What should the pressure relief valve for low-pressure hot water systems be set at?

The pressure relief valve for low-pressure hot water systems should be set at 15 PSIG because this is the standard industry practice for residential and commercial applications. Setting the valve at 15 PSIG helps ensure safety, as it allows for the safe release of excess pressure that may build up in the system during operation or due to thermal expansion.

If the pressure were to exceed this setting, the relief valve would actuate to prevent potential damage to the system or hazardous conditions that could arise from excessive pressure. This standard is in place to maintain a balance between operational efficiency and safety, and aligns with guidelines set forth by plumbing and gas codes. A lower setting, such as 10 PSIG, may be inadequate for preventing pressure buildup, while higher settings could risk equipment damage or failures.