You must ensure that your heating oil tank is installed in a location that complies with the necessary health and safety regulations. According to OFTEC, the tank should be located:
1.8m away from non-fire rated eaves of a building
1.8m away from any non-fire rated building or structure
1.8m away from doors, windows, or other openings in a fire-rated building or structure
1.8m away from oil-fired appliance flue terminals
760mm away from non-fire rated boundaries, such as wooden fences
600mm away from any trellis, foliage, or screen that is not part of the boundary