Exams / HS&E PLUM / Water systems and legionella / Question 5
HS&E PLUM practice question: Water systems and legionella (5 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 fitting a shower in a care home, used by vulnerable residents.
What must be fitted to prevent scalding?
Choose one answer.
A A. A hotter boiler so water heats fasterB B. A Type 3 thermostatic mixing valveC C. A bigger cylinder for more flowD D. A sign asking residents to take careShow the answer and explanation Answer: B
A. Wrong: Wrong. That would make scalding more likely.B. Right: Right. HSE says where vulnerable people use baths or showers, a TMV Type 3 must be fitted so water isn't delivered above 44°C.C. Wrong: Wrong. That doesn't limit the temperature.D. Wrong: Wrong. A sign isn't enough for vulnerable residents.Explanation Above 44°C water can scald. Where vulnerable people bathe, fit a Type 3 TMV.
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