GSW Direct vent gas tanks

The GSW Direct Vent is GSW's sealed-combustion gas tank for installations where conventional chimney venting is not an option and an electrical source is not close by. GSW states the heater must be installed near an outside-facing wall, because it draws combustion air from outdoors through the included 90 in coaxial vent pipe; the exhaust is then vented outside without a blower, so the unit operates silently.

The published feature set is aimed at tight installations: GSW lists the design as suitable for closet installations because it needs no external power supply or chimney, and describes a sealed combustion chamber design that eliminates the need for a flammable-vapour sensor. A thermopile pilot is listed to provide a robust pilot that withstands environmental conditions such as downdrafts, and an LED indicator gives visual confirmation that the pilot is on and provides diagnostics and troubleshooting information. The tank is glass-lined to protect against the corrosive effects of hot water, and a top-mounted heavy-duty anode rod adds tank protection. Maintenance is simplified by an easy-to-access combustion chamber and a conveniently located drain valve.

The line is documented here at family level because per-model capacities, inputs, first-hour ratings and efficiency figures sit in the linked Canadian spec sheet, which is the source used before any model row is published. Whether CANRO supplies a specific GSW Direct Vent model for a project is confirmed at consultation, and CANRO names GSW among the brands it services on its own pages.