central heating flush

davsidipp

hi.need to flush c/h system as it bangs seems tobe coming from around boikler area..
also want to put in auto air bleed.not sure whitch types flusher or vent to use. any help appreciated.

roger196

First I would try Sentinel x400 sludge remover www.screwfix.com part no 89458. If this did not improve matters, try Sentinel X200 Boiler Descaler part no 43140.
Another way is to manually clean the rads if they are blocked. The symptom of this is hot at the top and cold at the bottom. The sludge forms an inverted V in the rad. The cheapest way of removing this is to take rad off wall(drain system, turn off valves each end, use plenty of rag to catch black sludge), into garden and flush through with garden hose. repeat with remaining rads.
Another way is to remove one rad. Attach garden hose to each of the pipes, plastic hose when warm will just slip over 15mm pipe, fix with jubillee clip. One hose to garden tap, other hose to drain. Then flush each rad in turn with others turned off. Use lowest water pressure possible to get flow through as full mains water pressure can damage valves etc.
Once system is clean, there should not be a build up of air, hence no need to fit auto air bleed.

keystone

How did you determine that a banging noise from near the boiler means that the system needs flushing? Thats a bit like deciding that the fuel system in the car needs a good cleaning out because the offside front wheel is squeaking! Well not exactly but I hope you get my drift.

Cheers

gas4you

If it does need flushing I would recommend X800. Stronger and faster.

If your boiler has an aluminimum heat exchanger don't leave it in for more than 3 hours max.

davsidipp

hi.i have had several c/h people in and thats what they recommend they would thou at £250+..they never looked at anything else.this must be the new money maker same as having your drains pressure hosed.

plumb1_2

davsidipp wrote: »

hi.i have had several c/h people in and thats what they recommend they would thou at £250+..they never looked at anything else.this must be the new money maker same as having your drains pressure hosed.

Did they explain why it was banging???? Imo lack of water in the system air lock etc.. But why has it got a air lock???? You need to have a water test of the heating.
Powerflushing wont cure the problem if it has been piped up incorrectly, by-pass valve closed or incorectly set could make it pump over, adding more oxygen to the water=sludge build-up.

There are many types of banging etc, you need a good plumber/heating guy with experiance. I do many powerflush's but it is not the cure-all, i can spend 5+hrs flushing then another 5hrs correcting the problem.

davsidipp

hi,plumb1.no they did not tell me anything,test anything.just straight away stated needs power flushing.i would like there to be someone who for a small test and give a quote for whats wrong.because it could be flushed and that not be the reason.would a service find the fault(s).thanks ps what is the going rate for a service