Plumber Red Seal · Question
What is the most frequent cause of water hammer in a plumbing system?
Water hammer is a hydraulic shockwave caused by the sudden stop or change in direction of water flow. Devices that close quickly, like solenoid valves (in dishw
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Question: What is the most frequent cause of water hammer in a plumbing system?
Answer options:
- Water pressure below 40 psi
- Air trapped at high points in the piping ✅ Quick-closing solenoid valves or single-lever faucets
- A partially closed main water shutoff valve
Correct answer: Quick-closing solenoid valves or single-lever faucets
Explanation: Water hammer is a hydraulic shockwave caused by the sudden stop or change in direction of water flow. Devices that close quickly, like solenoid valves (in dishwashers, washing machines) and single-lever faucets, are the most common culprits.
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