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I am thinking about replacing a boiler for a fire suppression tank. The tank is a 200,000 gallon tank. Looking at the piping I assume the boiler heats a coil in the tank. My big concern is there is no coil. The piping has valve which do not close. I don't mind losing the water in a coil and replace the valve. I do not want 200k gallons of water on the floor.