MRCOOL HeatWise™ 4500 Watt Electric Tank Water Heater - 40 Gallon Capacity, MTWH04540E

The MRCOOL® HeatWise™ 40-Gallon Electric Tank Water Heater is the workhorse choice for households that demand consistent, high-volume hot water without compromise. Powered by a 4,500W element at 240/208V and adjustable across a 90–150°F range, the MTWH04540E is engineered to keep pace with the daily demands of a busy home. Inside, an anti-bacterial enameled tank and ceramic-coated heating element form a corrosion-resistant core, while a patented Rare Earth Anode rod outlasts standard magnesium rods by 50%, standing guard against tank degradation for the long term. A self-cleaning flow guide handles sediment automatically, and a solid brass ball valve locks in a leak-resistant connection that holds up for years. AHRI Certified and cULus Listed, the MTWH04540E is backed by a 10-year parts warranty, a 10-year tank warranty, and a 1-year limited labor warranty.

• 40-Gallon Capacity: The MTWH04540E delivers a generous hot water reserve suited for medium to large households, driven by a 4,500W element at 240/208V, a 90–150°F adjustable temperature range, and a max working pressure of 149.39 PSI.
• Anti-Bacterial Enameled Tank: A 2mm steel shell lined with a 0.25–0.5mm anti-bacterial enamel coating resists corrosion and inhibits bacterial growth, protecting water quality and structural integrity across years of continuous operation.
• Patented Rare Earth Anode Rod: MRCOOL®'s proprietary Rare Earth Anode rod outlasts conventional magnesium anode rods by 50%, delivering superior tank protection and significantly extending the usable life of the heater.
• Ceramic-Coated Heating Elements: Enamel-coated heating elements resist scale and corrosion buildup, sustaining efficient heat transfer and reducing maintenance demands over the full service life of the unit.
• Flow Guide Self-Cleaning: An integrated flow guide agitates sediment during normal operation, flushing mineral deposits before they accumulate and erode efficiency or compromise tank integrity.
• Durable Brass Ball Valve: A solid brass ball valve at the 3/4" NPT water connection provides a robust, leak-resistant shutoff that outperforms plastic alternatives in durability and long-term reliability.
• Easy Installation: Standard 3/4" NPT water connections and a straightforward 240/208V electrical hookup simplify both replacement installs and new construction applications.
• Industry-Backed Warranty: Covered by a 10-year parts warranty, 10-year tank warranty, and 1-year limited labor warranty for single-family residential installations, with AHRI Certification and cULus Listing confirming compliance with North American safety and performance standards.