A. O. Smith ProLine & ProLine Master atmospheric vent gas tanks

A. O. Smith Canada publishes ProLine and ProLine Master as its conventional atmospheric vent residential gas tanks, described by the manufacturer as residential water heaters with commercial-grade quality. Air is drawn from inside the home and the exhaust is vented into a chimney or through the roof, so the family suits a home that already has a suitable chimney or approved vertical vent route.

The published feature set centres on reliability and serviceability. A. O. Smith Canada states the thermopile pilot design is robust enough to withstand down drafts and environmental conditions, and that a CoreGard magnesium anode with a stainless steel core protects the tank against corrosion. The Canadian site links a specification sheet, a standard installation manual, a separate installation manual for the 75 gallon model and the residential warranty sheet, all cited here.

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 or ProLine Master for a project is confirmed at consultation, and CANRO names A. O. Smith among the brands it services on its own pages.