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HS&E SAF practice question: Water hygiene (1 of 5)

E. Specialist: HVACE – services and facilities maintenance A free question from our original HS&E SAF practice exam. Try it, then open the answer to see why each option is right or wrong.

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You check water temperatures in an office block.

What should cold water be kept below, where possible?

Choose one answer.

  1. A. 37°C, close to body temperature
  2. B. 45°C
  3. C. 20°C
  4. D. 30°C
Show the answer and explanation

Answer: C

  • A. Wrong: Wrong. That helps legionella grow.
  • B. Wrong: Wrong. That is warm enough for legionella.
  • C. Right: Right. HSE says cold water systems should be kept below 20°C where possible.
  • D. Wrong: Wrong. The figure is 20°C.

Explanation

Keep cold water below 20°C, store hot at 60°C and reach 50°C at outlets within a minute.

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