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 gal. per min. 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.