What common issue can result from water contamination in heating oil?

Water contamination in heating oil is a significant concern because it can lead to corrosion of the oil tank. When water accumulates in the bottom of the tank, it creates an environment conducive to rust and corrosion. Over time, this corrosion can compromise the structural integrity of the tank, leading to leaks and potential environmental hazards.

In addition to corrosion, water in heating oil can lead to other problems such as fuel instability and microbial growth, which can clog filters and disrupt the fuel oil system. However, the key issue directly related to water contamination is indeed the corrosion of the oil tank, as this can have serious repercussions for the longevity and safety of the entire heating system.