Zip ES Compact Electronic Instantaneous Water Heater with Bare-Wire Heating System is the most energy efficient way to directly heat water electrically and heating power is controlled electronically to maintain set temperature with WRAS and VDE approved.- The most energy efficient way to directly heat water electrically- Zip InLine ES provides instant hot water for handwashing- Double pole over-temperature protection- Safe operation without the need for a thermostatic blending valve- Stainless steel bare wire heating element for fast heat up