True or False: A device for controlling pressure should be installed in systems with a water-heating appliance and a backflow-prevention device or check valve.

A device for controlling pressure is essential in systems that incorporate a water-heating appliance and a backflow-prevention device or check valve because it helps maintain safe operation and protects the plumbing infrastructure.

When a check valve or backflow-prevention device is installed, it creates a scenario where the flow of water can be impeded in one direction. As water is heated, it expands, which increases pressure within the system. Without a pressure control device, this pressure can rise to dangerous levels, potentially leading to system failure or damage. The pressure control device mitigates this risk by allowing excess pressure to escape, thereby preventing possible ruptures or leaks and ensuring that the system operates safely.

In systems without such controls, excess pressure could also disrupt the efficacy of the backflow-prevention device, which might otherwise fail to serve its purpose if pressure builds up uncontrollably. Therefore, proper installation of a pressure control device is necessary whenever a water-heating appliance and a backflow prevention mechanism are utilized, ensuring safety and compliance with plumbing codes.