10 Best 40 Gallon Electric Water Heater of December 2025

• Permaglas glass coating protects steel tank from corrosion and maximizes tank life
• Dynaclean diffuser dip tube helps reduce lime and sediment buildup while maximizing hot water output; made from long-lasting PEX cross-linked polymer
• CoreGard anode rode aluminum anode with stainless steel core protects tank against corrosion longer than ordinary steel anodes
• Durable, tamper-resistant brass drain valve
• Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)

A. O. Smith

• Say Goodbye to Odors – Eliminate your water heat odor problem by removing the rotten egg smell caused by hydrogen sulfide with our advanced powered anode rod.
• Permanent Corrosion Protection – Designed to replace your 40-80-gallon water heater’s hex head anode rod, it can help defend against any level of water hardness.
• Energy Efficient Design – By reducing mineral accumulation on the tank it can help improve the water quality while reducing stress on the tank to reduce energy costs.
• Quick and Easy Installation – We’ve included an easy-to-follow paper and step-by-step online PDF instructions to make installing your anode rod much easier.
• North American Quality – Manufactured right here in North America, our hot water heater anode rod not only extends the life of your tank but is backed by a 20-year warranty.

Corro-Protec

• Country of Origin:United Kingdom
• Package length:18.0"
• Package width:18.0"
• Package height:21.0"
• 40 A

Bosch Thermotechnology

• Highly durable
• This product adds a great value
• This product is manufactured in MEXICO

Rheem

• External digital thermostatic control with LED display (+/1 degree accuracy)
• Most advanced self-modulation, adjust power to meet hot water demand
• Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
• Simple installation – bottom 3/4 inch NPT water connections
• Threaded for easy replacement, simple installation, digital temperature display

Rheem

• Pex polymer lined heat trap nipples
• Aluminum anode rod
• 95 energy factor
• Model number: 6-30-EOLBS 100

Reliance Water Heater

• External adjustable digital thermostatic control with LED display (+/1 degree accuracy
• Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
• Simple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections
• 99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
• Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
• 54 A

Rheem

• Lifetime warranty
• Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
• Never run out of hot water with an ECOSMART tankless water heater
• Patented Self Modulating Technology and design
• ECOSMART tankless water heaters are 99.8-percent energy efficient.Uniform Energy Factor:0.98

Ecosmart

• Heavy gauge Steel tank
• Inner Dura glas lined tank fired at 1,600°f for optimum protection from the effects of corrosion
• Factory installed Brass drain valve on all models allows for easy draining of the unit which reduces sediment deposits extending tank life
• Factory installed Brass temperature/pressure relief valve
• American standard point-of-use electric water heaters are all certified at 300 psi test pressure and 150 psi working pressure. All tanks are also 100% hydrostatically tested at the factory

American Standard Water Heaters

• The heat tank less stainless Steel construction is a perfect fit for any applications near the ocean, like beach front properties, yachts, small boats, resorts and outdoor kitchens
• Heat tank less s series can also be used in highly sterile applications like commercial kitchens, hospitals, clinics, and even schools where cleanliness is of the highest importance
• Heat tank less s series saves valuable space with its compact size, the s series compared to tank Type water heaters, is small enough to fit any under counters installations, or even closets
• Heat tank less water heater saves you up to 60% on your water heating costs.Water proof construction allows you to easily and safely control the temperature by using our water proof interactive touch pad
• Dimensions: 11.5 x 9 x 4.5 inches

iHeat Tankless