What is the minimum size of the drain pipe required on a low water cut-off with a separate float chamber?

The minimum size of the drain pipe required on a low water cut-off with a separate float chamber is 3/4 inch. This requirement is based on standard plumbing practices and the operational needs of the low water cut-off system, which is designed to prevent the boiler from running dry. A 3/4 inch drain pipe provides sufficient flow capacity to ensure that water can be adequately drained without causing any obstruction or backup, which could interfere with the proper functioning of the cut-off mechanism.

In the context of plumbing systems, using a pipe that is too small can lead to issues such as increased pressure, potential leaks, and inefficient draining, while a correctly sized drain ensures that any excess water is removed quickly and effectively. This specification helps maintain the safety and reliability of the boiler system by ensuring that the float chamber can accurately monitor water levels and react appropriately.