What is the gas pressure that a combination gas valve reduces to?

A combination gas valve is designed to reduce the incoming gas pressure to a specific level that is suitable for appliances such as appliances that use natural gas. The reduced pressure is typically standardized for safety and operational efficiency.

In residential gas systems, the standard outlet pressure for appliances is generally 3.5 inches of water column (wc). This level of pressure ensures that gas appliances, such as furnaces, water heaters, and stoves, can operate effectively and safely. It provides enough pressure for efficient combustion while minimizing the risk of leaks or unsafe operation.

The other options reflect pressures that are either too high or not commonly used in residential applications. Therefore, the correct answer aligns with industry standards for gas appliances, reinforcing the importance of proper gas pressure for appliance function and safety.