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Hello All, Just wanted to get some feedback on a system design I came up with. I understand that in a vented system the water in the tank should remain below 20 degrees to prevent legionella but it never made sense why you would route the hot water vent pipe back into the tank. I took...

Hi, Just bought a new copper cylinder and looking inside, the central heating coil is rippled. From what I understand ripples are bad and can result in erosion over time. Since I want this cylinder to last 20 years would it be better to return it? Am I making something out of nothing? Thanks...