| 摘要 |
An aquarium heater having a heat resistant plastic housing. A heat producing electric resistance wire is positioned in the plastic housing in an aluminum foil container. In one embodiment, the container is an aluminum foil pouch which encloses the heat producing electric resistance wiring. The aluminum foil pouch is filled with sand. In another embodiment, the aluminum container is an annular pan and the electrical resistance wire is coiled in the pan.
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