Aquael Glass Heater 100W Platinium Heater
Conventional glass heaters for aquariums basically consist of a thermostat, thermostat contacts, and a heating coil. The thermostat controls the water temperature in the tank and, when necessary, switches the heating coil on or off by connecting or disconnecting the contacts. Thermostat contacts constitute the weakest link of this system. Although their operation is electronically assisted, metal oxidation gradually causes their surface to corrode. Corrosion shortens the useful life of the heater and decreases the precision of their operation.
It is a glass aquarium heater with a thermostat whose contacts are covered with a layer of gold.