Flushing my system

[staningrimsby]

I had a plumber round the other day who replaced my heat exchanger and said it was full of silt, he suggested that the system is flushed.

I have an Arriston condensing boiler, what is the procedure for flushing the system, do i just buy a bottle of central heating cleaner poor it into a radiator then put the heating on for a bit to let it circulate before draining and re-filling.

Or does the central heating cleaner have to go straight into the boilers cw flow ???

 

[MUFC1999]

No a chemical will need adding to loosen all the iron oxide bulid up in you system, usually via header tank, radiator, filling loop, depending on set up, this ideally run around system for 7 - 10 days, then a flush machine needs connecting to your system, where you will flush the system in one direction and then the other, it is also good to put a chemical in while you are flushing, unless you dump alot then it would just be a waste, once the flush is complete more chemicals are added to help prevent future problems, also would be a great idea to fit a central htg filter at this point such as spirovent, fernox F1 or magnaclean, you cant just add a chemical run and drain that isnt a flush

 

[neds]

Will cost you up to £500 for a full power flush however if you don't want to pay that you can get decent results with a mains flush:

//www.diynot.com/wiki/plumbing:flushing_heating_systems

I've done it with good results. ?If you fancy it you could also take the rads off and flush them individually.

 

[MUFC1999]

If you have a good main that is, also cant reverse flow using mains, also uses alot of water, but can stll do a good job, good mains pressure usually better than that given by domestic powerflushing machine pump and can cost upto £700 depending on who does it, but remember you get what you pay for and for £700 i believe you get an excellent guarentee from some companys as for £200 flushes, keep your money

 

[qplumb2010]

i have a flushing board set up - where mains goes into either the flow or return depending which valve.

mains in
valve 1 attached to flow valve 2 attached to return
valve 1 open for flow valve 2 closed
valve 1 closed for return valve 2 open
i then have 2 other valves that divert to waste form each valve depending which way im flushing.
this way i can reverse flow
b it complicated to describe i'll sort a picture.

 

[heatingeng]

fitting a magnetic filter is a good idea.

The new magnabooster2 looks good and give a 20year warranty.
British gas have starting fitting them

http://www.youtube.com/watch?v=GjS_3ez1FPg

 

[hammerswinger]

i have a flushing board set up - where mains goes into either the flow or return depending which valve.

mains in
valve 1 attached to flow valve 2 attached to return
valve 1 open for flow valve 2 closed
valve 1 closed for return valve 2 open
i then have 2 other valves that divert to waste form each valve depending which way im flushing.
this way i can reverse flow
b it complicated to describe i'll sort a picture.

Yeah post up a picture please.