Exo Terra PTC Self Regulating Heat Mat 16W 30x20cm PT2033

The ET PTC Self Regulating Heat Mat 16W (PT2033) is a carbon fibre under-tank heater designed for reptile, amphibian, and invertebrate keepers who need reliable, even conductive heat across the vivarium floor. At 30x20cm and 16W, it suits a wide range of mid-sized terrariums and can serve as a primary or secondary heat source depending on the species and setup.

PTC Carbon Fibre Technology

This mat uses PTC (Positive Temperature Coefficient) carbon fibre heating elements, which self-regulate their output as temperature rises — reducing the risk of overheating without relying solely on external controls. The technology also delivers an electrothermal conversion efficiency exceeding 95%, meaning very little energy is wasted. An automatic fail-safe mechanism is built in as an additional safety measure.

Uniform Heat, No Hotspots

Unlike basic wire-element mats, the carbon fibre construction spreads heat evenly across the entire surface. This eliminates concentrated hotspots that can cause burns or discomfort, and instead creates a consistent warm zone that reptiles, amphibians, and invertebrates can use to thermoregulate naturally — supporting metabolism, appetite, digestion, and activity levels.

Thermal Gradient and Placement

The mat adheres permanently to the underside of the terrarium, forming a solid bond that maximises heat transfer through the glass. It is designed to cover only part of the floor area, leaving a cool zone on the opposite side — this thermal gradient is essential and should never be overlooked. Rubber spacers are included to allow safe airflow where needed.

Use With a Thermostat

While the PTC element self-regulates to a maximum temperature, Viperia strongly recommends pairing this mat with a suitable thermostat for accurate temperature management. For a more complete heating strategy, combining under-floor conductive heat with a radiant infrared basking bulb allows animals to thermoregulate from both above and below, more closely replicating natural conditions.

Supplied with rubber spacers. Available as part of a range in multiple sizes and wattages — this listing is for the 16W, 30x20cm (PT2033) variant only.