The commercial gas industry is a large industry and can provide a varied and rewarding career for tradesmen. It may involve working on large machinery and vast central heating systems in large industrial or commercial buildings. As the systems tradesmen work on are often larger than in the domestic sector, the risk is higher and therefore it is particularly important that they have the right qualifications before carrying out any work. Poorly carried-out commercial gas work can cause multiple serious injuries, serious damage to property and even death. Commercial gas tradesmen must be registered on the Gas Safe register as a qualified commercial gas engineer.

Tradesmen who already work in the gas industry, with either a domestic ACS certificate or previous experience as a Gas Safe operative, can take commercial gas coursesto learn the additional skills and knowledge required for them to take an ACS assessment. They will learn through both theory and practical exercises and will learn about many areas, including legislation, safety, pressure, industrial pipe work, industrial and commercial appliances, flue analysis, control systems, combustion and sound testing. Once they have successfully passed the ACS assessment they can apply to be on the Gas Safe register for commercial gas engineers. It is a legal requirement that anybody working with gas is on the Gas Safe register.

Those who wish to enter the commercial gas industry but have not done any normal gas training will need to undertake suitable gas training coursesbefore they can go on to train in commercial gas.