CSLB C-46 Solar ContractorElectrical and Plumbing CodesEasy
A solar contractor is installing a new solar thermal system for domestic hot water. Which of the following is the maximum pressure relief valve (PRV) setting allowed for a potable water heater, as per the Uniform Plumbing Code (UPC)?
- A200 PSI
- B100 PSI
- C125 PSI
- D150 PSI
Show answer & explanationAnswer & explanation
Correct answer: D. 150 PSI
The Uniform Plumbing Code (UPC) specifies that the maximum pressure relief valve (PRV) setting for a potable water heater should not exceed 150 PSI to ensure safety and prevent over-pressurization.
Why the other options are wrong
- A. This is above the maximum allowed pressure for a potable water heater PRV and would be unsafe.
- B. This is below the maximum allowed pressure for a potable water heater PRV.
- C. This is below the maximum allowed pressure for a potable water heater PRV.
Potable Water Heater PRV Setting (UPC)
The maximum pressure at which a pressure relief valve (PRV) on a potable water heater is permitted to open, as regulated by the Uniform Plumbing Code (UPC), to prevent dangerous over-pressurization.
- Ensures safety of the water heater and plumbing system.
- Protects against excessive internal pressure.
- Mandatory safety device for all potable water heaters.
Memory trick: Safe water pressure keeps the hot water flowing, not blowing.