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Products > Heaters 2 Items found Sort items by Title Price Date   View as Slideshow Aquarium Pharmaceuticals Rena Cal 300w Heater View> Description: For 55 to 100 gallon aquariums. Computer-calibrated temperature control. Accurately adjusts water temperature one degree at a time. Fully submersible. High thermal diffusion for quick, efficient heating. 500-micron solid silver contact t... $21.95 In Stock (1) Quantity Add to Cart Aquarium Systems Visa-Therm Deluxe 300w Heater View> Description: Our most precise aquarium heater for the price - reliable performance with the least temperature fluctuation of any heater we carry. Use the no-slip knob to dial in the perfect temperature on its easy-read scale. Certified accurate to within one degree... $24.95 In Stock (1) Quantity Add to Cart