From: On Demand

The RTG-66DV gas direct-vent, tankless water heater is designed for homes with two or three bathrooms. The unit measures 25?1/2 inches high, 13?1/2 inches wide, and 10 inches deep. The concentric venting system simplifies installation by expelling the byproducts of combustion through a 3-inch exhaust pipe inside the 5-inch intake run. The unit can deliver water at a rate of 6.6 gallons per minute. Installers can connect multiple units to meet the needs of high-demand applications. The product uses either natural gas or liquid propane. Energy factor: 0.82. 334.260.1500.