ACS Gas Pro

About this app

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. Privacy Policy: https://www.webrichsoftware.com/privacy.html EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

This release follows a full independent audit of the question bank. NEW QUESTIONS — THE BANK IS NOW 1,260 • Meter outlet operating pressure, from IGEM/G/13: the 18.5–23 mbar acceptance range, the high-operating-load method, the one-minute stabilisation period, the 65 kW / U6 domestic capacity limit, and when a low-pressure supply has to be reported. • More IGEM/G/11 Edition 2 material: the prescribed turn-off order, the At Risk case where turning the appliance off does not remove the risk (and no DANGER DO NOT USE label is attached), RIDDOR 11(1) versus 11(2) duties and their timescales, and what to do as first person at a gas incident. STANDARDS BROUGHT UP TO DATE • References now name the editions in force — BS 6891:2015+A1:2019, BS 6172:2010+A1:2017, BS 669-1:2022, BS 5440-1:2023 and BS 5440-2:2023. • Every reference now points to a clause or section number instead of a page number, so you can find it in whichever copy of the standard you hold. CLEARER, FAIRER QUESTIONS • Reworked the answer options on 132 questions so the wording no longer hints at the right answer. The unsafe-situations questions in particular now test the classification rather than the phrasing. • Removed a duplicated opening line from 620 explanations. • Moved four diagrams that gave their answer away into the explanation, where they belong. • Corrected several source references that pointed at the wrong section. Spotted something that doesn't look right? Get in touch from the Support link on our App Store page — it genuinely helps.

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1. First observed Aug 10, 2026 · 4:33 PM Free