As with the energy saver atmospheric combustion model, its direct vent counterpart is also designed for mobile homes. This version takes combustion air in from outside and then vents combustion gases directly back outside.
Direct Vent water heaters utilize a co-axial (pipe inside a pipe) vent pipe that takes air in from the outside (outer vent) and vents combustion gases directly back to the outside (outer vent). It is the perfect choice for situations with insufficient combustion air. No electricity required.