Tanman
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I understand that as a DIYer that I'm not allowed to work on an unvented cylinder but am I allowed to replace the pressure regulator (3.5 bar) that controls the cold water feed to the cylinder? It is starting to leak and hot water pressure has been dropping over the last couple of weeks. This seems the most likely culprit.
To be 100% accurate, hot water pressure is initially good, then drops off after 2 - 3 seconds but then after 7 - 8 seconds does recover a bit.
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