Rheem unveiled the new High- Efficiency Condensing Power Direct Vent (PDV) Water Heater. This ENERGY STAR®-qualified water heater is the first in the industry to employ high-efficiency condensing technology in a residential tank design. The Rheem High-Efficiency Condensing PDV unit achieves a 0.80 Energy Factor (EF), which is the highest EF available today for residential tank-type water heaters. Most typical gas-fired storage water heaters have a 0.59 EF and even ones that are Residential ENERGY STAR (Version 2.0) -
qualified are only required to have a 0.67 EF (source: U.S. Environmental Protection Agency).