ProLine® 40-Gallon Short Electric Water Heater

Model ENS-40
Capacity (Gallons)
Limited Tank Warranty
Height Classification
Blanket
First Hour Rating
  • Delivers 55-gallon first hour rating
  • Dual 4,500-watt commercial-grade heating elements deliver reliable and efficient hot water
  • Long-lasting lower Incoloy™ stainless steel element
Product Details
  • Delivers 55-gallon first hour rating
  • Dual 4,500-watt commercial-grade heating elements deliver reliable and efficient hot water
  • 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-40 delivers a first hour rating of 55 gallons at an Uniform Energy Factor of 0.92. 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.

Specifications
Tech Specs
Nominal Gallon Capacity
40 Gallons
Rated Storage Volume
37 Gallons
UEF
0.92
Power Source
ELECTRIC
Limited Tank Warranty
6 Years
Limited Parts Warranty
6 Years
T&P Relief Valve
TRUE
Water Connection Location
TOP
Emissions
Low NOx
First Hour Rating
55 Gallons
ASME Certified
No
Blanket Included
No
Destination Country
US
Installation Type
INDOOR
Max Wattage
4,500
Number of Elements
2
Application
COMMERCIAL
Product Tier
ProLine®
Shipping Height 
53.5
Shipping Length 
23.69
Shipping Width 
21.5
Side Loop
No
Voltage
240
Dimension & Venting
Type
Water Heater
Diameter
20.5 in."
Shipping Weight
98lbs
Maintenance & Troubleshooting
Maintenance

ProLine® Electric Adjusting the Thermostat

ProLine® Electric Checking and Replacing Lower Heating Element.

ProLine® Electric Checking and Replacing Upper Heating Element.

Troubleshooting

ProLine® Electric Tripped ECO