You do know it’s illegal to interfere with a gas appliance unless you are Gas Safe registered Ian? . Our system has a slight leak, last time the boiler went down the engineer did a test and said the boiler was fine but a slight leak on the system. Gave me this foam spray and said let the system cool totally, take out a bleed screw from a rad,.spray this stuff in for 30 seconds, takes 28 days to circulate and seal any leaks.
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Cheers. Rich…
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