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I want to know if there is any benefit to be had by pre-warming oil before it gets pumped to my burner. The oil tank is outside and the oil is very cold,(it is really cold here in the winter) Also, I have a source of warm waste water and I could easily route the oil line to the furnace through a coil immersed in the warm waste water, on it's way to the burner. If this is an economical benefit , I would like to know what efficiencies could be expected.