This water heater uses two 5, 500-watt, 240-volt incoloy heating elements inside the tank, one high up and one a bit lower, to warm the water. It preserves heat with a layer of polyurethane foam insulation as well as the tank’s ceramic lining.
If you have low ceilings in the part of the house where you want to keep this water heater, you are in luck, since it is fairly short. It stands only 50 inches high and has diameter, width and depth measurements of 24 inches each.