Radiators leaking.

"Inhibitor" is to inhibit corrosion - not leaks. You need a leak sealer fluid to seal leaks. Worth a try, perhaps.

JK

It sounds as though you are on a mission to replace all of the CH radiators. If one fails then the likelihood is that the radiator has rusted from the inside - because no-one put inhibitor in. All radiators are likely to be similarly affected. It's like tyres on your car, when one is down to the limit it invariably requires multiple tyres to be replaced (though of course front and back might wear at different rates).

In my view trying to fix this using some sort of leak sealant would be similar to applying elastoplast to a broken leg.

Andrew

I would bet that it is taking in oxygen or fresh water somehow, i.e., pumping over, a leak, F&E tank incorrectly set up.

Is it a sealed system or has it got a F&E tank? You need to find & rectify the cause and flush the corrosion products out the system.

Thanks for the replies.

It does have an expansion tank which I now fear may be the problem.

We have an amazingly small attic which means that, even though it is very close to the rafters, it is probably too low, or so I've been told. It is kept covered but there seems to be some condensation; would this lead to it taking in the oxygen/fresh water?

Is it possible then that the condensation is rising up, hitting the rafters, and getting back into the tank somehow, and if so what would my alternatives be on moving the tank, bearing in mind the limitations of space i.e. does it have to be high, does it have to be up so high etc.

Also, please explain "pumping over" as it sounds like a (hopefully) less expensive possibility.

Thanks again. George