What is true about a relief-valve pipe terminating into a water leak catch pan?

When a relief-valve pipe terminates into a water leak catch pan, it is not permissible according to plumbing codes and safety standards. The primary purpose of a relief valve is to allow excess pressure or temperature to escape from a system—usually a water heater—safely. If the valve discharges into a catch pan rather than a proper drain, there is a risk of overflow or blockage, which could lead to pressure build-up or water damage in the surrounding area.

Proper drainage systems are required for relief valves to ensure that any discharged water is directed away safely, preventing leaks and associated hazards. The use of a catch pan may create a false sense of security, as the pan can fill up, leading to potential overflow. Therefore, terminating a relief-valve pipe into a catch pan does not meet safety standards and can pose various risks to the property.