With a Republic wood burning insert you can turn your old, inefficient open masonry or metal (ZC) fireplace into a great heat source for your home. A Republic insert is more than five times as efficient as an open fireplace and features a built-in convection chamber to circulate and distribute heat throughout your home. The model 1750i even features a bypass damper that allows easy and quick fire start-up. The Republic 1750i insert will provide your family with a reliable heat source - Even during power outages.