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Gas Engineer Qualifications


When deciding to train to become a gas engineer, it’s essential to do your research. However, with multiple qualifications, awards and some confusing terminology, it can be a bit daunting. Here at Options Skills, we want to make it simple for you to understand. That’s why 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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Any person that works on a gas supply or gas installation in the United Kingdom must register with the Gas Safe Register (formerly CORGI). Many people, however, are unsure how to join the Gas Safe Register and of the qualifications and training required to do so.

ACS Gas Engineer Qualifications

Before an individual operative can apply to join the Gas Safe Register, they must demonstrate competence. Competence is usually demonstrated through qualifications. These qualifications are known as ACS (Accredited Certification Scheme) Gas Qualifications. For an individual to gain these qualifications, they must follow an approved managed learning plan that will include 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 that wish to get qualified and join the Gas Safe Register.

Types Of Gas 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’.

Commercial, Catering & LPG

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


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

ACS Reassessment

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 will not be able to renew Gas Safe Registration if they do not possess existing ACS Qualifications.

Up to 31st December 2020, Regulated qualifications and UKAS Accredited certificates of competence issued in the UK were widely recognised by other EU member states. However, since the UK’s withdrawal from the EU, individual member states that previously recognised a UK qualification may now no longer do so. Learners undertaking qualifications on the basis that it is recognised by an EU member state should, in the first instance, make enquiries with the relevant bodies in that Country to confirm its recognition status.

Gas Qualifications - Glossary of Terms

  • 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

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

A qualification covering the design and specification of basic domestic heating systems and size hot water storage cylinders.

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.

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

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

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

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.

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.

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.

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