The most recent additions to Stiebel Eltron's tankless electric water heater product line are the DHC-E 20 and DHC-E 30 "whole house" units. In comparison with a tank-type system, the new DHC-E 20 and DHC-E 30 units offer an unlimited supply of hot water at an exact temperature, a reduction in the consumption of electricity of at least 10-20%, and a sleek design that frees up valuable living space. The DHC-E units have several temperature and flow sensors, which feed their readings into the unit's proprietary microprocessor control, which engages the heating elements in stages, achieving the desired temperature and an endless supply. Stiebel Eltron. Circle 7.