
Copper pipe buying guide
Guide written on 6 February 2024 by:
Sebastian, self-taught DIY-er, Exeter
Important features
- Pipe or tubing
- Uses and installation
- Thickness and length
Copper pipe: uses and characteristics
Copper is widely used for domestic water supply lines as well as in heating systems to carry water to underfloor heating systems or central heating radiators powered by boilers.
Used for hot and cold water, copper is a resistant material with low thermal expansion. In fact it will only expand 6mm for every 25 metres compared to 6cm for PEX pipe and 7mm for multilayer pipe over the same length. It offers average acoustic insulation, but is extremely malleable.
Copper comes in two forms for plumbing applications:
Rigid copper pipe
Flexible copper tubing
Copper pipe and tube: features and uses
Copper pipe | Copper tubing | |
Uses and characteristics | Sold in solid pipe sections measuring 1 to 5 m | Sold in flexible coils measuring 2 to 50 m |
Exposed systems | Hidden systems | |
Usually requires heat to bend (using oxy-acetylene torch and pipe benders) | Can be bent cold (using pipe benders) | |
Pipe clips required for wall mounting | ||
Hot and cold water and gas distribution |
Tools for fitting copper pipe
Installing copper pipe requires skill and a range of plumbing tools including pipe benders and an oxy-acetylene torch. You will also need all the correct fittings to braze or solder the pipe (tees, elbows, reducers, straight connectors, etc.) and the right threaded brass fittings (e.g. nipples, reducers, etc.) to connect your sanitary appliances (water heaters, taps, etc.) to the water supply. Brazing or soldering copper requires a certain amount of skill and the right equipment.
Pipe benders
Common copper pipe sizes
Copper pipe size | Copper pipe application | Comment |
10mm | Central heating systems; in caravans and boats; feeding monobloc taps and radiators | Copper tubing known as microbore copper; more malleable than larger pipe |
12mm | Central heating systems | Not widely sold; more common in Europe |
15mm | Central heating systems; carrying hot and cold water; distributing gas. | Suitable for domestic and commercial applications |
22mm | Supplying hot and cold water to bathtubs, tanks, storage cisterns and boilers | Used to supply installations that need large volumes of water quickly |
Copper pipe sizes and usage
Copper pipe fittings
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Guide written by:
Sebastian, self-taught DIY-er, Exeter
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