How and Why to Flush Your Heating - Easy DIY

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How and why to flush your central heating system for DIYERs.

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#plumbing
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#centralheating

[davidreeman]

Very informative and practical, thank you.
Nice to see a young chap protecting his hearing! You don’t want to suffer when you are older like I do.

[vmankay]

Get a £20 massage gun with the foam ball end and use that to vibrate the radiator, cheap alternative if you don't have an SDS or the attachment is too expensive.

Although Iv done this job before i thought id ask the service engineer for a price for him to do it as I couldn’t be bothered but after a straight up quote of £200 I instantly decided to stop being lazy and I’m doing it myself at the week 👍 thankyou for the video mate.

[delboypass]

Nice zoned system .. looks great.. better than most plumbers install
Good video!!

[joncole]

Thank you for taking the time to make and share this video! 😊

[tomroguk]

Appreciated the explanation of the different cleaning products.

[highsky]

Just realised from one of your comments that you're not in the trades and just a DIYer! Probably the most knowledgeable DIYer I've seen!! I have a few questions which may seem silly, so when you initially drain the system before adding x800 can you drain from any radiator? Would it be better to drain from one downstairs? And when it comes to flushing are you draining every radiator individually while the mains water is running and then moving to the next or is the draining occurring at only 1 radiator while you open each radiator one by one?

[ncooty]

@4:40: Magnacunz? What is the word you're saying? Great if you could add a link in the description.

[CH-ener]

A brilliant video, helped me a lot. Could you do a video explaining how different central heating systems work ?

[kunal-gc]

This is brilliant, thank you for taking the time to show it. I had a question if I may please. I recently had done exactly what you did in terms if flushing the system. We also replaced a 3 radiators. However, once the system was refilled, the boiler has now started making a loud banging/juddering noise. All the radiators were bled but the noise is still there. We bled the boiler pump but that did not help. We change the automated air vent in the boiler thinking that may have been faulty. However, that did not help either. Some have said it could be the heat exchanger but I am sceptical because the boiler was absolutely fine before the work to flush the system out was done. I am at a loss. I saw in your video that at the begging you turn all the motorised valves to manual. I don't think we did that. I'm not sure if that is why but really struggling. Could it be the expansion vessel in the boiler where it may have lost its charge whilst draining? Any thoughts would be most welcome?

[jakebarnes]

At 8:22 you talk about flushing both the flow and return as opposed to just one- is there anywhere else I can find information about this? Does this only apply to the radiator which is being used to drain down the system? This is the only bit I'm unsure about in your otherwise very informative and helpful video.

I'm dealing with a very clogged up central heating system so I want to get it cleaned up as well as possible and this seems rather relevant to flushing as effectively as possible, if you could extrapolate on this I would appreciate it- I've not seen this mentioned anywhere else. Thanks.

[TelstarTAK]

Thanks for an informative video. When you've treated with X800 for an hour on full heat, we have a drain point at one of the radiators. Should we just drain the whole system and then refill the whole system? Not sure how to 'blast' one radiator at a time - what is the sequence exactly - are you sending refill water to one radiator at a time, then draining system each time and closing off to do the next radiator, before finally refilling the whole system?

[shadowdugify]

Really like this idea, I was thinking of getting one of the drain cocks open all the time and flushing the water through. Would I still need to turn off the thermostat and lock on each radiator in turn, I pressume to keep pressure up in that single radiator to remove the gunk?

[dejanmyrtaj]

I wanted to ask if it is easy or difficult to install central heating as a beginner who has finished the 4 month school for hvac systems, where should we base ourselves

[kpatel]

Thank you for sharing this video I appreciate your time 🙏🏻

[robevans]

Hello, could I get a bit of advice? Green star junior with 8 rads.

I have a kettling issue on the hotwater. Used fernox f3 and left it in for around four days with the boiler on for around an hour each day. Any more would make the house too hot at this time of year. I have concrete ground floor so the rads come down from above with two drain off valves. Hooked them up to hose pipes and let one drain off. One first then the other, then both. After a while, i opened the boiler mains filling loop to flush and then opened the bleed nipples to assist flow. . Did this for around an hour.

However, i didn't close the valves on the rad next to the drain off valves, so may have only flushed the return???? TBH all I really wanted was to remove the fernox to prevent any future issues, not do a great job of flushing. If some fernox f3 residue remains, it won't do any long term damage?

I have refilled, removed the air and turned the boiler on for half an hour. All rads heat up and seem hotter than before.

Should i do it again, this time with the Lockshield closed by the drain off valves? Or can i just put some fernox inhibitor and noise reducer in and hope the kettling is sorted before getting a plumber in?

[aligooya]

Thanks, that is very informative; what spanner are you using? It seems a decent tool that makes an easy job of doing nuts.

[ThePaulg]

So in general this is a fairly safe DIY method for someone to do at home?

[highsky]

Could this possibly help if there is a blockage in the heat exchanger?

[CAR_SOLUTIONS]

I’ve got a combi boiler is the process the same by leaving the filler loop on and letting it get full whilst draining it? Do both lock-shield and trv need to be off or just the trv will be sufficient? Do you use just a normal drain off point for the water to just come out? I’ve only got one drain off point on a 15mm copper pipe by the front door will that work?