25 free questions
Level 2Cold Water Systems
Direct and stored supplies, cistern storage, float-operated valves and protecting the supply from backflow.
Plumbing revision
Plumbing theory revision
Level 2 and Level 3 plumbing theory revision, with study notes, diagrams and exam-style questions. Choose a system below, learn how it works, then check your understanding in practice.
- 2,228 exam-style questions
- 173 study notes
- 16 modules
Every Level 2 and Level 3 module has 25 free questions, with no account needed. Premium unlocks the full plumbing question bank and longer timed mocks.
Water In
Getting clean water in — the cold supply and storage, and the science behind pressure and flow.
25 free questions
Level 2Scientific Principles
The science behind the trade — pressure and head, heat and expansion, flow and units.
Heat & Hot Water
Heating it and storing it safely — hot water and central heating systems.
25 free questions
Level 2Hot Water Systems
Vented and unvented hot water, safe delivery temperatures, expansion and secondary circulation.
25 free questions
Level 2Central Heating
System layouts, controls and interlock, emitters and balancing for domestic heating.
Water Out
Taking water away — drainage, sanitation and rainwater.
25 free questions
Level 2Drainage & Sanitation
Trap seals, branch pipework and stack ventilation, and keeping the system free of contamination.
25 free questions
Level 2Rainwater Systems
Gutters and downpipes, sizing for rainfall and safe surface-water discharge.
Work Safe & Smart
Working safely and to standard — health & safety, the core processes and safe electrical isolation.
25 free questions
Level 2Health & Safety
Safe isolation, working at height, COSHH and asbestos awareness, PPE and CSCS card basics.
25 free questions
Level 2Common Plumbing Processes
Jointing methods and materials, tools and measuring, and the UK qualification routes.
25 free questions
Level 2Electrical Safety & Isolation
Safe isolation, bonding and earthing awareness, bathroom zones and the scope of Part P.
Diagnostics & Green Skills
On-the-job judgement and the shift to low-carbon — fault-finding call-outs and renewables awareness.
25 free questions
Level 2Field Diagnostics
What-would-you-do call-outs: no hot water, no heating, leaks and low pressure, routed to safe checks.
25 free questions
Level 2Low-Carbon & Renewables
Awareness of the shift off gas — heat pumps, solar thermal and what the Future Homes Standard means for the trade.
Step up to Level 3
Design and diagnosis depth above the Level 2 foundations — heat-loss and sizing calculations, hot water storage, cold water and low-carbon fuels. Every Level 3 module has 25 free questions.
Heating & Hot Water (L3)
Design and size it properly — heat loss, emitter and pump sizing, hot water storage and reheat, commissioning and fault diagnosis.
25 free questions
Level 3Central Heating (L3)
System design, heat loss and gain, sizing of boiler, emitters, pipework, pump and vessel, commissioning and fault diagnosis.
134 questions 17 study notes
25 free questions
Level 3Hot Water (L3)
System selection, demand and storage sizing, reheat times, scald protection and fault diagnosis.
95 questions 12 study notes
Cold Water & Fuels (L3)
Loading-unit sizing and Legionella control for cold water, and the fuels and heat sources that drive a system.
25 free questions
Level 3Cold Water (L3)
Loading-unit sizing, storage and accumulators, the Water Fittings Regulations, Legionella control and commissioning.
108 questions 12 study notes
25 free questions
Level 3Domestic Fuels (L3)
Fuel types and characteristics, low-carbon heat sources, choosing a fuel, safe storage and the competent-person bodies.
99 questions 12 study notes
Sanitation & Drainage (L3)
Design and prove the waste side: stack ventilation, discharge sizing, pumped systems, soundness tests and fault diagnosis.
25 free questions
Level 3Sanitation & Drainage (L3)
Sanitary pipework design and ventilation, discharge-pipe and stack sizing, pumped and macerator systems, soundness testing and fault diagnosis.
40 questions 4 study notes
Free Level 2 plumbing test questions
Every Level 2 module has a free test of 25 exam-style multiple-choice questions, and every answer is explained. You do not need an account.
- Health and safety: COSHH, asbestos, PPE, hot works and duties under health and safety law.
- Plumbing processes: jointing methods, hand tools, pipe bending and the building fabric.
- Plumbing science: hydraulics and head pressure, heat transfer, expansion and the calculations behind them.
- Cold water: pipe materials, isolation, frost protection, cisterns, float valves and backflow prevention.
- Hot water: vented cylinders, temperatures and scald safety, combi boilers, thermal stores and installation checks.
- Central heating: system layouts and radiators, controls and boiler interlock, balancing and water treatment.
- Drainage: trap seals, waste and soil stacks, sanitary appliances and pipe falls.
- Rainwater: gutters, downpipes and outlets, sizing from roof area, harvesting and greywater.
- Electrical safety: safe isolation, Part P and Ohm’s law calculations.
Two more sets apply the same knowledge on the job: fault-finding scenarios and low-carbon heating. The questions are original practice, not past papers. How your knowledge is tested depends on the qualification and your centre, so ask for the assessment plan and use these tests to find the topics you still need to revise.
What should I revise for Level 2 plumbing?
Start with safe working, pipework processes and the science behind water and heat. Then apply that knowledge to cold water, hot water, heating and drainage. Match your revision to the unit list your college or assessor has given you: a Level 2 course name alone does not identify every assessment you will take.
- Safety and processes: recognise hazards, explain safe isolation, choose suitable materials and describe how joints and supports work.
- Science and calculations: practise units, volume, flow, pressure, heat and expansion. Use the water head and pressure calculator to check a calculation after working it out.
- Water supplies: trace a direct or stored cold supply and explain hot-water controls. The cylinder diagram helps you connect each component to its job.
- Heating and drainage: follow the water through a heating circuit, explain trap seals and check gradients with the drainage fall calculator.
- Judgement: explain why an answer is safe, what evidence you would check next and when a fault needs escalation.
Turn a plumbing quiz into a revision session
Choose one topic for a short session. Read its note, close it and sketch the system or explain the rule from memory. Answer a few questions, then read each explanation, including the ones you got right by guessing. Write down the reason for each mistake: a missing fact, a wrong unit, a misread diagram or an unsafe next step.
On your next visit, revisit those mistakes before changing topics. Include every unit in your plan; repeatedly scoring well on cold water does not check your drainage knowledge. Start with the free tests listed above, then use the module cards to fill gaps.
Level 2 or Level 3?
Use the Level 2 modules to build your understanding of everyday systems. Our Level 3 modules add design and diagnosis: sizing, heat loss, storage and fuel choices. For example, identifying a radiator valve is different from explaining whether the radiator can meet a room’s heat demand at a lower water temperature. The radiator sizing calculator lets you work through that second question. Your qualification handbook decides which topics and practical assessments your route requires.
Does this cover City & Guilds or NVQ plumbing revision?
These resources support the plumbing theory used across qualification routes. Our modules group subjects by system; they are not awarding-body unit numbers. Use the 6189 qualification guide to plan knowledge and workplace evidence separately. An NVQ can itself be called a Diploma: the Diploma versus NVQ guide explains why the full qualification title matters. Online quiz results do not replace observed practical work or a workplace portfolio.
Free vs Premium
Every Level 2 and Level 3 module has a free practice set of 25 questions. Guides, calculators and every revision note are also available without payment. Premium unlocks the full question bank and longer timed mock assessments.
Still choosing a course? Read how to get into plumbing before building your revision plan.