While electric heaters with aluminum coils are generally safe when used properly, there are some safety concerns to consider. Aluminum can heat up quickly and may become very hot, posing a risk of burns if touched. Additionally, aluminum coils can corrode over time, potentially leading to electrical shorts or fires. It's important to ensure that the heater is not covered or obstructed, as this can cause overheating. Always follow the manufacturer's instructions for use and safety precautions. Regularly inspect the heater for any signs of damage or wear, and never use a heater with a damaged cord or plug.