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Discuss Unvented system and expansion tank pressurisation in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

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It was a BG engineer (Homecare) who called at 4pm on a Friday and he was very eager to get the job done quickly to start the weekend (It was the euros footie weekend). Perhaps that's why the pressure wasn't checked??
 
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This is the correct way AFAIK, I have seen these in a few places on the continent with NO expansion vessel, the expansion valve releases the expansion volume each time the cylinder heats up, don't know if this met local regulations or not even though a expansion vessel should not be considered a safety feature as it can fail at any time and fill with water.

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