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Fuel heaters for diesel are required in very cold climates, for below -20 degree operation. Even in Alaska when they run pure Kerosene, the fuel can gel below -40 or -50. If you are heating biodiesel you can still install the heater in the heater coolant circuit, but vegetable oil will need heat all the time, at least to get through the filters.
And I can't imagine a fuel heater on all the time would affect how the regular diesel fuel burns. As soon as fuel gets into the injection pump it heats to engine temperature.
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