Zoo Med Reptile Heat Cable 100 Watts, 39 Feet Review (2026)

What a heat cable is built to do

Unlike a flat under tank heater pad, Zoo Med's Repti Heat Cable is a flexible, water-resistant cord that can be run under multiple tubs on a rack, coiled inside an enclosure, or wrapped loosely around branches and cage furniture, giving a keeper far more layout flexibility than a fixed-shape pad. At 39 feet, this cable is sized for larger installations, such as a breeder rack with several shelves of tubs, rather than a single terrarium, where a much shorter cable or a standard under tank heater pad would be the simpler choice. The first roughly 6.5 feet of the cable is an unheated cold lead, meant to run from the outlet to the start of the heated section without adding warmth along that stretch.

Wattage and where it fits in an enclosure lineup

At 100 watts, Zoo Med positions this cable as suited to tanks in the 50 to 100 gallon range when used as a primary heat source, though its more common use is as a secondary or rack-wide heat source spread across many smaller enclosures rather than one large tank. Because the cable is flexible rather than rigid, it works well for keepers building custom rack systems where a flat pad would not conform to the shelf layout, or for anyone who wants to route heat around or through cage furniture inside a naturalistic enclosure rather than only under the floor.

Installing and running it safely

Zoo Med recommends pairing this cable with a rheostat or thermostat, and calls that out specifically for warmer rooms, around 80 degrees Fahrenheit or higher, where an uncontrolled 100 watt cable could push temperatures higher than intended. Given the cable's length and total wattage, the thermostat or rheostat used needs to be rated to handle the full output rather than a smaller unit meant for a single heat mat, since running a device beyond its rated capacity is a fire risk regardless of brand. Installation is more involved than a pad heater, since the cable typically gets secured in place with clips, tape or by threading it through a rack's shelving before it is switched on and tested.

Trade-offs against simpler heat sources

The clear trade-off with a heat cable is complexity. A single under tank heater pad is close to plug-and-place, while 39 feet of cable requires planning a layout, securing it in place, and running it through a thermostat rated for its full wattage. In the site's heat cable guide, this listing ranks first of seven, ahead of shorter cables from Zoo Med's own lineup and Exo Terra, largely because its length suits larger rack builds that the shorter cables cannot cover in one run. For a single enclosure, though, one of Zoo Med's own shorter cables or a standard heat mat would be simpler to install and less cable than the job needs, with far less slack to route, secure and keep away from anything flammable inside a rack or cage.

Who should buy this cable

This is a good fit for breeders and keepers building or running a multi-shelf rack system who want one long, flexible heat source they can route across several tubs, paired with a thermostat or rheostat rated for the full 100 watts. It is not the right choice for a single terrarium, where the length is more than needed and a shorter cable or a standard under tank heater pad is simpler to install and control. Anyone new to heat cables should also budget for a properly rated thermostat as part of the purchase, since the cable alone is only half of a safe setup.

Frequently asked questions