Plumber Red Seal · Question
Thermal expansion of water in a closed hot water system (e.g., with a backflow preventer) can cause excessive pressure. What device should be installed to mitigate this?
An expansion tank contains a bladder and a compressed air charge, providing a space for heated, expanding water to occupy. This prevents system pressure from ri
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Question: Thermal expansion of water in a closed hot water system (e.g., with a backflow preventer) can cause excessive pressure. What device should be installed to mitigate this?
Answer options:
- A pressure reducing valve ✅ An expansion tank
- A water hammer arrestor
- A larger temperature and pressure relief valve
Correct answer: An expansion tank
Explanation: An expansion tank contains a bladder and a compressed air charge, providing a space for heated, expanding water to occupy. This prevents system pressure from rising to a dangerous level that could trip the T&P valve or damage components.
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