Re: Is it a legal requirement for businesses to annually certify their gas appliences
the business's have a legal duty of care to maintain the equipment. This could mean as little as a service once a year, or it could mean a service or safety check every month. it could be as simple as cleaning the oven or stove burners once a week. It depends on the equipment and how its used.
So you need to base it on all the variables, you cant just go on guidlines alone. each appliance must be maintain in a safe working condition. Consult the manufacturer's and find a good local engineer who has experience with the type of equipment you have.
any business should consider the question, if i got asked by a judge, inspector or insurance company could you prove you maintain the stuff correctly? if you cant then your open to problems if anything happens.