80 Gallon Electric Water Heater Vs Tankless . 80 gallon electric hot water heater is common in larger homes in palm beach county. The pros of switching to a tankless water heater. AO Smith PHPT80 80 Gallon Voltex Residential Hybrid Electric Heat from www.pexsupply.com 10 gpm gas tankless heater or at least a 27 kw electric tankless water heater if you live in the northern part of the usa. You see how this could take a long time to ask, let alone. Ecosmart eco 11 electric tankless water heater, 13kw at 240 volts with patented self modulating.