application. A straight tube boiler consists of straight tubes connecting the water drum and steam drum. The tubes are usually arranged either horizontally or slightly inclined, allowing water and steam to circulate naturally. Hot gases flow over or around these tubes, transferring heat to the water inside. Examples of straight tube boilers include simple water-tube designs used in earlier industrial systems. The construction is relatively simple, making them easier to manufacture and maintain. However, due to the straight configuration, they have limitations in handling high pressure and temperature conditions. The circulation of water may also be less efficient compared to more advanced designs, leading to lower heat transfer rates. In contrast, a bent tube boiler consists of tubes that are curved or bent in various shapes to connect the steam and water drums. These tubes are arranged in such a way that they form