Hi, I want to try adding Fernox leak sealer to my vented heating system. Would it be ok to use the Fernox F4 superconcentrate sealer via a radiator on a vented system.
Fernox F4 leak sealer.
- Thread starter gliderroos
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For what reason?
What are you trying to remedy?
What are you trying to remedy?
Oh and if you say to fix a leak I won't be amused lol 
Oh and if you say to fix a leak I won't be amused lol
Well since i started using the heating again there is some air getting in to the rads upstairs. So i just was thinking it might be due to a leak somewhere in pipework. I have checked the expansion tank in loft and all seems well. Now this Fernox F4 concentrate in the cartridge tube. It says ideal for for sealed heating systems, but not for single feed systems. So leaves me wondering would it be ok for my vented system ie not single feed or sealed system. Sort of a grey area in the information. Thanks for your reply
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It will not cure your air problem. Air in a system needs further investigation to find the cause.
But is it ok to add f4concentrate via radiator on a vented system anyway.
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Yes it should work on open vented systems just the same. But as above it's more than likley not the solution to your problem. You dont even know yet if its air being drawn into the system or Hydrogen gas being produced from within the system.
Also on a side not, If you have a Direct water cylinder (as opposed to indirect) you can not add chemicals to the system so be sure and check first (there not nearly as common as indirect but I wouldnt fancy washing my dishes or taking a shower in hot water contaminated with heating chemicals.
Also on a side not, If you have a Direct water cylinder (as opposed to indirect) you can not add chemicals to the system so be sure and check first (there not nearly as common as indirect but I wouldnt fancy washing my dishes or taking a shower in hot water contaminated with heating chemicals.
OK thanks very much for that. I have a divert valve and the cylinder is fed from a it's own tank in the loft. So a guess that is indirect right ?
Also has a coil inside and immersion going in the top.
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Yes, coil and seperate water tank means indirect so ok for chemicals in the CH system
Thanks very much for all your help.
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