AccuLux ThermoLux 463265 Heat mat (L x W x H) 35 x 25 x 0.4 cm Green

ThermoLux heating mats are made of water-proof and rot-proof materials, are absolutely watertight, and can be used without any danger in freshwater. They offer maximum safety due to the built-in, full-surface protective conductor. Always remove the plug from the power socket before cleaning the mat or working on the aquarium, to prevent danger of electric shocks.
The mats are connected by means of the plug direct to the 230V power supply, and at an ambient temperature of 20 °C, and without a cover, reach a maximum surface temperature of approx. 42 °C. The heating of the mat depends however on the under surface, the ambient temperature and the amount of substrate to be heated (sand, mulch, water etc.) and can take from several hours to days. When used without temperature limitation, take care to avoid overheating of the ThermoLux heating mat, since the mat can reach a temperature of over 100 °C if placed between dry substrates!