When may a water heater be connected using a flexible connector?

Flexible connectors for water heaters are typically used under certain conditions for practical reasons, such as accommodating movement, vibration, or when the heater is serviced or replaced. The appropriate answer indicates that in certain scenarios, the use of a flexible connector is permissible.

Using flexible connectors may be allowed specifically when replacing an existing heater to facilitate easier installation and disconnection. They can help reduce stress on the piping system, particularly if space or modifications pose challenges. In terms of compatibility with residential or commercial applications, flexible connectors can be used in both settings, providing versatility.

The concern with connecting a water heater using a flexible connector hinges on the specific plumbing codes and standards, which can vary by jurisdiction and are designed to ensure safety and compliance. Therefore, the use of flexible connectors is not universally prohibited but is conditioned by specific circumstances, such as replacement or limited installation space.

In this context, the notion that they are "not allowed" does not hold true, as there are established scenarios where flexible connectors can be appropriately utilized in connection with water heaters.