The HOT-1 is a Hang On Tank model that uses the venturi device on the MAXI-JET 1200. We believe there is nothing in it’s class that touches the performance, and of course the build quality. We think you will agree. HOT-1 Specifications: - Overall Height: 25” - Space required behind tank: 4” - Space required above tank: 11.25” - Width required: 8” - Water Pump Included: Maxi Jet1200 - Waste Collector Compatible: No - Capacity: 50gal.