Stiebel-Eltron’s new Accelera 220 E heat pump water heater has a new electronic anode for maintenance-free protection. It also has a self-cleaning evaporator with no filter, a digital display interface and a shorter stature. The Accelera, which has a 10-year warranty, requires just 650 watts and a full tank (58 gal.) at 149° F and yields 96 gal. at 104°.