If you’re new to copper pipe sizes it’s helpful to know that there are various standard options that crop up commonly for domestic projects. Let’s break down what you need to know.
How are copper pipes sized?
The size of a copper pipe is measured by its external diameter rather than the internal diameter. Typically in the UK, the most common size for a domestic project is 15mm for projects involving radiators and taps. For mains hot water feeds, the usual size is 22mm to allow for greater water flow. This size is also used where the pipe passes through a wall.
What are common pipe sizes?
To plan a plumbing or heating job, a company such as //watkinspowis.co.uk/products/copper-pipe-fittings-and-press-systems/ will look at the purpose of the pipe and work from there. For example, the standard 15mm copper pipe is ideal for kitchen sinks, standard wash basins, showers and central heating. The larger 22mm high-flow pipe will be ideal for a hot water cylinder, and an even bigger 28 mm pipe is used for mains water supplies.
Sometimes you’ll see imperial-size pipes on older properties. These are sized by their internal diameter, and it’s usually necessary to have a specific fitting to join an original copper pipe to a modern copper pipe as the diameter will be very slightly different.
What about copper grades?
Copper pipes are also categorised by their temper and thickness. They also have different join types. It’s important to understand the intended use of copper piping, together with its properties and any applicable regulatory standards beforehand.
