Fire safety. Now there's a merit badge in the making! We are surrounded by heating appliances that rely on a flame to work, but we take for granted that they'll all work safely. Every listed fuel-burning appliance, from the gas logs in the living room to that oil-fired boiler in our basement, is a candidate for a fire safety merit badge.
A shutdown mode has to be incorporated into the appliance in case the flame goes out. The intent is to control the flow of fuel. Let's take a quick look at the oil heat industry's primary control, focusing on the advancements made possible by microprocessor-based controls.