ACS Gas Pro

ACS Gas Pro — the complete UK gas engineer toolkit. Over 1,250 exam questions across all six core ACS modules — CCN1, CENWAT, CKR1, CPA1, HTR1 and MET1 — plus on-site calculators, a Quick Reference cheat-sheet library, and MyACS, your CP12 / renewal / CPD logbook.

Every question is grouped by sub-topic, with detailed explanations and clause-level references designed to match what you'll see on assessment day.

Whether you're preparing for initial ACS certification, revising before re-assessment, or working on the tools, ACS Gas Pro is built for the job.

CCN1 — CORE GAS SAFETY (743 questions)
The foundation module every gas operative must pass. Topics include:
• Flues & Spillage
• Documentation & Legal Duties
• Unsafe Situations & RIDDOR
• CO Safety
• Ventilation
• Tightness Testing
• Combustion Principles
• Pipework & Fittings
• Gas Rates & Pressures
• Meter Outlet Operating Pressure
• Appliance Safety Devices
• Gas Emergency Actions
• Emergency Isolation Controls
• Meters & Controls
• Purging
• Customer Communication
• Relighting Appliances

APPLIANCE MODULES
• CENWAT (119 questions) — Central Heating Boilers & Hot Water
• CKR1 (93 questions) — Cookers
• CPA1 (88 questions) — Combustion Performance Analysis
• HTR1 (117 questions) — Fires & Wall Heaters
• MET1 (100 questions) — Domestic Meters & Controls

10 ON-SITE CALCULATORS
• Gas Rate (U6 / E6 meter, dial-revolution timing)
• Ventilation Required (room sizing, high/low vents)
• Tightness Test (U6, IGEM/UP/1B)
• Boiler Sizing (heat-loss / DHW demand)
• Calorific Value Lookup (NG / LPG)
• CO/CO₂ Ratio (combustion analyser check)
• Flue Termination Lookup (distances by appliance type)
• Pipe Sizing (copper, steel, length & load)
• Unit Converter (mbar, kW, m³/h, BTU)
• Unsafe Situation Classifier (ID / AR — IGEM/G/11 Edition 2)

QUICK REFERENCE CHEAT SHEETS
Searchable cards covering flue distances, CO/CO₂ limits, standard appliance pressures, ventilation requirements, tightness-test pass/fail criteria, the Unsafe Situations Procedure, pipe-sizing tables and a gas-engineering glossary.

MyACS — YOUR LOGBOOK
• CP12 / Landlord Gas Safety Record log with PDF export
• ACS renewal reminders — never miss a re-assessment date
• CPD log with annual target tracking
• Warning Notices (Immediately Dangerous / At Risk) with PDF export
• Engineer profile (Gas Safe number, business details) auto-filled into every document
• Daily safety refresher card and study streak

KEY FEATURES
• 1,260 questions with full explanations and diagrams
• References to current standards — BS 6891:2015+A1:2019, BS 5440-1:2023, BS 5440-2:2023, BS 6172:2010+A1:2017, BS 669-1:2022, IGEM/G/11 Edition 2 and IGEM/G/13
• Module-specific Mock Tests, 50 questions each
• Flash Cards for quick revision
• Voice-over support (en-GB) for hands-free study on-site
• Progress tracking with visual charts
• PDF export of study reports, CP12 records and Warning Notices
• iCloud sync across your devices
• Works offline once downloaded

WHO IT'S FOR
• Engineers preparing for ACS initial assessment
• Gas operatives revising before re-assessment
• Apprentices working alongside their NVQ
• Trainers reviewing module content
• Working engineers needing on-site calculators and a CP12 logbook

For revision purposes only — always verify against the current ACS scheme rules and manufacturer instructions before any gas work.

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