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Discuss No flush before new boiler in the Central Heating Forum area at PlumbersForums.net

Messages
4
Hi all,

Homeowner here and would be really grateful of any feedback. I've had a new combi boiler installed into a 25y/o house yesterday.

Now the boilers intermittently v loud and intermittently not giving hot for a little while. Signs it seems (tho not a professional) of the system being dirty and clogging the heat exchange / pump of our brand spanking new boiler?

The water's also v black on the radiators.

The installer has said they only did a "system flush" and want to sell me an additional power flush.

Would you guys consider this unreasonable or do I need to bite the bullet for being naive and not delving into fine print?
 

Knappers

Plumber
Gas Engineer
Messages
592
For me on an install I usually advise a powerflush but unless there is a clear issue I would likely just do a chemical flush.
Just draining system does not constitute a system flush.
Check your benchmark certificate in back of manual and see what system cleaner is listed, if none is listed (or not filled in) then I'd say you've got a good case against installer if the installation instructions state that system MUST be flushed.

Did they install a magnetic filter in the system?
 
Messages
4
Hi scott_d the quote included "system flush" and included a magnetic filter (which is fitted)

*edit Thanks Knappers. I've got the boiler manual with details about flue type and gas pressure etc. but not a benchmark certificate - should there always be one of these?
 

Knappers

Plumber
Gas Engineer
Messages
592
The best job would include testing the water or include a powerflush anyway. For me with a straight swap its not practical as quotes would always come out too expensive and I'd not get any work.
 

Knappers

Plumber
Gas Engineer
Messages
592
Hi scott_d the quote included "system flush" and included a magnetic filter (which is fitted)

*edit Thanks Knappers. I've got the boiler manual with details about flue type and gas pressure etc. but not a benchmark certificate - should there always be one of these?
In back of installation manual (usually last page)
 
Messages
4
In back of installation manual (usually last page)
Cheers found it - says

"Yes"
brand is blank
product "x800"
and inhibitor "x300"

Rads were only hot for about 30 mins until they finished and not all valves were turned to on.

Could they have actually done a proper job but I should've specified a more in depth clean?
 

SJB060685

Plumber
Messages
2,017
If the system water is black that is a serious sign of system fouling. A cold flush probably won't be enough and a powerflush would be advised.
 

Knappers

Plumber
Gas Engineer
Messages
592
If they did a flush and fitted a filter and it's blocked up anyway then it may just be that it really needed a powerflush.
Expect £400-£500 and take solice in the fact that the guy that would have tested water and flushed automatically would likely have cost extra £800 on original install.
 

SJB060685

Plumber
Messages
2,017
Cheers all. Looks like I just need to dig into my pockets (I've short arms!)

The installing engineer should have taken this into consideration. Magnetite or iron oxide appear because of a couple reasons.
Was the system originally open vented? Did you have air problems prior to the swap
 

Knappers

Plumber
Gas Engineer
Messages
592
X800 is a good flushing chemical, no way to know if any mistakes were made.
Sometimes it's just one of those things.
If it were my install then I'd probably give a favorable quote for the powerflush.
 

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