Slomins tech said I needed to put in an above ground tank, this for the reason my burner kept stopping and starting , on off Everytime my house called for heat. This went on for the entire year with them. The customer service people were rude and they refused to send in another tech guy, telling me they would charge me a service call. Dropped them and went to menan oil, turns out it was a defective part on the burner. Still have my inground tank three years later, no issues, stay away from their cheap oil for a better service oil company