Power flushing can of worms

[tommy1712]

Gunna open a bit of a can of worms hear, do u or do u not flush the boilers? Combi, conventional, back? Reasons as to y u don't if u don't please. I am relatively new to flushing and I am getting a lot of conflicting answers. Also I have been cracking on with fx2 and a neutraliser with good results so far but some say not to use it. Any advice welcomed

 

[gasmanrob]

Don't use fx2 on ally so pretty much anything fitted in the last 12 years.

if it can be avoided try not to flush back boilers there's a plastic spreader inside the return and you run the risk of either blocking it or blowing it.

microbore incorporating a manifold do so at your peril.

if your going to flush a combi get a pump adaptor and do it from there but remember you'll need to be gas registered to open her up, and also remember to close any AAV incorporated within the boiler.

 

[tommy1712]

What chemicals do u recommend? Some people only use fx2 on everything some never flush the boiler some always do some do it hot some do cold lol

 

[gasmanrob]

I like kamco chemicals but they are aggressive and if you don't neutralise they become gasey. Hyper flush is ok for ally I believe.

I tended to use sentinel chemicals as they were always readily available worked well and didn't give any issues if a little remained in the system.

and always flush hot, it activates the chemical and makes it easier to see where you have succeeded and where you need to focus some attention

 

[DorienBrum]

Good to remember that water in central heating system is contaminated with rust, sludge and other debris because of internal corrosion. This corrosion products are causing circulation and boiler noise problems, premature failures of heating system components and reducing system efficiency (increasing your fuel bills). System needs to be flushed and cleaned and the best solution is powerflush. Using the right chemical is crucial, to removing it.

 

[gassafe]

if it can be avoided try not to flush back boilers there's a plastic spreader inside the return and you run the risk of either blocking it or blowing it

First iv ever heard about a spreader in a back boiler or any heat exchanger, although I normally just flush an old boiler before fitting a new one so maybe I have damaged em lol! Iv got an old back boiler in the scrap heap, I might break her open to look at this spreader...

 

[gasmanrob]

Well this is a revival that'll keep going for a while.

The spreader looks like this



they weren't fitted on all systems came as part of an injection tee

 

[gassafe]

Ah thanks, I have read about the injection tee's on them, isn't that to do with gravity water & pumped heating return?

So there is no plastic bits inside the main cast iron hex I guess!?

 

[gasmanrob]

Yeah the injection tee provides a path over the gravity end of the tee to prevent back flow or stoppage of gravity circuit.

The spreader was to stop cold water being forced onto a single point of a very hot heat exchanger and extend its life.

But over the years most were left in when systems were upgraded to fully pumped so you could unknowingly cause issues should you come up against one