These new heaters bridge the gap between aquarium and commercial-duty heaters. Each heater consists of two parts; the heater element (glass), and the heater controller. The controller reads on C and is accurate to +- 0.5 C. has "power on" and "heater on" indicator lights and a 36" long temperature probe. Heater element power cord is 42" long 115V/60Hz. Not UL-listed. 1 year warranty.