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A boiler can be a closed system if you include the pipes it is connected to, but usually there are relief valves that will allow the escape of steam to protect against excess pressure and inlets that will allow adding liquid to the boiler to make up for fluid lost from the pressure valves. Also most boilers are imperfectly sealed so they leak a little bit.

If you do not consider the attached piping, then a boiler would not be considered a closed system since it would be constantly sending out steam and receiving condensate in return.

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12y ago

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