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Home My WebLink AboutWATER HEATER INFORMATIONCOMMERCIAL-GRADE RESIDENTIAL ELECTRIC WATER HEATERS © August 2019 A. O. Smith Corporation. All rights reserved. www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015 Page 1 of 2 AOSRE50608 ENHANCED HEATING ELEMENTS • Dual 4500 watt elements for fast recovery and reliable operation* • Incoloy stainless steel lower element lasts longer than a standard copper element DYNACLEAN™ DIFFUSER DIP TUBE • Helps reduce lime and sediment buildup and maximizes hot water output. Made from long-lasting PEX cross-linked polymer (diffuser design is not used on lowboy models.) HIGHER EFFICIENCY • Eco-friendly non-CFC foam insulation, heat traps and other features combine to yield a higher Uniform Energy Factor that maximizes savings on operating costs. COREGARD™ ANODE ROD • Our anode rods have a stainless steel core that extends the life of the anode rod allowing superior tank protection far longer than standard anode rods BLUE DIAMOND® GLASS COATING • Provides superior corrosion resistance compared to industry standard glass lining ENHANCED-FLOW BRASS DRAIN VALVE • Our residential water heaters have a solid brass, tamper resistant, enhanced-flow, ball type, drain valve • Uses a standard female hose fitting that allows for fast and easy draining during maintenance • Designed for easy operation, this valve includes an integral screwdriver slot that features a ¼ turn (open/close) radius, which not only permits full straight- through water flow but also a quick and positive shut off CODE COMPLIANCE • Meets UBC and ICC National Codes and listed with CEC • Complies with the Federal Energy Conservation Standards effective April 16, 2015, in accordance with the Energy Policy and Conservation Act (EPCA), as amended APPROVED FOR MANUFACTURED HOUSING • All residential electric water heaters are compliant with HUD Standards for mobile homes/manufactured housing CERTIFIED TO UL 174 FOR HOUSEHOLD ELECTRIC WATER HEATERS CSA CERTIFIED AND ASME RATED T&P RELIEF VALVE DESIGN-LISTED BY UNDERWRITERS LABORATORIES • Certified at 300 psi test pressure and 150 psi working pressure • Listed according to UL 174 standards governing storage tank-type electric water heaters 6-YEAR LIMITED TANK AND PARTS WARRANTY • For complete information, consult written warranty or go to hotwater.com PROLINE® STANDARD COMMERCIAL-GRADE RESIDENTIAL COMMERCIAL-GRADE RESIDENTIAL ELECTRIC WATER HEATERS © August 2019 A. O. Smith Corporation. All rights reserved. www.hotwater.com | 800-527-1953 Toll-Free USA | A. O. Smith Corporation | 500 Tennessee Waltz Parkway | Ashland City, TN 37015 Page 2 of 2 AOSRE50608 Male 3/4” water connections on 8” center. *Models ship with supplied insulation blanket. †For 10-year tank and 10-year parts warranty, change “E” to “P” in the model number (example: ENT-30 becomes PNT-30). Models requiring a lower wattage than what is listed in the minimum wattage column and showing the @ symbol, will change to a “W” suffix model number. “W” suffix models are available down to 1kW. (example: ENS-40 using 4,000 watt elements or less will become “ENS-40W”). Top T&P is not available on the 10 year lowboy models and the ENL-40. Dimensions and specifications subject to change without notice in accordance with our policy of continuous product improvement. DRAIN VA LV E ACCESS PANEL ACCESS PANEL T&P VA LV E T&P VA LV EANODE SECOND ANODE ROD FOR LOWBOYS OR OPTIONAL TOP T&P (All Other Models) JUNCTION BOX Model Number Nominal Capacity Rated Storage Volume First Hour Rating (Gallons) UEF Recovery @ 90°F Rise Gallon Per Hour Element Wattage 240V Dimensions in Inches Approx. Shipping Weight (lbs)Standard Minimum Maximum A B C Tall Models ENT-30†30 27 48 0.89 21 4500 1000 6000 46-1/2 39-1/2 19 95 ENT-40†40 36 53 0.92 21 4500 3500 6000 61-1/4 53-1/4 18 118 ENT-50†50 46 62 0.92 21 4500 @ 3000 6000 60-1/2 51-1/4 20-1/2 125 ENT-50W†50 46 45 0.88 11 -1000 2500 60-1/2 51-1/4 20-1/2 125 ENT-55†55 55 72 0.93 21 4500 2500 6000 56-1/2 48-1/2 24 145 Short Models ENSB-30*30 27 50 0.90 21 4500 1000 6000 39 30-1/2 20 95 ENS-30†30 27 47 0.89 21 4500 1000 6000 39-3/4 30-1/2 22 94 ENS-40†40 37 55 0.92 21 4500 @ 4500 6000 49-3/4 40-3/4 20-1/2 109 ENS-40W†40 37 41 0.88 18 -1000 4000 49-3/4 40-3/4 20-1/2 109 ENS-50†50 46 57 0.92 21 4500 2500 6000 49-1/4 40-3/8 23 161 Lowboy Top Connect Models ENLB-30*†28 26 43 0.89 21 4500 1000 6000 30 21-3/4 20 90 ENL-30†28 26 44 0.90 21 4500 1000 6000 31-1/4 21-3/4 24 115 ENL-36†36 33 51 0.92 21 4500 @ 4500 6000 32 24 24 118 ENL-36W†36 33 37 0.89 18 -1000 4000 32 24 24 118 ENL-40†38 35 50 0.89 21 4500 1000 6000 33-1/2 24 26 118 ENLB-40*†38 35 51 0.92 21 4500 @ 4500 6000 32 24 23 118 ENLB-40W*†38 35 38 0.90 18 -1000 4000 32 24 23 118 ENLB-50*†48 44 60 0.93 21 4500 @ 4000 6000 34 25 26-1/2 172 ENLB-50W*†48 44 40 0.91 16 -1000 3500 34 25 26-1/2 172 ENL-50†51 48 51 0.92 21 4500 4000 6000 36 25 26-1/2 172 For technical information call 800-527-1953. A. O. Smith Corporation reserves the right to make product changes or improvements without prior notice.