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HS&E HAPS practice question: Hot water and legionella (2 of 5)

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

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A client asks why you are fitting mixing valves to some taps.

Above what tap temperature does HSE say there is a risk of scalding?

Choose one answer.

  1. A. 70°C, as anything cooler is always safe
  2. B. 90°C, as only near-boiling water scalds
  3. C. There is no risk from tap water
  4. D. 44°C
Show the answer and explanation

Answer: D

  • A. Wrong: Wrong. The risk starts above 44°C.
  • B. Wrong: Wrong. The risk starts above 44°C.
  • C. Wrong: Wrong. Water above 44°C can scald.
  • D. Right: Right. HSE says there is a risk of scalding where water comes out of taps above 44°C.

Explanation

Water above 44°C can scald. Where vulnerable people use baths or showers, fit a Type 3 TMV.

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