Do aquarium heaters contain mercury?

I have an aquarium heater in my fish tank and I would like to know whether aquarium heater’s contain any mercury within them.

Modern Aquarium Heaters do not use mercury – the switching mechanism is a bimetalic bar which curls one way when hot – and switches off the heater, and curls the other way when cold and switches on the heater. These movements are very small and well calibrated. No mercury is used.

Under-Gravel Aquarium Heaters for a 5 Gallon Tank?

Posted in Aquarium Heaters

4 Responses to “Do aquarium heaters contain mercury?”

  1. Epic S says:
    January 17, 2010 at 3:45 pm

    i should hope not! :)
    References :

  2. Larry says:
    January 17, 2010 at 3:57 pm

    No they do not.
    References :

  3. Ianab says:
    January 17, 2010 at 4:40 pm

    NO, why would they?

    They contain Nickel/chrome wire, plastic, ceramic, copper and glass. They are about as dangerous to the enviroment as a toaster.

    Ian
    References :

  4. Lofty says:
    January 17, 2010 at 5:07 pm

    Modern aquarium heaters do not use mercury – the switching mechanism is a bimetalic bar which curls one way when hot – and switches off the heater, and curls the other way when cold and switches on the heater. These movements are very small and well calibrated. No mercury is used.
    References :

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