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ProLine® 51-Gallon Lowboy Top Connect Electric Water Heater
ProLine® 51-Gallon Lowboy Top Connect Electric Water Heater Model PNL-50 120
  • 4,500-watt elements
  • 51-gallon first hour rating
  • 10-Year Warranty
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ProLine® 51-Gallon Lowboy Top Connect Electric Water Heater
ProLine® 51-Gallon Lowboy Top Connect Electric Water Heater Model ENL-50 120
  • 4,500-watt elements
  • 51-gallon first hour rating
  • 6-Year Warranty
View Model
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Standard residential 80-gallon electric water heaters have been unavailable since 2015 due to NAECA 3 regulations requiring electric storage water heaters above 55 gallons to use heat pump technology. Hybrid heat pump water heaters are available in this capacity. These larger tanks are also physically challenging to install at 65-75 inches tall and often won't fit through standard doorways or typical closet spaces.
Standard residential 80-gallon electric water heaters were discontinued in 2015 when NAECA 3 mandated heat pump technology for electric tanks over 55 gallons. Heat pump models in this capacity are available and use up to 70% less electricity than standard electric tanks. Starting May 6, 2029, new DOE regulations will extend the heat pump requirement to all electric tanks over 35 gallons
You can buy 80-gallon water heaters, but only as heat pump models for electric systems. Standard residential electric 80-gallon tanks haven't been available since 2015 due to efficiency regulations. Available alternatives include hybrid heat pump water heaters or gas tankless models. Many homeowners find that properly sized 50-65 gallon tanks or tankless systems meet their needs more efficiently.
An 80-gallon water heater suits large households with 5+ people, multiple bathrooms, or high-demand fixtures like large soaking tubs. For smaller households, it's oversized and wastes energy and money. Use A. O. Smith's XPERT Residential Water Heater Selector to determine the right size based on your usage patterns and local climate.


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A. O. Smith Smart Heat Pump Water Heater
A. O. Smith Smart Heat Pump Water Heater Receives Good Housekeeping 2026 Home Reno Award
JOHNSON CITY, Tenn., Feb. 17, 2026 — A. O. Smith, North America's largest water heater manufacturer, today announced its A. O. Smith Signature™ 900 Smart Hybrid Heat Pump Water Heater with Hot Water Plus was named a winner in Good Housekeeping's 2026 Home Renovation Awards. Available exclusively at Lowe's, the ENERGY STAR® certified line of smart hybrid heat pump water heaters was recognized in the "Sustainability Innovators" category for its ability to provide significant energy and utility savings in the home with maximum hot water delivery.
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Categories: Awards, News, Sustainability, Technology, Water Heaters
Pittsburgh quarterback wins the 2021 Johnny Unitas Golden Arm Award®
Pittsburgh quarterback wins the 2021 Johnny Unitas Golden Arm Award®
BALTIMORE, MD – Kenny Pickett has won the 2021 Johnny Unitas Golden Arm Award®, presented annually by the Johnny Unitas Golden Arm Educational Foundation, Inc. and A. O. Smith Corporation to the nation’s top quarterback who best exemplifies character, scholastic and athletic achievement. Pickett is the first Pittsburgh Panther to win this prestigious award.
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