--- title: "ACS Gas Pro - Reviews, Revenue and Downloads in United Kingdom | Apple App Store" 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 ch" --- # ACS Gas Pro — United Kingdom > ACS Exam Prep - All 6 Modules ![ACS Gas Pro App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/50/17/72/501772bd-5c63-2bfa-78dc-9912a65844a1/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/400x400bb.png) **Developer:** [Eknath Kadam](https://apptail.io/developer/eknath-kadam-nyQ) (United Kingdom) **Category:** Education **Rating:** 4.8/5 (327 ratings) **Price:** Free **Bundle ID:** com.webrich.IETWiringRegulations **Store:** Apple App Store **Country:** United Kingdom **Version:** 16.3 (released 2026-08-24) **Original Release:** 2015-10-25 **App Store Link:** [Download on Apple App Store](https://apps.apple.com/gb/app/app/id1047795350) **AppTail Page:** [https://apptail.io/app/acs-gas-pro-Pgae/united-kingdom](https://apptail.io/app/acs-gas-pro-Pgae/united-kingdom) ## ACS Gas Pro 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: EULA: ## ACS Gas Pro Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/d7/d6/85/d7d68520-270c-2cae-170e-eb02d0f11d69/01_marketing.png/320x480bb.jpg) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/39/df/61/39df6191-5761-1145-10b3-437958d01b2d/02_marketing.png/320x480bb.jpg) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/36/d3/ae/36d3ae89-cd80-b790-dfe7-8981ab38cf17/03_marketing.png/320x480bb.jpg) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/61/40/c7/6140c76c-85d9-e8c0-6b2c-3f9ee4d91195/04_marketing.png/320x480bb.jpg) - [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/6b/cb/a6/6bcba6da-04bb-6d9a-e10c-f7607fb8a84c/05_marketing.png/320x480bb.jpg) - [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/4a/c0/16/4ac016aa-8674-d541-ed81-d77e45e31e7e/06_marketing.png/320x480bb.jpg) - [Screenshot 7](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/f6/54/db/f654db92-299d-81bd-a566-2c77d5235eaa/07_marketing.png/320x480bb.jpg) - [Screenshot 8](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c4/25/2c/c4252c60-0bdb-2a2b-865f-b21b204cb3d1/08_marketing.png/320x480bb.jpg) - [Screenshot 9](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/2e/1e/e6/2e1ee679-b672-9eca-d0fc-5d2912031d2e/09_marketing.png/320x480bb.jpg) - [Screenshot 10](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/9c/8f/08/9c8f08a1-0dea-51ea-adaf-8242d54a54f8/10_marketing.png/320x480bb.jpg) ## ACS Gas Pro Rating Breakdown in United Kingdom - 5 stars: 280 (86%) - 4 stars: 27 (8%) - 3 stars: 7 (2%) - 2 stars: 2 (1%) - 1 stars: 8 (2%) ## ACS Gas Pro Reviews in United Kingdom ### ***** "Great for revising CCN1 safety" I used this during my CCN1 revision and the explanations made a big difference. The questions are clear and the sub-topic grouping helps me target weak areas, like flues/spillage and emergency actions. Offline mode also comes in handy on site or between calls. -- Illiyana Adelsberg, 2026-05-28 ### ***** "Flash cards speed up recall for re-sits" For my re-assessment, I needed faster recall and the flash cards worked well. I’d do a quick round after reading explanations, then focus on the modules that were still uncertain. The app runs smoothly and the charts show progress over time. -- daymin^fernankuwvyhy, 2026-05-22 ### ***** "Amazing" This is great prep tool as well as all calculators and QR screens make it very handy on job -- Olabola12376, 2026-05-20 ### *---- "IET wiring regulations questions" This app used to be the fully unlocked Electrical IET wiring regulations questions. This new update has completely changed its functionality to the Gas safe regulations. How was this approved?! It’s clearly gaming the App Store because it’s launching a brand new app off the back of the old one because it has high reviews. I’ve never seen an app do this before. I complained to the developer and was given a link to an app similar to the original app but only subscription based. I’d payed for a fully unlocked version originally. The “new” app also has predatory rates. £10 per month or £30 per year. With no option to fully unlock. -- DeanDMX, 2026-05-19 ### *---- "Questions are all the same" All the questions are the same never change pointless -- DrippyFFA, 2023-03-25 ### ***-- "Great app but a couple of flaws" The app is great and very useful. However I’ve come across a few questions with typos or some even relating to regulations that have been deleted In the latest book. -- Theok2, 2022-10-23 ### *---- "Absolute garbage" Been using this app for couple of weeks, what an absolute piece of crap they put together Don’t waste your money -- SonyBraviaOwner, 2022-09-02 ### ***** "Passed first time with this app" 5* app Had a lot of questions from this app in the real exam. It even tells you the reference so if you get a question wrong you can look it up. Well done! -- Kingsley clay, 2019-02-16 [View all ACS Gas Pro reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews) ## ACS Gas Pro In-App Purchases | Item | Price | |------|-------| | Full Question Bank | £14.99 | ## Apps Similar to ACS Gas Pro - [LGV & HGV Theory Test Tool Kit](https://apptail.io/app/lgv-hgv-theory-test-tool-kit-EJmd/united-kingdom) - [Grammar Express: Articles Lite](https://apptail.io/app/grammar-express-articles-lite-ZmBd/united-kingdom) - [UK Motorcycle Theory Test](https://apptail.io/app/uk-motorcycle-theory-test-Flhe/united-kingdom) - [Motorcycle Permit Test Lite](https://apptail.io/app/motorcycle-permit-test-lite-Hlhe/united-kingdom) - [Fricatives Articulation](https://apptail.io/app/fricatives-articulation-gswe/united-kingdom) - [Algebra Review - GRE® Lite](https://apptail.io/app/algebra-review-gre-lite-FPSf/united-kingdom) - [ADI PDI Theory Test & Tool kit](https://apptail.io/app/adi-pdi-theory-test-tool-kit-btdg/united-kingdom) - [NISM Exam Prep](https://apptail.io/app/nism-exam-prep-ZmQq/united-kingdom) - [Fire Alarm Prep: NICET 2026](https://apptail.io/app/fire-alarm-prep-nicet-2026-mOZy/united-kingdom) - [Boiler Fault Finding](https://apptail.io/app/boiler-fault-finding-zgqz/united-kingdom) ## ACS Gas Pro Available In - [United Kingdom](https://apptail.io/app/acs-gas-pro-Pgae/united-kingdom) - [Canada](https://apptail.io/app/acs-gas-pro-Pgae/canada) - [Denmark](https://apptail.io/app/acs-gas-pro-Pgae/denmark) - [India](https://apptail.io/app/acs-gas-pro-Pgae/india) - [Poland](https://apptail.io/app/acs-gas-pro-Pgae/poland) - [Türkiye](https://apptail.io/app/acs-gas-pro-Pgae/turkey) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. 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