What is one impact of scale on boiler efficiency?

Scale accumulation in a boiler has a significant impact on its efficiency primarily because it acts as an insulator. When scale builds up on the heat exchange surfaces of the boiler, it creates a barrier between the heat source and the water being heated. This insulating layer interferes with the transfer of heat, meaning that more energy (fuel) is required to achieve the desired temperature of the water or steam. As a result, fuel consumption increases, reducing overall efficiency.

Additionally, the insulating properties of scale can lead to uneven heating and potentially higher temperatures in the boiler’s metal surfaces, which might cause thermal stress or even damage in severe cases. Therefore, maintaining proper water treatment and scaling prevention is essential to ensure optimal boiler performance and efficiency.