Stiebel Eltron DHX Trend electric tankless water heater switches on automatically as soon as a hot water valve at a tap or other draw-off point is opened. DHX heats water as it flows through the unit. When the tap is closed, the water heater switches off automatically. DHX Trend is electronically controlled tankless water heaters, and maintain a consistent outlet temperature. This is irre-spective of the inlet water temperature, up to the maximum output of the water heater. Certified to ANSI/UL Std. 499. Conforms to CAN/CSA Std. C22.2 No. 64. Tested and certified by WQA to NSF/ANSI 372 for lead free compliance. Dimensions: Height 14-1/8" (360mm) x Width 8" (202mm) x Depth 4-5/16" (109mm).