Is the flue also venting it far enough away? We had a new boiler installed and the plumber had to fit a telescopic flue kit (i think that is the name) as it didn't meet regulation.
When we moved house the first thing we did was service the boiler. The plumber should be able to answer these questions. Our boiler was "£$%ed, it hadn't been serviced in years, old, cheap, no pressure, leaked, cracked and didn't meet regulation.
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