What is an underground tank?
An underground tank is a container with any part of its components (the tank or lines) below ground. Many underground tanks are 25 years old or over. Unlike newer tanks, these are not specially protected from corrosion.
What is an aboveground tank?
Aboveground tanks have their entire structure exposed. The bottom part of these tanks normally rests on a concrete foundation. They can be located in or outside of the home.
Indoor vs. outdoor installation
Indoor oil tanks generally last longer and are less likely to spill. An indoor oil tank should be located where it can be easily inspected but not damaged by normal household activities. Outdoor tanks are more vulnerable to extreme temperatures, rain, snow, ice, and external corrosion as well as vandalism. Oil tanks installed in a garage/driveway are a cause for concern as they can easily be damaged by vehicle impact.
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