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.
Call Evan if you need more information or repair service on direct vent water heaters.
Factory link for Bradford-White Direct Vent Water Heaters here