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Domestic Hot Water Storage Tank

Tim_15
Tim_15 Member Posts: 8
I have a 500 gallon domestic hot water storage tank. The water is heated from a boiler that sends heated water through U-tube heat exchanger in the tank.I was wondering what should be temperature drop of the supply and return.Its only a 8 degree drop now.Does this mean the coil is fouled or the water flow is to great?
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