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Frozen Oil lines???????????????
Home heating oil will gel at very cold temperatures, but before that happens, wax crystals begin to form, and will clog filters. Any water/sludge in the tank bottom will freeze solid. The temperature at which the wax crystals begin to form is called the "cloud point", and varies from load to load. Pour point isn't usually something that home systems need to be concerned about, but it refers to the point at which the oil is liquid enough to pour. Some commercial fuel oils need to be heated to 100 degress before they are liquid. Reputable oil companies will add a pour point depressant chemical to their product as a routine measure, especially in very cold areas. Others have mentioned field remedies to help thaw out above. Best solution is an indoor tank, Roth is one manufacturer. ALL fuel oil contains water in some amount, so monitoring the amount in the bottom of the tank is important. A biocide will keep the algae that grow on the interface between the oil and the water under control; any reputable oil company will add this to their product as well. I hope you found this useful.