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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 full Gas Safe Registration (ACS) syllabus: 7 subjects, 25 chapters, 92 topics and 121 sub-topics, with 357 flashcards written against it.

7Subjects
25Chapters
92Topics
121Sub-topics
357Flashcards

Gas Safe Registration (ACS) subjects

Gas Safe Registration (ACS) has 7 subjects. Each one is listed below with its chapters in syllabus order; open a subject for every topic and sub-topic inside them.

Core Gas Safety (CCN1) - Domestic Natural Gas Foundation

6 chapters · 25 topics · 62 sub-topics · 51 flashcards

  1. Gas Properties, Combustion and Industry Context · 4 topics
  2. Legislation, Standards and Documentation · 5 topics
  3. Gas Installation Pipework and Tightness Testing · 4 topics
  4. Meters, Controls and Pressure/Gas Rate · 4 topics
  5. Ventilation, Flues and Combustion Performance · 4 topics
  6. Emergency Procedures, CO Awareness and Unsafe Situations · 4 topics

Central Heating Boilers and Water Heaters (CENWAT)

4 chapters · 15 topics · 22 sub-topics · 56 flashcards

  1. Boiler Types and Operating Principles · 4 topics
  2. Installation and Commissioning of Boilers · 4 topics
  3. Instantaneous and Storage Water Heaters · 4 topics
  4. Fault Finding and Servicing of Wet Heating Appliances · 3 topics

Gas Fires and Wall Heaters (HTR1 / Fire Categories)

3 chapters · 12 topics · 4 sub-topics · 49 flashcards

  1. Types of Gas Fires and Heaters · 5 topics
  2. Hearths, Fireplaces and Catchment Space · 3 topics
  3. Installation and Commissioning of Fires · 4 topics

Cookers, Laundry and Catering Appliances

3 chapters · 10 topics · 6 sub-topics · 50 flashcards

  1. Domestic Gas Cookers (CKR1) · 4 topics
  2. Gas Tumble Dryers and Laundry (LAU1) · 3 topics
  3. Range Cookers and Combined Appliances · 3 topics

Liquefied Petroleum Gas (LPG) - Domestic and Park Homes

3 chapters · 10 topics · 10 sub-topics · 50 flashcards

  1. LPG Properties and Supply · 3 topics
  2. LPG Pipework and Tightness Testing · 3 topics
  3. LPG in Park Homes, Boats and Leisure (PD/LEI) · 4 topics

Commercial and Catering Gas (COCN1 / CORT)

3 chapters · 10 topics · 11 sub-topics · 50 flashcards

  1. Commercial Core Safety (COCN1) · 4 topics
  2. Commercial Catering Appliances (COMCAT) · 3 topics
  3. Commercial Heating and Plant · 3 topics

Domestic Heating Systems, Controls and Energy Efficiency

3 chapters · 10 topics · 6 sub-topics · 51 flashcards

  1. Wet Central Heating System Design · 4 topics
  2. Heating Controls and Energy Efficiency · 3 topics
  3. System Maintenance and Water Quality · 3 topics

Gas Safe Registration (ACS) flashcards

357 question-and-answer cards across 7 subject decks, each shown in full on its subject page.

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.

How many chapters and topics are in the Gas Safe Registration (ACS) syllabus?

25 chapters and 92 topics, broken down further into 121 sub-topics, across 7 subjects. Core Gas Safety (CCN1) - Domestic Natural Gas Foundation is the largest subject, with 25 topics in 6 chapters.

Are there Gas Safe Registration (ACS) flashcards?

Yes — 357 question-and-answer flashcards in 7 subject decks. Each deck is printed in full on its subject page here, and the same cards are in the Examius app with spaced repetition. The free plan covers one exam of your choice, including its flashcards; Examius Pro, a one-time purchase, unlocks every other exam and deck.

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