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HS&E PLUM practice question: Water systems and legionella (1 of 6)

E. Specialist: Plumbing (JIB) A free question from our original HS&E PLUM practice exam. Try it, then open the answer to see why each option is right or wrong.

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You are commissioning a hot water cylinder in an office block.

What temperature should hot water be stored at, to control legionella?

Choose one answer.

  1. A. Below 20°C
  2. B. At least 60°C
  3. C. About 40°C, to save energy
  4. D. About 30°C
Show the answer and explanation

Answer: B

  • A. Wrong: Wrong. Below 20°C is for cold water.
  • B. Right: Right. HSE says hot water should be stored at 60°C or more.
  • C. Wrong: Wrong. That is a temperature legionella can grow at.
  • D. Wrong: Wrong. That is far too low to control legionella.

Explanation

Store hot water at 60°C or more, and keep cold water below 20°C.

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