A Direct Vent heater is used when conventional chimney venting is not an option and an electrical source is not close by. The heater must be installed near an outside-facing wall as it draws combustion air from outdoors using the included 90" coaxial vent pipe. The exhaust is vented outside without a blower meaning it operates silently. The GSW Direct Vent heater is ideal for tight installations where space is at a premium. It is suitable for closet installations due to direct-vent design not requiring an external power supply or chimney. This 33 gallon water heater features a sealed combustion chamber design, eliminating the need for a flammable vapour sensor; thermopile system which provides a robust pilot to withstand environmental conditions such as down drafts; LED indicator which gives visual confirmation that the pilot is on, and provides diagnostics and troubleshooting information; glass-lined tank to provide superior protection against the corrosive effects of hot water; and a top-mounted heavy-duty anode rod for added tank protection. Maintenance is simple with an easy-to-access combustion chamber and conveniently located drain valve.