====== DRAINING A CH SYSTEM ======
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[b] Sealed System [/b]\\
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 First thing to do is to switch off the boiler, \\
and locate a drain off point normally found at the lowest point in the system under a radiator. Attach a hose to the drain off (good idea to secure hose with a jubilee clip and have a roller tray to catch any drips) and then open valve with an adjustable spanner.\\
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[img]http://www.screwfix.com/sfd/i/cat/90/p1050790_l.jpg[/img]\\
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[b]Radiator valve with a drain off point.[/b]\\
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You will need to allow air in to aid draining so you should undo a bleed valve a little on an upstairs radiator. When water has stopped you can work on the system.\\
 Refill the system [[plumbing:faq:faq6|see faq 6]] and add / top up inhibitor [[plumbing:faq:faq28|see faq 28]]\\
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Bleed radiators starting with the ground floor ones first [[plumbing:faq:faq16|see faq 16]]\\
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[b] Vented System [/b]\\
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As above but firstly you should tie up the ball valve to a plank of wood placed across the cistern to cut off the water supply. To refill, simply untie the ball valve. Don't forget to add inhibitor and bleed rads.\\
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[b] Please note that each drain off point only drains that particular "zone" of pipework so you should check for other drain off points for a complete drain down [/b]\\