What is the working pressure normally used on hot water heaters installed at individual houses?

In residential applications, the working pressure typically prescribed for hot water heaters is often around 4 ounces per square inch. This measurement refers to the pressure needed to effectively operate the safety devices within the heater and maintain efficient performance without risking damage to the unit or the plumbing system. The use of lower pressure is critical in ensuring that the water heater functions safely, particularly with the release of steam or excess pressure, which could lead to dangerous situations if not properly managed.

It is essential to note that pressures higher than this, such as the other options suggest, may be applicable to different systems or industries but are not standard for residential hot water heaters. Maintaining such pressure is integral to the effective operation of the heater and the overall safety of the plumbing system in a home setting.