Gas Engineer
Qualifications Explained

When deciding to train to become a gas engineer, it’s essential to do your research. However, it can be a bit daunting with multiple gas engineer qualifications, awards, and some confusing terminology.

Gas engineering is a regulated job, which means you must hold specific qualifications to be legally allowed to work. 

Here at Options Skills, we want to make it simple to understand. As a result, we have put together this easy-to-follow guide. If you’re looking to enter the industry, these are all the gas engineer qualifications you need to know.

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Gas Engineer Qualifications & Definitions

Before an individual operative can apply to join the Gas Safe Register, they must demonstrate competence. Competence is usually shown through qualifications. These qualifications are known as ACS (Accredited Certification Scheme) Gas Qualifications.

To gain these qualifications, an individual must follow an approved managed learning plan that includes training and instruction in a safe and supervised environment, work experience with a registered gas engineer and final assessment in an accredited gas training centre.

This training is known as gas foundation training and is aimed at people who wish to qualify and join the Gas Safe Register.

Gas engineer qualifications are not evergreen. Engineers must renew their qualifications every 5-years at an approved ACS Training & Assessment Centre. Renewal ensures that every operative is aware of current legislation and best practice.

A gas operative cannot renew Gas Safe Registration if they do not possess existing ACS Qualifications.

ACS Gas Engineer Qualifications are varied and split by gas types, i.e. Natural Gas and LPG. These are then divided by categories, Domestic, Commercial or Catering and by appliance, meaning that an operative must be suitably qualified by gas type, category, and appliance before working on an appliance. The reverse of a Gas Engineers Gas Safe Card will show precisely what appliances an operative is qualified to work on.

The traditional route for gas engineers is to obtain Domestic ACS Gas Qualifications, known as the ‘domestic suite’.

Operatives may choose to gain commercial, catering or LPG qualifications with change-over qualifications. For many people, this decision is based on their work and where they live in the country. For instance, you may want LPG Gas qualifications if you live in a rural area.

  • CCN1 – Core Gas Safety (Includes CPA1 – Flue Gas Analysers)
  • CENWAT – Central Heating Boilers
  • CKR1 – Gas Cookers
  • HTR1 – Gas Fires
  • CODNCO1 – Change over core gas safety from Domestic to Commercial
  • CDGA1 – Commercial direct fired heating appliances
  • CIGA1 – Commercial indirect fired heating appliances
  • CORT1 – Commercial overhead radiant heaters
  • ICPN1 – Installation first fix commercial pipework
  • ICAE1 – Installation of commercial appliances
  • TPCP1A – Testing and direct purging of low-pressure commercial pipework not exceeding 1m3
  • TPCP1 – Testing and direct purging of commercial pipework exceeding 1m3 in volume up to 7 bar
  • CCP1 – Commissioning indirect gas-fired plant and equipment
  • CBHP1 – Gas boosters and compressors
  • CGFE1 – Gas fuelled engines
  • CLE1 – Commercial laundry equipment
    • CODC1 – Change over core domestic to Core Commercial Catering
    • CCCN1 – Core Commercial Gas Safety
    • COMCAT1 – Boiling Burners; COMCAT2 – Water Boilers
    • COMCAT3 – Deep Fat & Pressure Fryers
    • COMCAT4 – Fish & Chip Ranges
    • COMCAT5 – Forced Draught Burner Appliances
    • COCATA1 – Change over Domestic to Commercial Appliances
    • CONGLP1 – Fuel changeover Natural Gas to LPG
    • COCNCL1 – Change over Core Commercial Catering Natural Gas to LPG
    • CMCLP1 – Core Commercial Mobile Catering; CMCALP1 – Open Top Boiling Rings
    • CMCALP2 – Fryers
    • CMCALP3 – Water Pressure or Expansion Boilers
    • CMCALP4 – Instantaneous Flued Water Heaters

    Engineers may also consider adding renewable qualifications and certifications to their skill set in line with the UK’s drive towards greener energy. Though gas boilers will continue to heat much of the nation for many years, now is the time for engineers to begin gaining knowledge and experience in other areas of heating, preparing them for future changes.

    • HSD1 – Central Heating & Hot Water Design
    • Part L – Heat Efficiency
    • LTHWS – Low-Temperature Design
    • IMASHPS – Air Source Heat Pump
    • Installation and Maintenance
    • IMHPS21 – Ground Source Heat Pump Installation and Maintenance
    • G3 – Unvented Hot Water Systems
    • WRAS -Water Regulations

    Find out more: Heat Pump Courses

    Unvented Hot Water System training has been designed for plumbing and heating engineers to demonstrate understanding and competency in installing, servicing, and maintaining domestic hot water systems.

    Find out more: Unvented Hot Water (G3)

    A qualification designed for qualified gas engineers with experience installing wet central heating systems.

    Find out more: Ground and Air Source Heat Pump Course

    A qualification designed for qualified gas engineers with experience installing wet central heating systems.

    Find out more: Ground and Air Source Heat Pump Course

    A qualification designed for qualified gas engineers with experience installing wet central heating systems.

    Find out more: Low-Temperature Heating Design (LTHWS) 

    The part L qualification will allow students to understand and be competent when carrying out the design of heating systems in accordance with Part L of the Building Regulations.

    Find out more: Energy Efficiency (Part L)

    MCS are an industry-led scheme demonstrating the quality and reliability of products and installation companies in the low-carbon sector used to produce electricity and heat from renewable sources.

    Find out more: (MCS) Microgeneration Certification Scheme

    WRAS certification is essential for plumbers and engineers looking to join their local water authorities Water Industry Approved Plumber Scheme, a plumbing competent person schemes (CPS) or Microgeneration Certification Scheme (MCS) registration bodies.

    Find our more: Water Regulations (WRAS)

    Trainee gas engineer working on a boiler in the workshop
    Trainee gas engineer learning to bend copper piping in the workshop

    See What The Students Say About Our Domestic Gas Training

    Martyn Wheale
    Martyn Wheale
    Just finished my heat pump training at Purley training center couldn’t fault it . Sean the teacher was fantastic very helpful and I would recommend this centre to anyone thinking about doing heat pumps. Will definitely use them again when renewing my gas certs .
    iliyan stankov
    iliyan stankov
    David Cox
    David Cox
    Done a heat pump course without any knowledge of heat pumps what do ever, well thought out course without frying your brain. Only downfall was the instructor teased us with cookies on day and failed to produce the following days!
    Timothy Bamford
    Timothy Bamford
    Great place to study
    Mozibul HOQUE
    Mozibul HOQUE
    Jacko is an excellent teacher. I like the way he teach and solve the questions.
    adrian cross
    adrian cross
    Absolutely fantastic course, jacko covered all topics perfectly and I have a full understanding of ashp's

    Course Locations

    Birmingham Electrical, Gas and Plumbing Training Centre
    Gas Training In


    Manchester Electrical, Gas and Plumbing Training Centre
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    Wembley, North London Electrical, Gas and Plumbing Training Centre
    Gas Training In

    North London

    Purley, South London Electrical, Gas and Plumbing Training Centre
    Gas Training In

    South London