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29 October, 17:24

How many grades of fuel oil are normally considered as heating oils?

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  1. 29 October, 21:15
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    In the U. S., three grades of fuel oil used for heating are generally recognized. The grades are No. 1, No. 2, and No. 4. No. 1 heating oil is more highly refined than No. 2, and is less viscous. For this reason, it is more suitable for outdoor storage in very cold climates.
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