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Noisey Hot water tank

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Fishinfred
Fishinfred Posts: 1
in Radiant Heating

I installed a 30-gallon electric hot water tank to use as a backup if the propane boiler fails. The electric tank whines when it is calling one or both zones call for heat. I have installed a relay to handle the load of the two elements working together. The original T-stat controls the relay. The system has water in it now as I lost the antifreeze when a gasket failed and want to flush the system before adding antifreeze. I know the elements are the cause of the noise but am not sure how to stop the noise. I would appreciate help with this issue.

Thanks

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