Wood pellet fireplaces are becoming more popular, and as in any hot market, that means manufacturers must be competitive with new features to increase market share and gain more sales. Such competition breeds improvement, so these fireplaces have become quite sophisticated. For example, some models offer control panels or wall-mounted thermostats that allow you to turn the temperature up or down.
These controls work just like those of central heating systems, gauging the temperature and then adjusting the fireplace accordingly. The higher you set the control, the more pellets the fireplace will feed into the combustion chamber and burn. Lower the control, and the feeding process slows.