Yes. In fact, if they aren’t OFTEC approved, then they aren’t a legally practising oil engineer. Heating engineers are given a position of significant trust within our home. An improperly functioning boiler won’t just fail or work poorly, it could kill you.
A malfunctioning boiler may degrade into something referred to as ‘incomplete combustion’. This is what it is called when the oil or gas being burned in a boiler does not get enough oxygen. Instead of producing carbon dioxide, the boiler instead produces carbon monoxide. This gas is transparent, odourless, and can kill someone in minutes.
Always check to make sure that your heating engineer is OFTEC approved. Otherwise, they aren’t a heating engineer at all.