Differences Between Direct and Indirect Fire Heaters
February 14, 2019
Available in two forms, furnace vessels are manufactured as either direct fired or indirect fired heaters. Now, everyone can recognize a direct fired unit when it's seen in use. It's the model that comes attached to a burner assembly.
Like a thermos, perhaps full of piping hot tea, jacketed tanks use an additional layer of encircling material to regulate fluid temperatures. Unlike a thermos, the second layer isn't made of fragile glass.