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does any one have any suggestions to what it might be I only noticed this today, but the funny thing is the one had this problem before I had the combi installed is better than all the others. The system had jet flo flushed etc and has a magna clean plus some other fancy liquid name to...

is this dangerous, after a recent install of a combi boiler and looking at the pipework, most of which is old, only the boiler has been installed and pipework directly adjacent, but under the floorboards I can see that the gas supply pipe is touching the flow pipe for central heating which...