GSW Envirosense SF condensing gas tank

The GSW Envirosense SF is GSW's fully condensing gas storage water heater for the everyday home. GSW states it provides flexible, powerful and highly efficient performance, and that the fully condensing design can deliver continuous hot water at a constant flow of over 2.5 gallons per minute. The manufacturer's footnote states that continuous-flow figure is based on a 65,000 BTU unit, 2.8 GPM continuous flow with a 65 degrees F inlet water temperature, 110 degrees F outlet temperature, and installation per the manufacturer's instructions.

The published feature set includes ENERGY STAR qualification with 93% thermal efficiency, a condensing design that GSW states saves money on operating costs, a unique side-fire design that allows optimal burner placement, and a single design that can be power vented and power direct vented. Side-mounted hot and cold recirculating taps allow the unit to be installed as part of combination space-heating and water-heating applications, which this site covers on its recirculation and component pages. Dual sacrificial heavy-duty anodes come standard to protect the tank.

GSW states the Envirosense SF is available in natural gas. WaterHeating.ca records the efficiency as a thermal-efficiency figure and does not convert it to a UEF, because the two metrics are not interchangeable. The line is documented here at family level because per-model capacities, inputs and first-hour ratings sit in the linked Canadian spec sheet, which is the source used before any model row is published. Whether CANRO supplies a specific Envirosense SF model for a project is confirmed at consultation.