The new Rheem PowerVent 2 Induced Draft Gas Water Heater combines improved installation flexibility and greater energy efficiency to meet the needs of single-family homes that require side-wall venting for their gas appliances. The PowerVent 2 features electronic ignition, a quiet blower, and an electronic control that integrates the thermostat and gas valve into a compact unit that is mounted to the front of the water heater. This control uses a blinking LED light to monitor operating conditions. Available in 40-gal. and 50-gal. capacities with inputs of 40,000 Btu/hr, the PowerVent 2 offers energy efficiency ratings of .64 and .65 EF respectively. Rheem Water Heaters.