I want to drain the upper floor radiators in my house so as to replace and resite a bathroom radiator. The heating is a fully vented system 24 years old with F&E tank system. There are no drain off valves on the rads. There is a drain however on a 15mm pipe that enters the boiler next to what appears to be the hot water feed to the storage tank. I assume this 15mm pipe is the direct cold feed from the F&E tank?
If I open this valve and lead away the water through a hose connection having first interrupted and secured the F&E supply I assume this will drain down all the central heating system if I open the all rad air vents ? I don't need to drain all the rads surely so should I secure all the rads valves except for the one rad to be changed? Is my logic correct and how do I know when I have drained down just the top half of the house heating?
Am I risking damage to the 24 years old other radiators by draining down ? The pipes and rads have not been touched before this time.
Any help gratefully received for DIY first project!
hi dougie simply drain all the system and add inhibitor when refilling use a good make ie,sentinel fernox etc there is no advantage in part draining however on a 24 year old system it may be time to consider new rads especialy if black sludge is found , all the best john
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