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No its not illegal to use, which is why the boiler is only turned off by the controls but its not advised to use. The engineer should have installed it leaving a 1mb drop. He should have sorted that from the start. If you have a wall the a gas pipe can be run externally, then you can do...

Rest of case is fine and no signs of leaks. I guess flux was sitting on this for a few years

They work either on their side or straight down. Just fit an elbow to it if using it on the side