Under tank heater that creates a warm area on the bottom of the terrarium. Self-adhesive for easy installation.
Easy installation
Energy efficient
Creates natural heat gradient
Multiple sizes
No thermostat included
Can overheat without thermostat
Adhesive is permanent
Effectiveness: 8/10 · Safety: 7/10 · Value for Money: 9/10 · Ease of Use: 8/10
These are our own scores for the things that can be judged from the specification, the materials and how the product is built. They are not Amazon's customer rating.
Never run an under-tank heater without a thermostat. Not overnight, not "just to test it".
Under-tank heaters have no internal temperature control. Plugged directly into the wall they run at full output indefinitely, and the surface above can reach temperatures that cause serious burns.
The reason this matters more for reptiles than it would for a mammal: many species have poor thermal receptors on the belly, which is exactly where this heat is applied. An animal can sit on a burning surface and not move. Thermostat-related burns are among the most common preventable injuries in home reptile keeping, and a thermostat costs a fraction of the vet bill.
Use an on/off or pulse-proportional thermostat, with the probe secured on the surface the animal actually lies on, inside the enclosure — not taped to the outside of the glass, which reads the wrong thing in the wrong place.
Many terrestrial reptiles digest using heat absorbed through the belly from warm ground rather than from warm air. A snake that cannot reach adequate belly temperature may fail to digest a meal and regurgitate, which is a serious event.
That makes a thermostatted under-tank heater the right tool for terrestrial snakes such as corn snakes and ball pythons, for leopard geckos, and for similar ground-dwelling species.
It is the wrong tool for basking species. A bearded dragon needs overhead radiant heat and light from above, the way the sun works — a mat cannot deliver the basking surface temperature or the light those species require.
Under one end only, never the whole floor. A thermal gradient is the point: the animal must be able to move to a genuinely cool end.
The adhesive is permanent. Think before you stick — removing it cleanly from glass is very difficult and people damage tanks trying. Many keepers deliberately skip the adhesive and tape the mat to the stand or rest the tank on it instead.
Leave the air gap most mats require beneath them. Heat trapped under a mat pressed flat against a wooden shelf builds up.
Never inside the enclosure, and never where the animal can burrow directly down onto it. Substrate on top insulates the mat, the mat runs hotter to compensate, and the animal digs to the hottest layer.
With an infrared temperature gun or a digital probe, at the surface the animal sits on, with the substrate in place as the animal will find it. Stick-on dial thermometers on the glass are close to useless.
Re-check after any change to the setup — new substrate, a moved hide, a different room temperature.
Mats fail, usually by simply stopping. An animal that has quietly had no belly heat for a week is a real problem, so check the mat is actually warm each time you check temperatures.
They also age. A mat that is years old, creased, or has damaged film should be replaced rather than nursed along.
It does not raise ambient air temperature meaningfully. In a cold room, a species that needs warm air as well as a warm surface will need a thermostatted ceramic emitter or radiant heat panel in addition.
It does not provide light or UVB. Diurnal species need both, on a day-night cycle.
Always. Under-tank heaters have no internal temperature control and run at full output indefinitely when plugged straight into the wall. Many reptiles have poor belly thermal receptors and will not move off a surface that is too hot, which is why unregulated mats cause serious burns.
Under one end of the enclosure only, never the whole floor, so the animal has a real thermal gradient. Leave the air gap the mat requires beneath it, and never put it inside the enclosure or where an animal can burrow down directly onto it — substrate on top makes the mat run hotter.
Terrestrial species that digest using heat absorbed through the belly — corn snakes, ball pythons, leopard geckos and similar ground dwellers. Basking species like bearded dragons need overhead radiant heat and light instead; a mat cannot give them the basking surface temperature or the light they need.
With an infrared temperature gun or a digital probe at the surface the animal actually lies on, with the substrate in place. Stick-on dial thermometers on the outside of the glass measure the wrong thing in the wrong place, and re-check after any change to the setup.
With difficulty, and people damage tanks trying. The backing is designed to be permanent. Many keepers deliberately never use the adhesive at all — taping the mat to the stand or resting the tank on top works and keeps your options open.