Single element. Bottom entry. Pre-installed temperature and pressure relief valve. Adjustable thermostat. Glass-lined tank. Foam insulation. Capacity: 45 L (10 Gallons). Power : 120VAC and 1500W. Water connections : 3/4" (1.9cm) NPT. Maximum water pressure : 150 psi. Dimensions of 22 3/4'' x 16'' (57.8cm x 40.6cm). Compact space saver, water heater for RV's, boats and cottages. Can be installed under the counter 1" (2.5cm) foam insulation.