Our iQ Series floor-standing units, iQ1501, iQ1001, and iQ751 deliver the ultimate in on-demand water-heating capacity. iQ1501 is Intellihot’s most powerful model and gives new meaning to “smart water.” It’s our highest capacity on-demand water heater yet, delivering 1.5 million BTUs with no storage tanks required.The iQ1001 delivers over 1 million Btu/hr and the iQ751 delivers over 751,000 Btu/hr, with no storage tanks. These high-input units are designed for very large volume applications.