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You'd probably want to add some more depending on how much water you have to empty out of the system when you change the rad. I wouldn't assume that the job was done properly in the first place and the fittings might have just been cheap enough to suffer from this kind of failure. Would be typical for new builds to price things like towel rails down to the minimum.
Airhead
mustardbeak
I have a new build flat less than two years old. The towel rail in the bathroom has sprung a small leak around a patch of rust on a join, but on closer inspection it has several small rust marks all over it.
I am going to replace it, but I wonder if a lack of inhibiter in the system would cause it to rust through? Is there any harm in me putting another bottle of the stuff in when I change the rail?