Second, the unit is small enough to squeeze into most inside utility rooms. At 10 x 12 x 15 inches and 45 pounds, it's much smaller than other HPWHs. Third, an optional duct flange transforms the heat pump into a ventilation system. Up to 30 feet of 8-inch duct can be attached to the inlet and outlet sides of the fan. The maximum air flow without ducts is 200 cfm.
Good locations are basements, utility rooms and garages.
This is welcome during hot weather, but can add to heating costs during cold weather. Connecting a duct to the exhaust side of the fan directs the cooled air outside, which eliminates the heating penalty. Connecting a duct to the inlet side allows the fan to ventilate high moisture areas. Crispaire indicates that attic air could be ducted to the unit. Despite its size, the unit can keep up with the hot water requirements of the average family by making 200-300 gallons of hot water per day.