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I have what seems like a plumbing issue with my hot water. When i first turn on the hot water, whether from a sink or the shower, it can take up to 30-45 seconds for the water to get hot. If I then turn on any faucet or shower a few minutes later, the water gets hot in reasonable time, but if I comeback an hour later it would take 30-45 seconds again. Can this be a problem with the water heater? Is there anything I can do? I am wasting a great deal of water waiting for it to get hot and would love to be more efficient. any suggestions?