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Copper Pipes: All you need to know. Copper pipes are a popular choice in plumbing for their durability and resistance to corrosion. Copper pipe sizes are typically measured in mm, with the most common sizes being 8mm, 10mm, 15mm, 22mm, and 28mm. Knowing which size to use is essential for ensuring a safe and efficient plumbing system. • 8mm & 10mm: These smaller pipes are often used for central heating systems where flexibility is needed, such as in tight spaces or for connecting radiators. They’re ideal for short runs and individual radiators. • 15mm: The most commonly used copper pipe size in the UK, 15mm pipes are perfect for domestic water supply lines, providing water to bathrooms, kitchens, and other household outlets. They offer a good balance of flow rate and ease of installation. • 22mm: Used for hot water systems and main cold water feeds, 22mm pipes are better suited for situations where a higher water flow rate is required, such as in larger homes or for supplying multiple outlets simultaneously. • 28mm: This size is typically used in commercial settings or for long runs in domestic heating systems where a higher volume of water is needed. Choosing the correct copper pipe size is crucial for the efficiency and safety of your plumbing system. Whether you're planning a DIY project or need professional advice, understanding these sizes will help you make the best choice for your needs. For expert guidance or for installation services, feel free to contact us.