What is the difference between a plumber and a heating engineer?

Plum is a term for lead so plumbers originally worked with lead putty & paint, so you would call a plumber to fit windows or the lead piping for the water, but over the years plumbers have concentrated on the plumbing of water and the drains and they take plumbing qualifications Heating engineers have always concentrated on heating systems both design and maintenance, Lead can no longer be used so both plumbers and heating engineers use copper & plastic and because both types of installation work are now very similar the public think plumbers are Gas Experts especially since the demise as what was known as The gas board since the invention of the combination boiler which needs virtually no design as everything is built in then a lot of plumbers are now installing boilers (mostly Combination boilers) but unfortunately quite a few still only have there plumbing qualifications plus a basic CORGI registration which is why a lot of plumbers will install a boiler but not maintain it and is ...