Which type of copper pipe is the heaviest and thickest?

Type K copper pipe is indeed the heaviest and thickest among the different types of copper pipes available. This classification system is based on the wall thickness and intended applications of the pipes. Type K has the thickest walls, which makes it suitable for applications that require high durability and strength, such as underground and high-pressure installations.

The thicker walls of Type K pipes provide better resistance to external pressures and corrosion, making it the most robust option for plumbing and heating systems, especially in contexts where durability is paramount.

Other types, such as Type L and Type M, have thinner walls and are intended for less demanding applications, with Type L being a middle option suitable for general distribution lines and Type M being commonly used for residential plumbing. Thus, the distinctive thickness of Type K is what makes it the heaviest and most durable choice among the copper pipe varieties.