# ACS Gas Pro > ACS Exam Prep - All 6 Modules Canonical page: [https://chrome-stats.com/d/id1047795350](https://chrome-stats.com/d/id1047795350) ## Overview - **ID:** `id1047795350` - **Platform:** Apple - **Type:** Apple app - **Status:** Available - **Publisher:** Eknath Kadam - **Category:** Education - **Version:** 16 - **Last updated:** 2026-08-24 - **First published:** 2015-10-25 - **Size:** 51 MB - **Data as of:** 2026-09-06 - **Store listing:** [Apple App Store](https://apps.apple.com/us/app/acs-gas-pro/id1047795350) - **Website:** [https://www.acsgasprep.co.uk](https://www.acsgasprep.co.uk/) - **Privacy policy:** [https://www.webrichsoftware.com/privacy.html](https://www.webrichsoftware.com/privacy.html) ## Description 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/ ## Rankings - #1,846,166 — Overall ## Similar extensions and apps - [Gas ACS CCN1 Exam](https://chrome-stats.com/d/id6749202714) - [Gas Safe ACS Prep CCN1](https://chrome-stats.com/d/id6792450802) - [ACS Gas Appliances Exam CCN1](https://chrome-stats.com/d/id6742821397) - [ACS Gas Safety Exam CCN1](https://chrome-stats.com/d/id6447238915) - [Gas Safe CCN1 Exam Prep](https://chrome-stats.com/d/id6755082572) - [F-Gas Prep (C&G 2079)](https://chrome-stats.com/d/id6792475239) - [F-Gas Pro - Certification Exam](https://chrome-stats.com/d/id6759997441) - [TSSA G3 Exam Prep](https://chrome-stats.com/d/id6758907957) - [C&G Domestic Natural Gas Exam](https://chrome-stats.com/d/id1525707965) - [TSSA G1 Exam Prep](https://chrome-stats.com/d/id6758885530) - [TSSA G2 Exam Prep](https://chrome-stats.com/d/id6758906174) - [ACSA EPA 608 Prep](https://chrome-stats.com/d/id6759812256) — 4.00 / 5 --- Source: [Chrome-Stats](https://chrome-stats.com/d/id1047795350)