What is the recommended temperature range of copper tube? 

The correct option is -40°C to 205°C

Explanation:

This range represents the practical and safe operating window for most general-purpose copper tubes used in standard plumbing and HVAC applications. It considers typical material limitations, joint types, pressure ratings, and common environmental conditions.
Factors Affecting Temperature Range:

• Wall Thickness: Thicker walls can handle higher temperatures due to increased material and structural rigidity. For example, thicker type M tubes might have slightly higher upper limits than thinner type K or L tubes.
• Type of Joint: Soldered joints typically have lower temperature limitations than brazed or mechanically joined ones. For instance, soldered joints might be limited to around 121°C, while brazed joints could extend to 180°C-205°C.
• Pressure Rating: Pipes designed for higher pressures may have stricter temperature constraints to ensure safe operation. High-pressure systems might have narrower temperature ranges compared to low-pressure applications.
• Application Factors: Specific environments with corrosive materials or intense heat exposure might necessitate reduced temperature allowances. Chemical compatibility and thermal stress influence the safe operating limits in specific contexts.