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1. | A O Smith Water Heater Den & Del Manual Designed for use as a recovery heater having its own storage tank. Available in upright standard models (DEN) and lowboy models (DEL). COMMERCIAL ELECTRIC WATER HEATERS DEN & DEL MODELS Meets or exceeds the requirements of ASHRAE 90.1b-1992 Standard for energy efficiencies. See page C 029.0 for service wiring and fuse selection. FEATURES GLASS-LINED TANK - Thirteen sizes; 6 thru 119 gallon (22 thru 450 liter) capacity. Tank interior is coated with glass specially developed by A. O. S... Brands:A | User Manual | ENGLISH | [View] | ||||||||||