Central heating leak sealers?

[xr4x4]

hello,

i have a sealed central heating system that is loosing pressure over a period of about a month. 1 bar to zero.

if i cant find a obvious leak, do these central heating system sealing products work?

http://www.buyplumbingonline.co.uk/products/Fernox-F4-express-central-heating-leak-sealer-265ml.html

if so permanently?

the pipes look an overall good condition.

thanks in advance.

 

[MickyP10]

Erm, maybe...

Tried them a couple of times and with the first instance it slowed it down, with the second it stopped it for a couple of weeks. Really depends on the size and type of leak. I'd say try it. Worth a shot.

 

[xr4x4]

as i said, it must be a tiny leak, so was just a thought.

anyone else tried them?

 

[muggles]

Have you checked the pressure relief outside isn't dripping? I don't like leak sealers in sealed systems, always that slight concern that they may seal up the pressure relief valve, leaving nowhere for excess pressure to vent to

 

[transam]

What type of boiler have u got ??? cast iron , condenser ??

 

[xr4x4]

was going to check the PRV.

its an old oil boiler, so cast iron i guess.

 

[transam]

was going to check the PRV.

its an old oil boiler, so cast iron i guess.

Most likely steel ?? leak sealers I have used them with success on several occasions , fernox or sentinel How ever !! I ended up blocking or restricting the heat exc on a condensing boiler ounce

hence the question on boiler type , I assume it is not an oil condenser ??

there is risk but with an old fashioned ? type of boiler the risk would be pretty minimal , I would probably use it if there was no easy option for finding & effecting a repair ( leak ) do what it says on the tin , stick to either sentinel or fernox , stay away from cheap products from ?? who ever , hope it go's well !

 

[xr4x4]

nah, not condensing, its very old..!!

as its such a small leak, i reckon its going to be hard to find.

i will try it and see what happeneds.

thanks.