The Three Types of Heating Oil
By Renee Serlin
There are three main grades of heating oil, called No. 2, No. 4, and No. 6.
The first is the cleanest and most expensive; the last is the dirtiest and cheapest; and No. 4 is a mixture of the two. Unless you're installing a new boiler, you don’t get to choose which oil you use; your boiler and burner will be manufactured to burn one. No. 6 is heavy, sluggish and dirty.
Craig Rosenman of New York City's Stuyvesant Oil estimates that No. 6 is about 40 percent less expensive than No. 2 and provides more heat per gallon than any other grade. The downside is that, because it is very dirty, the equipment using it requires more costly maintenance.
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