Exams / HS&E PLUM / Water systems and legionella / Question 2
HS&E PLUM practice question: Water systems and legionella (2 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.
Last verified October 2026 against HSE guidance and the law ·How we write our questions
You are checking the hot taps in a building you have just plumbed.
What does HSE say the water should reach at the outlets?
Choose one answer.
A A. 40°C within 10 minutesB B. 20°C within 1 minuteC C. 50°C within 1 minuteD D. 30°C within 5 minutesShow the answer and explanation Answer: C
A. Wrong: Wrong. That is too cool and too slow.B. Wrong: Wrong. 20°C is the upper limit for cold water.C. Right: Right. HSE says hot water should reach 50°C within 1 minute at the outlets (55°C in healthcare premises).D. Wrong: Wrong. That is too cool and too slow.Explanation Hot water should reach 50°C at the outlets within 1 minute (55°C in healthcare).
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