The iQ1501 is new to the line of tankless hot water heaters. It delivers 1.5 million BTUs with no storage tanks required. It offers 50 percent increased capacity from the iQ1000 model, in a compact unit that’s just 680 pounds and 30 inches wide, and fits through most elevator doors. The tankless water heater supplies 41 GPM at 70°F temperature rise non-stop, and enables users to easily cascade and common vent four units together for 164 GPM at 70°F rise. The iQ1501 eliminates single-point failures using patented masterless controls, and can be used both indoors and outdoors.