What will happen if a boiler kept not clean internally?

If a boiler is not kept clean internally, it can accumulate scale, sludge, and corrosion, which can impair its efficiency and lead to overheating. This buildup can cause increased fuel consumption, higher operating costs, and a greater risk of equipment failure. In severe cases, it may lead to safety hazards such as leaks or explosions, necessitating costly repairs or replacements. Regular maintenance and cleaning are essential to ensure safe and efficient operation.