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Heavy fuel oils require heated tanks to facilitate their transportation and processing. This paper proposes and investigates three-and four-level heating coil bundles. Numerical study revealed that powerful large-scale circulation of the heated fluid enhances heat transfer, delivering 16.7％ and 23％ improvements to the average heat transfer coefficient for the three- and four-level bundles, respectively. Furthermore, this circulation improves oil mixing and limits the variation in bulk oil temperature to?0.3 to+1.3 °C from the average. The study also quantified oil flow velocity near the bottom of the tank. The time-averaged horizontal components of velocity, estimated 25 mm and 50 mm above the bottom of the tank, exceed 2 mm/s and 4 mm/s, respectively. The proposed heating coil bundles feature a compact design that reduces the material and labor costs of construction and that, by occupying only a small portion of the bottom of the tank, improves accessibility, maintenance, and cleaning.