There is a proven way that all the professionals use in order to bend copper pipes successfully and accurately, that is to use a piece of kit called a pipe bender. The majority of pipe benders are made for a number of pipe diameters: the small ones usually are 8mm, 10mm, and 12mm pipe, whilst the larger bender is for 15mm and 22mm. Should you ever need to bend copper tube wider than this you either need to dedicate a considerable amount of time to increasing your strength or you should really buy a quite expensive powered bender, or just use fittings for the copper tube above 22mm instead. Radlett Plumbers use pipe-bending equipment.Microbore.Small benders are nearly always used for microbore copper tube. The pipe usually is supplied in a role and can often be bent by hand. However, in order to achieve a sharper, cleaner bend you will need a bending machine. The microbore is a pipe that is usually 8/10mm in size and is usually used in central heating systems with its main advantage being a very low heat loss as water passes through it. It is also very flexible and easy to run. Process:1). Make sure thatthe bender fully open so the arms are 180° to each other. Slide the copper tube between the arms, making sure it goes under the retaining arm and into the correct sized channel. A Radlett Plumber is experienced in pipe bending techniques.Bend the top so that it is parallel with the pipe, which the grooves have now covered. Start pulling the top arm down to start the bend. Pull the arms together in a single continuous movement until the correct angle is made. Release the tube by opening the arms. Another pie bender is available that can bend pipes of sizes, 15mm/22mm.