Courtesy A.O. Smith
A.O. Smith’s Voltex hybrid electric heat-pump water heaters, like this HPTU-50N 50-gallon model, offer up to four different modes—efficiency, hybrid, electric, and vacation. With up to a 3.24 EF rating, they can offer significant savings compared to tank-style heaters. This model boasts an EF greater than 2.0 and carries a six-year limited warranty.