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Gas Safe Registration (ACS) Syllabus
Accredited Certification Scheme assessment required for gas engineers to legally work on gas appliances and join the Gas Safe Register.. The complete Gas Safe Registration (ACS) outline — 7 subjects, 25 chapters and 92 topics — laid out so you can see exactly what has to be covered and tick each item off as you go.
Gas Safe Registration (ACS) subjects
Each subject below has its own page with the full chapter → topic → sub-topic tree and a set of real exam-style flashcards.
6 chapters · 25 topics · 62 sub-topics
Central Heating Boilers and Water Heaters (CENWAT)4 chapters · 15 topics · 22 sub-topics
Gas Fires and Wall Heaters (HTR1 / Fire Categories)3 chapters · 12 topics · 4 sub-topics
Cookers, Laundry and Catering Appliances3 chapters · 10 topics · 6 sub-topics
Liquefied Petroleum Gas (LPG) - Domestic and Park Homes3 chapters · 10 topics · 10 sub-topics
Commercial and Catering Gas (COCN1 / CORT)3 chapters · 10 topics · 11 sub-topics
Domestic Heating Systems, Controls and Energy Efficiency3 chapters · 10 topics · 6 sub-topics
Gas Safe Registration (ACS) flashcard decks
357 question-and-answer cards across 7 decks, written against this syllabus. Preview any deck free.
- Core Gas Safety (CCN1) - Domestic Natural Gas Foundation — 51 cards
- Central Heating Boilers and Water Heaters (CENWAT) — 56 cards
- Gas Fires and Wall Heaters (HTR1 / Fire Categories) — 49 cards
- Cookers, Laundry and Catering Appliances — 50 cards
- Liquefied Petroleum Gas (LPG) - Domestic and Park Homes — 50 cards
- Commercial and Catering Gas (COCN1 / CORT) — 50 cards
- Domestic Heating Systems, Controls and Energy Efficiency — 51 cards
How to work through the Gas Safe Registration (ACS) syllabus
The outline on this page is arranged the way the syllabus itself is: subject, then chapter, then topic, then sub-topic. That last level is what most study plans skip, and it is where coverage actually goes wrong — a chapter marked "done" often has three sub-topics inside it that were never touched.
Weight your plan accordingly: Core Gas Safety (CCN1) - Domestic Natural Gas Foundation carries 25 topics while Domestic Heating Systems, Controls and Energy Efficiency carries 10. Giving both the same number of weeks is the most common planning mistake for Gas Safe Registration (ACS).
The ~95 hour estimate above is a first pass only: roughly 45 minutes per topic plus 12 minutes per sub-topic. Revision cycles, past papers and mocks sit on top of that number.
Gas Safe Registration (ACS) syllabus FAQ
What subjects are in the Gas Safe Registration (ACS) syllabus?
Gas Safe Registration (ACS) covers 7 subjects: Core Gas Safety (CCN1) - Domestic Natural Gas Foundation, Central Heating Boilers and Water Heaters (CENWAT), Gas Fires and Wall Heaters (HTR1 / Fire Categories), Cookers, Laundry and Catering Appliances, Liquefied Petroleum Gas (LPG) - Domestic and Park Homes, Commercial and Catering Gas (COCN1 / CORT) and Domestic Heating Systems, Controls and Energy Efficiency. Together they contain 25 chapters and 92 named topics.
How much do you have to study for Gas Safe Registration (ACS)?
The full Gas Safe Registration (ACS) outline breaks down into 25 chapters, 92 topics and 121 sub-topics. Core Gas Safety (CCN1) - Domestic Natural Gas Foundation is the largest single subject with 25 topics across 6 chapters.
How long does it take to cover the whole Gas Safe Registration (ACS) syllabus?
Roughly 95 hours for one full pass. That estimate allows about 45 minutes per topic plus 12 minutes per sub-topic, so it is first-pass coverage — revision, past papers and mock tests sit on top of it. At 3 hours a day that is about 5 weeks.
Are there Gas Safe Registration (ACS) flashcards?
Yes — 357 question-and-answer flashcards across 7 decks, one per subject, written against this syllabus. A sample of every deck is readable on this site for free, and the complete decks are in the Examius app.
Is this Gas Safe Registration (ACS) syllabus free to use?
Yes. Every page here is free to read, and importing the Gas Safe Registration (ACS) syllabus into the Examius app to tick off topics as you finish them is free too, in United Kingdom and everywhere else. No account is needed to start.
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