A.O. Smith ECS-40 ProMax 40-Gallon 4500W Short Electric Water Heater

IMPORTANT NOTE: This product was officially discontinued by the manufacturer on September 16, 2012.

The A.O. Smith ProMax Short 40-Gallon Residential Electric Water Heater (ECS-40) is designed to offer exceptional energy savings and durability in a space-saving footprint. Perfectly suited for households of 2 to 3 people, it features advanced tank protection, high-efficiency insulation, and reliable heating elements to ensure a steady supply of hot water while minimizing energy costs.

• Model Number: ECS-40
• Capacity: 40 Gallons (Short Configuration)
• Fuel Type: Electric (240V / 4500W / Dual Elements / 6 KW Max Input)
• Household Size: Ideal for 2-3 person households
• Dimensions & Weight: 44" Height x 20-1/2" Diameter; weighs 115 lbs
• Performance Metrics: 52-gallon first-hour delivery, 21 GPH recovery at 90°F rise, 0.92 Energy Factor, and an R-16 insulation value
• Tank Protection: Features a Coregard aluminum anode rod with a stainless steel core and Permaglas glass coating to protect the solid steel tank from rust and corrosion
• Sediment Reduction: Dynaclean PEX cross-linked polymer diffuser dip tube minimizes lime and sediment buildup to maximize hot water output
• Valves & Fittings: Includes a durable, tamper-resistant brass drain valve and a CSA-certified, ASME-rated T&P relief valve
• Certifications: Certified to UL 174 for household electric water heaters; meets or exceeds NAECA and ASHRAE/IESNA 90.1 efficiency standards
• Warranty: Originally backed by a 6-Year Tank and 6-Year Parts Limited Warranty

Most in-stock items ship within 1–3 business days. Once shipped, you will receive a confirmation email with tracking. Special-order items or items shipped from partner warehouses may require additional processing time. Orders ship via UPS or USPS depending on the item and destination. If you need a specific carrier, please contact us before placing your order.