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February 2, 2012 by admin Filed under Guest Articles on Low Cost Heating
How to drain down the central heating system in a home. Brought to you by www.ultimatehandyman.co.uk
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LOL, People will always need plumbers
Come on geezer! Making us plumbers lose out on the moular!
I’m just off out. Might be best if you ask in the forum, just follow the links from my channel page, they will advise you
@ultimatehandyman I have to move the radiator,the floor have taken up and there is no thermostatic valve,both of the two valve looking same.I’ve already turned on the heating to know which one is carrying the hot water but after opened up the valves there was both hot.any ideas?
The flow pipe normally has the thermostatic valve fitted to it.
Thanks for the coment
@ultimatehandyman the video was great.could you tell me how can I know which pipe is the hot flow and which one is the cooler return?
Do people complain so much about advertisements on the TV or in the newspapers!
Thanks for the comment
That is brilliant- well done
Gawd bless you! You gave me the confidence to drain her down and fit a new actuator motor; a job for which British gas would have charged me upwards of 200 quid. I did it for 30 quid with a part from ebay!
Thanks again buddy.
You can normally remove any air by bleeding the radiators during refilling.
Inhibitor should be added whilst re-filling.
Is draining down going to cause any complications with SEALED CH SYSTEMS? Anything I need to look out for when I’m refilling the system? I’ve heard of air pockets forming and all sorts.
@Kropotkinskaya Thanks so much. The most helpful plumber ever!
Yes, if you close the isolation valve and then press down on the ball valve in the tank no water should come out of it. If the isolating valve does not work you can stop the header tank from filling by placing a piece of wood across the top of the tank and then tie the ball valve up, which will prevent the tank from filling.
@ultimatehandyman wow. ok. makes total sense. Just hope that is indeed the isolating valve. If not, there’s always the trick with the ball valve right?
so you should not need to open a radiator bleed valve as air can get in via the header tank- which will allow all of the water to drain out. You only need to open an upstairs bleed valve if you have a sealed system!
Hi, No problem.
If the pipe going to the ball valve has a valve with a red handle, this sounds like a gate valve, so close that and it will stop the header tank from filling. When you connect the pipe to the drain off valve and open the drain off, the water will start to drain from the system and the header tank- continued-
@ultimatehandyman Firstly, thanks very much for such a swift reply. Secondly, is the isolating valve a red, circular, metallic wheel like thing on the header tank?
Lastly you say”you can safely open it and no water should come out”When you say it, are you talking about the drain valve downstairs or the upstairs bleed valves? If I bleed downstairs then upstairs level will drop?Sorry! Just want to avoid a mess!
Thanks for clarifying, and thanks again for you help. Really appreciated.
Once you have opened the drain valve downstairs and drained out some water it will be below the level of the upstairs bleed valve, so you can safely open it and no water should come out.
Hi Kropotkinskaya, you are not thick, you have the good sense to ask before you try something you have not done before
If you have a conventional system the header tank will be in the loft, it will be a tank with a ball valve in it. Some have an isolating valve and others do not. If there is no isolation valve you can tie the ball valve up using a piece of wood and string, this will stop the ball valve filling.
Hi ultimate handyman. 2 questions, and sorry to be thick.
Firstly, how can i isolate the water going into the header tank? Where will I find it (is it a switch or something on the tank itself?
And secondly, if I bleed the upstairs radiators first, won’t water come out? Or will openng the drain off valve of a downstairs radiator mean that that won’t happen?
Again, sorry for being thick – never done it before.
Thanks for any help
No problem at all.
Thanks for the comments!
Really appreciate your help. I’ll make sure that I won’t forget the inhibitor. Thank you very much.
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