With an average efficiency rating of 87 percent, the Bosch ProTankless GWH 635 ES gas water heater delivers up to 6.35 gallons per minute and can supply two major applications at once, the maker says. The compact size and direct-vent, sealed-combustion design allows it to be mounted on a wall in a closet or other room. 800.495.1782. www.protankless.com. Circle 177
