should already have one. Look under boiler for 2 chrome taps-one on the cold main and one on the flow or return pipe from the boiler-the loop consists of a flexible connection that you put between these taps to fill the system. Fill the system to the recommended pressure-usally 1-1.25 bar but check with manufacturers instructions. Then switch off loop and remove-Some boilers have an in built loop-check instructions if this boiler is one of these-in all cases be careful and if in doubt- do nowt!
gb, July 2010
