Which jointing method is recommended for making cold pipework connections close to a plastic cold water storage cistern?

Using compression joints for making cold pipework connections close to a plastic cold water storage cistern is recommended for several reasons. Compression fittings consist of a nut and a ring that, when tightened, create a seal without the need for heat. This is particularly important when working near plastic components.

Plastic cisterns can be sensitive to heat; using soldering methods would pose a risk of damaging the cistern due to high temperatures. Threaded joints can also introduce the potential for over-tightening, which might crack or compromise the plastic structure. Push-fit connections are commonly used in various applications, but they are not always ideal for situations where a mechanical seal is preferred or where the pipework may experience movement.

Compression fittings allow for reliable and adjustable connections, making them an optimal choice when working in close proximity to plastic materials that could be adversely affected by heat or excessive torque.