Aquarium Heaters

Aquarium heaters by Rena France were some of the first automatic submersible heaters produced for the serious aquarium hobbyist. The RenaCal series of aquarium heaters introduced in the late 90's continues to offer superior thermal accuracy with the innovative use of direct thermal diffusion coupled with a 500-micron solid silver contact thermostat. Direct thermal diffusion allows the heating coil to actually touch the special heat-tempered glass tube. This method of heating rapidly transfers the heat energy to the water. Many aquarium heaters must heat the air in the tube first, which in turn heats the glass tube. This system is much less efficient and more difficult for the thermostat to accurately sense changes in the water temperature.

Contact thermostats have been used for many years to control aquarium heaters. In this type of thermostat, a heat-sensitive switch opens and closes contacts which operate a heating coil. These switches vary widely in quality and calibration, resulting in wide-ranging efficiencies among less-expensive heaters to accurately control the water temperature in the aquarium. There are two major features of the RenaCal thermostat that insure accurate temperature control. First, each thermostat is manufactured at the factory, calibrated by computer and tested in water for accuracy. Secondly, the 500-micron solid silver thermostat contacts eliminate contact welding that causes overheating.

The RenaCal Basic features a positive click dial that adjusts the temperature one degree at a time. With its easy to view power indicator light, over-sized suction cups for mounting horizontally or vertically, and full submersability with triple seals and a 6 foot cord, the RenaCal Basic provides all the features the serious hobbyist needs. The RenaCal Excel has all the great features of the Basic model with the added convenience of a lighted control dial that can be viewed from the top or side. Sizes available:

RenaCal Basic
• 50 WATT - 5 to 15 gallons (20 to 57 L) #700B
• 100 WATT - 15 to 30 gallons (60 to 114 L) #700C
• 150 WATT - 30 to 45 gallons (114 to 170 L) #700D
• 200 WATT - 40 to 75 gallons (150 to 284 L) #700E
• 300 WATT - 55 to 100 gallons (200 to 400 L) #700F

RenaCal Excel
• 50 WATT - 5 to 15 gallons (20 to 57 L) #700B
• 100 WATT - 15 to 30 gallons (60 to 114 L) #700C
• 150 WATT - 30 to 45 gallons (114 to 170 L) #700D
• 200 WATT - 40 to 75 gallons (150 to 284 L) #700E
• 300 WATT - 55 to 100 gallons (200 to 400 L) #700F

Replacement suction cups and clips are also available