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Gallon/435 and 662 Litre Models Rheem-Ruud commercial storage tanks are vertical tanks designed for applications that require large quantities of hot water in short periods of time. When used in tandem with Rheem-Ruud commercial water heating equipment, these storage tanks provide the flexibility needed for many Commercial applications. Installed individually, or in parallel manifold, these storage tanks can provide 80% draw capability without an appreciable temperature decrease in single tempe