- Delivers 41-gallon first hour rating
- Single commercial-grade heating element available in minimum 1,000 kW
- Long-lasting lower Incoloy™ stainless steel element
- HUD compliant, approved for mobile homes/manufactured housing
- Patented Blue Diamond® glass tank lining protects against corrosion
- DynaClean™ automatic cleaning system protects against sediment build-up
- Stainless steel Coregard™ anode rod protects against corrosion longer than ordinary anodes
- Commercial-grade brass drain valve for durable and easy operation
- CSA Certified and ASME Rated T&P Relief Valve, Factory-Installed
- 6-year limited tank and parts warranty
The ProLine® Standard Electric water heater is the reliable choice when you are looking to maximize your hot water output and is designed with environmentally-friendly insulation to reduce standby heat loss. With a 40-gallon (nominal) tank delivering 4,500 watts, the ENS-40W delivers a first hour rating of 41 gallons at an Uniform Energy Factor of 0.88. Environmentally-friendly insulation and factory-installed heat trap nipples reduce heat loss for maximum energy savings. This ProLine® water heater is designed with A. O. Smith's superior commercial-grade tank protection. Advanced tank features include stainless steel Coregard™ anode rod, Blue Diamond® glass lining and DynaClean™ automatic sediment-cleaning system, all designed to help protect the tank from the corrosive effects of water and extend the life of the water heater. All of these features are accompanied by a 6-year limited tank warranty. A. O. Smith’s ProLine® water heaters are residential products built to commercial-grade standard and are only available for purchase through professional wholesalers and contractors.
ProLine® Electric Adjusting the Thermostat
ProLine® Electric Checking and Replacing Lower Heating Element.
ProLine® Electric Checking and Replacing Upper Heating Element.
ProLine® Electric Tripped ECO