What is the minimum diameter size of a fuel oil supply line?

The minimum diameter size of a fuel oil supply line being 3/8 inch indicates a standardized requirement that ensures adequate fuel flow without risk of pressure loss or clogging. This diameter is typically sufficient to support the demands of heating systems that utilize fuel oil, balancing the need for both efficiency and reliability in fuel delivery.

Using a fuel oil supply line with this diameter helps maintain the proper flow rate necessary for optimal burner operation, thus enhancing the overall efficiency of the heating system. A supply line that is too small could lead to restrictions, causing inadequate fuel delivery. On the other hand, larger diameters might not be necessary for most residential applications and could lead to increased costs and complications in installation.

The mention of other sizes illustrates that they do not meet the requirements for effective fuel delivery. For instance, 1/4 inch may not provide sufficient flow, while 1/2 inch and options that lack suitability in terms of standard practices wouldn't comply with codes or industry norms. 3/4 inch, although acceptable in certain applications, exceeds the minimum requirement typically needed for standard residential oil supply lines.