What characteristic is important when selecting materials for boiler construction?

The selection of materials for boiler construction is crucial for ensuring the efficiency, safety, and longevity of the boiler system. Thermal conductivity is important because it determines how well the material can transfer heat, which directly impacts the boiler's efficiency and performance. High thermal conductivity materials enable better heat exchange, facilitating optimal operation of the boiler.

Corrosion resistance is also a vital characteristic. Boilers operate under high pressure and temperature conditions, often in environments that can be corrosive due to steam, water, or combustion gases. Choosing materials that resist corrosion helps to prevent deterioration and prolongs the lifespan of the boiler, ensuring it remains safe and functional over time.

The combination of thermal conductivity and corrosion resistance directly affects the reliability and durability of the boiler, making it critical for maintaining safety standards and operational efficiency. Other factors such as cost-effectiveness, weight, size, and aesthetic appeal, while relevant in certain contexts, are secondary to the fundamental requirements of performance and resilience in boiler construction.