110V - requires hard wiring. 1500W stainless steel element. Magnesium anode rod. Rectangular shape with 2'' of foam insulation. Glass lined tank for longer life. 6 year warranty on heater and 1 year warranty on parts for both commercial and residential use. Temperature/pressure relief valve included. Can be mounted both horizontally or vertically. Mounts on floor or wall. Meets ASHRAE 90.1. See Info Page for technical and installation specifications.