A. O. Smith ProLine Direct Vent gas tanks

A. O. Smith Canada publishes the ProLine Direct Vent as a balanced-flue gas storage water heater for homes without a suitable chimney. The manufacturer describes the design as a unique balanced flue: combustion air is drawn from outside and the exhaust is discharged outside, and a 90 in coaxial vent is supplied with the water heater. Because it uses a balanced flue and no powered vent, A. O. Smith Canada states no external power supply is required.

The line is published with a thermopile pilot design that A. O. Smith Canada says withstands down drafts and environmental conditions, and the manufacturer states the ProLine models are residential water heaters with commercial-grade quality and meet the latest NRCan energy efficiency standards. The Canadian site links a specification sheet, installation manual and the residential warranty sheet, all cited here, and states a 6-year limited tank and parts warranty.

The line is documented at family level because the per-model capacities, first-hour ratings and inputs sit in the linked Canadian specification sheet, which is the source used before any model row is published. A. O. Smith Canada does not print a numeric efficiency for the line on the product page, so none is recorded here. Whether CANRO supplies a ProLine Direct Vent for a project is confirmed at consultation, and CANRO names A. O. Smith among the brands it services on its own pages.