While leaving your coffee maker running all the time may not be the most energy-efficient option, there are certain advantages. For one, a constantly-on coffee pot will help keep your coffee warm and ready to drink. Secondly, if you have a programmable coffee maker, leaving it on can save you time in the morning. Finally, an always-on coffee pot will help keep your kitchen smelling fresh. Keeping the coffee maker on all the time will degrade the heating element and wiring and also add an extra cost to the maintenance of the machine.