A. O. Smith’s Voltex hybrid electric heat pump water heaters’ improved line includes 50-, 66- and 80-gal. versions with Energy Factor ratings of 3.24, 3.17 and 3.06, respectively. Along with higher efficiency and savings, the models are dual voltage — both 208 and 240 VAC capable — and are quiet, operating at 51dBa. The models also feature four operating modes that maximize efficiency by matching heating requirements to environmental conditions, including a vacation mode programmable up to 99 days.