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Are you making sure you are purging the system of air? When mine sits over the winter I have to make sure the first time I use it I fill the tank and go to every faucet and let the cold and then the hot run for a bit. That includes the inside and outside shower and even the hookups for washer if you have it. If I don't do that the water pump is very noisy. Quiets down tremendously with no air in the system.
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