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Big Power, Small Package. According to Rheem, the 29-gallon XR90 Extreme Recovery Gas Water Heater exceeds the performance of most 50-gallon water heaters but costs less to operate than any standard 30-, 40-, or 50-gallon model. The appliance has an Energy Factor of .70, a first-hour rating of 90 gallons, and a recovery rate of 61 gallons per hour (at a 90°F rise in temperature). The company attributes the XR90’s efficiency to a baffle and flue design that retains the burner’s heat longer. Pricing ranges from $750 to $950. Rheem Manufacturing Co., 800/621-5622, rheem.com