MRCOOL HeatWise™ 4500 Watt Tall Electric Tank Water Heater - 40 Gallon Capacity, MTWH04540ET

The MRCOOL® HeatWise™ 40-Gallon Tall Electric Tank Water Heater delivers full-capacity hot water performance in a footprint engineered for tighter installations. At 19.3" in diameter and 59.9" tall, the MTWH04540ET trades floor space for height, making it the right call for utility closets, narrow mechanical rooms, and any application where a standard-diameter tank simply will not fit. The same 4,500W element at 240/208V powers the unit across a 90–150°F adjustable range, while an anti-bacterial enameled tank and ceramic-coated heating element build corrosion resistance into the core. A patented Rare Earth Anode rod outlasts conventional magnesium rods by 50%, and a self-cleaning flow guide handles sediment automatically so the tank stays efficient without manual intervention. AHRI Certified and cULus Listed, and backed by a 10-year parts warranty, a 10-year tank warranty, and a 1-year limited labor warranty.

• 40-Gallon Tall Configuration: The MTWH04540ET delivers a full 40-gallon hot water reserve in a tall, narrow profile measuring 19.3" in diameter and 59.9" in height, powered by a 4,500W element at 240/208V with a 90–150°F temperature range and a max working pressure of 149.39 PSI.
• Space-Optimized Footprint: With a diameter nearly 2.5" slimmer than the standard 40-gallon MTWH04540E, the ET configuration installs cleanly in utility closets, narrow alcoves, and mechanical rooms where a conventional tank cannot be accommodated.
• Anti-Bacterial Enameled Tank: A 2mm steel shell with a 0.25–0.5mm anti-bacterial enamel lining resists corrosion and inhibits bacterial growth, protecting water quality and structural integrity through years of continuous operation.
• Patented Rare Earth Anode Rod: MRCOOL®'s proprietary Rare Earth Anode rod outlasts standard magnesium anode rods by 50%, providing superior internal tank protection and a measurably extended service life.
• Ceramic-Coated Heating Elements: Enamel-coated heating elements resist scale and corrosion buildup, sustaining efficient heat transfer and reducing maintenance demands across the full service life of the unit.
• Flow Guide Self-Cleaning: An integrated flow guide agitates sediment during normal operation, continuously clearing mineral deposits before they degrade efficiency or compromise tank integrity.
• Durable Brass Ball Valve: A solid brass ball valve at the 3/4" NPT water connection delivers a corrosion-resistant, leak-proof shutoff that holds up where plastic fittings fail over time.
• Industry-Backed Warranty: Protected 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.