A. O. Smith’s improved line of Voltex hybrid electric heat pump water heaters includes 50-, 66- and 80-gal. versions with EF 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 51 decibels A-weighting. 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.