John Wood Envirosense SF condensing gas tank

The John Wood Envirosense SF is the manufacturer's fully condensing side-fire storage water heater, published for the everyday home with a 93% thermal efficiency and ENERGY STAR qualification. John Wood states the fully condensing design can deliver continuous hot water at a constant flow of over 2.5 gallons per minute.

The footnote on that figure states it is based on a 65,000 BTU unit at 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, so it describes a specific set of conditions rather than a whole-home sizing result. The published feature set includes a unique side-fire design that John Wood states allows optimal burner placement, a single design that can be power vented and power direct vented, side-mounted hot and cold recirculating taps that allow the unit to be installed as part of combination space-heating and water-heating applications, and dual sacrificial heavy-duty anodes that come standard to protect the tank.

John Wood 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 family is documented at line level because per-model inputs and capacities sit in the linked Canadian 110 and 120 series spec sheets, which are the source used before any model row is published. Whether CANRO supplies an Envirosense SF for a project is confirmed at consultation.