Free
Level 2Cold Water Systems
Direct and stored supplies, cistern storage, float-operated valves and protecting the supply from backflow.
121 questions 11 study notes
Plumbing revision
Plumbing revision
Plumbing theory, tests and quiz practice grouped the way the job actually works rather than a flat subject list. Begin with cold water & field diagnostics; Premium unlocks the full plumbing bank.
- 1,845 exam-style questions
- 126 study notes
- 15 modules
Water In
Getting clean water in — the cold supply and storage, and the science behind pressure and flow.
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Level 2Scientific Principles
The science behind the trade — pressure and head, heat and expansion, flow and units.
123 questions 11 study notes
Heat & Hot Water
Heating it and storing it safely — hot water and central heating systems.
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Level 2Hot Water Systems
Vented and unvented hot water, safe delivery temperatures, expansion and secondary circulation.
120 questions 10 study notes
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Level 2Central Heating
System layouts, controls and interlock, emitters and balancing for domestic heating.
103 questions 9 study notes
Water Out
Taking water away — drainage, sanitation and rainwater.
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Level 2Drainage & Sanitation
Trap seals, branch pipework and stack ventilation, and keeping the system free of contamination.
122 questions 10 study notes
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Level 2Rainwater Systems
Gutters and downpipes, sizing for rainfall and safe surface-water discharge.
120 questions 6 study notes
Work Safe & Smart
Working safely and to standard — health & safety, the core processes and safe electrical isolation.
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Level 2Health & Safety
Safe isolation, working at height, COSHH and asbestos awareness, PPE and CSCS card basics.
121 questions 5 study notes
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Level 2Common Plumbing Processes
Jointing methods and materials, tools and measuring, and the UK qualification routes.
146 questions 6 study notes
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Level 2Electrical Safety & Isolation
Safe isolation, bonding and earthing awareness, bathroom zones and the scope of Part P.
122 questions 4 study notes
Diagnostics & Green Skills
On-the-job judgement and the shift to low-carbon — fault-finding call-outs and renewables awareness.
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Level 2Field Diagnostics
What-would-you-do call-outs: no hot water, no heating, leaks and low pressure, routed to safe checks.
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Level 2Low-Carbon & Renewables
Awareness of the shift off gas — heat pumps, solar thermal and what the Future Homes Standard means for the trade.
108 questions 2 study notes
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. Premium.
Heating & Hot Water (L3)
Design and size it properly — heat loss, emitter and pump sizing, hot water storage and reheat, commissioning and fault diagnosis.
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Level 3Central Heating (L3)
System design, heat loss and gain, sizing of boiler, emitters, pipework, pump and vessel, commissioning and fault diagnosis.
125 questions 16 study notes
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Level 3Hot Water (L3)
System selection, demand and storage sizing, reheat times, scald protection and fault diagnosis.
124 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.
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Level 3Cold Water (L3)
Loading-unit sizing, storage and accumulators, the Water Fittings Regulations, Legionella control and commissioning.
126 questions 12 study notes
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Level 3Domestic Fuels (L3)
Fuel types and characteristics, low-carbon heat sources, choosing a fuel, safe storage and the competent-person bodies.
144 questions 12 study notes
How UK plumbing qualifications fit together
Plumbing has two things employers look at: knowledge and competence. The Level 2 (and later Level 3) Diploma proves the theory — cold water, hot water, central heating, drainage and safety — while an NVQ proves you can do the work to standard on real sites. Most people need both, and the on-site part is what turns a certificate into a job. Our Level 2 Diploma vs NVQ guide explains the difference that matters, and the real routes into plumbing covers apprenticeship, college and the plumber’s-mate way in.
What to revise, and in what order
Start with the everyday systems and build up: cold water and field diagnostics first, then hot water and central heating, then drainage. Two topics carry extra weight because they are safety-critical and come up again and again — the Water Regulations (fluid categories and backflow) and G3 unvented hot water (expansion, relief valves and safe discharge). The unvented cylinder explained guide is a good visual starting point.
Level 2 or Level 3?
Level 2 is the foundation most learners start with; Level 3 adds design and diagnosis depth — heat-loss and sizing calculations, hot-water storage and low-carbon fuels. You do not have to choose now: work through the Level 2 modules until they are second nature, then step up. The field tools like the radiator BTU calculator and drainage-fall calculator are free and useful at both levels.
Free vs Premium
A broad set of plumbing notes and practice questions is free so you can start revising today. Premium unlocks the full Level 2 and Level 3 question bank and the timed mock tests, so you can practise under exam conditions and see exactly where your weak spots are.