Boilers, such wonderful things and so pervasive.  They're so ubiquitous that you only notice them when they don't work and by then, your life has already descended into a heap because of it.  It's a bit like the separation of powers. The separation of powers keeps the different levels of government from eating each other up and getting too big. The separation of powers is law as well as convention in Australia and you have a boilermaker or three to thank for that.