Intellihot’s iQ1501 tankless water heater delivers 1.5 million Btu. It offers 50% increased capacity from the iQ1000 model in a 680-lb., 30” wide unit. It supplies 41 gpm at a 70° F temperature rise nonstop and enables users to cascade and common-vent four units together for 164 gpm at 70° rise. It eliminates single-point failures using patented masterless controls, and can be used both indoors and outdoors.