ProMax® 40-Gallon Electric Water Heater ECS-40


The ProMax® 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 tank and 1 element delivering 4500 kilowatts, the ECS-40 delivers a first hour rating of 52 gallons at an Energy Factor of 0.92. The Coregard™ Aluminum Anode helps protect the tank from the corrosive effects of water, and is accompanied by a 6-year limited warranty.

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DynaClean™ Diffuser Dip Tube

Thanks to the improved technology, the inlet tube features water jets that redirect incoming cold water into the tank, creating turbulence, which helps reduce lime build-up, therefore maintaining heater efficiency.

CoreGard™ Anode Rod

A. O. Smith’s exlusive aluminum anode has a stainless steel core, which protects the tank against corrosion longer than ordinary mild steel anodes.

Brass Drain Valve

Our brass drain valve is more durable and tamper-resistant than an ordinary plastic drain valve, which contributes to improved safety and reliability.

Permaglas® Glass Coating

Protects steel tank from corrosion and maximizes tank life.

Tech Specs

Gallon Capacity: 40
Recovery Gallons: 21
First Hour Rating: 52
Energy Factor: 0.92
Thermal Efficiency: 98%
Upper Element Wattage: 4500
Lower Element Wattage: 4500
Max Wattage: 4500
Limited Tank Warranty: 6 Years
Limited Parts Warranty: 6 Years
Anode: Coregard™ Aluminum Anode
Foam Insulation: 2″
Self Cleaning: Yes
T&P Relief Valve: Yes
Water Connection Location: Top
Water Connection Size: 3/4″

Dimensions & Venting

Type: Short
Height: 44″
Diameter: 20 1/2″
Width: 20 1/2″
Depth: 20 1/2″
Shipping Weight: 103lbs/47kg



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