Aquarium Pharmaceuticals' Rena Cal Top Light excel heaters offer many features we wish had been around for the last ten years, including: very accurate dial with click indents so you know where you're setting it, computer calibrated thermostat, double on/off indicator light-top and side and a unique, high-tech fiber optic system illuminates temperature reading on both top and side of the heater. Additionally, two easy-to-read temperature settings on the top and side of the temperature control knob allow control "one degree at a time" from 66°(18.9 C) to 90°(32.2 C). A decorative pattern on the glass tube helps camouflage the heater and adds to the beauty of the aquarium. These heaters are fully submersible and come with a six foot power cord.

Aquarium Pharmaceuticals Heater Recommendations