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Trace the safety discharge, identify the controls and decide what the evidence supports. The set moves from recognising components to assessing pipe routes, interpreting faults and checking the handover after installation.
Distinguish the pipe before the tundish from the gravity route after it. Check each part of a proposed route: visibility, material, sizing, fall and termination. A sound answer explains why the complete arrangement matters.
Revise D1 and D2 pipeworkIdentify normal temperature control, independent overheat protection and relief devices. A symptom such as a tripped cut-out calls for investigation; it does not identify the failed component by itself.
Review the protection layersCompare an external vessel with a manufacturer-designed internal air gap. Follow the model’s servicing procedure and distinguish a pre-charge check from a pressure reading taken while the water side is pressurised.
Understand expansion and pre-chargeFollow the water path in the diagram and separate what you can see from what still needs testing. For a discharge-sizing question, include the stated material and bend allowances. Read the explanation after each answer, then use the linked notes to revisit anything uncertain.
Use the free set in a timed practice test and review your answers at the end. These revision questions support learning; completing them does not award G3 certification or establish practical competence.
The free test offers 5, 10 or 25 questions from this same set, with an optional practice timer. In Test mode, answers and explanations appear after you finish. Repeated tests reuse this bank, so a higher score can reflect familiarity.
Set up a free G3 unvented hot water testYes. All 25 questions include answer feedback and explanations without an account or payment. You can also use the same set in normal practice, then create an account to save your progress.
Yes. It includes visibility at the tundish, D1 and D2, copper sizing, bend allowances and different termination arrangements. The numerical guidance questions identify their scope, including England where Approved Document G is used.
No. This is revision practice. Training, practical assessment, evidence of competence and the notification route for installation work are separate matters.
Premium opens the remaining G3 questions, alongside the other paid modules and review tools. Use your free-set answers to identify the controls, discharge or servicing topics you want to revisit first.
All 25 questions on this page are free, with no account or card required. They are selected from the maintained G3 unvented hot water question bank. Premium opens the full bank of 134 questions, more modules and Weak-Spot Review.
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