Central heating f4 leak sealer

[Readingplumber]

Something else on my mind -

We have been fixing leaks on sealed heating systems by using fernox f4 leak sealer, I was involved in an debate (friendly) that it might stop the leak temporarily but after about a year, or if the system gets emptied that the leak sealer what ever it does will not work anymore ie just consider it a medium term fix as theres no short cut to finding the leak.

Other plumbers say it will be a permanent fix.

Any opinions?

Thanks again

Readingplumber

 

[tamz]

Temporary fix. 1 -2 years then needs redone.

 

[AWheating]

and it does void warranty conditions with some manufacturers. best to find the leak and fix it properly imo.

 

[gassafe]

It fixed a pressure drop for me recently! It lasted about 24 hours then it started to leak again! I think the leak was too big for it to be honest!

After taking up the laminate & floorboards beneath managed to find a leaking plastic push fit isolation valve!

So I don't rate the leak sealers much, plus I have seen if vents completely filled with jelly like substance after leak sealer added! So much for "does not block air vents"

 

[Fishpond]

Always better to look for the leak. I don't use leak sealer at all... can cause other issues clogging up the system and not worth the hassle.

 

[shaunsinky]

i only use it if the sealed system is losing pressure over 3-4 months making the leak impossible to find, ive never had to add any more later on though

 

[Destroyer2813]

As AW said can void warrentys on new boiler due to the small passage ways on the new heat exchangers

 

[lame plumber]

wont worry an intergas boiler then, used leak sealer on pinhole leaks in buried pipe, saved digging the floor up for the timebeing.