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hot water circulation

Will the hot water in a single zone system continue to circulate after the pump turns off? System is a copper ceiling installation.
The circulation would be the result of hot water rising and cool water falling.


  • Jamie Hall
    Jamie Hall Member Posts: 22,918
    It sure will. Not, perhaps, all that fast, but it will continue. There are many, many gravity hot water systems which did just that. The only thing that will stop it is a closed valve (a check valve may or may not).
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • kenhanu
    kenhanu Member Posts: 3
    Thank you. I thought that would help prevent possible freezing.
    Previous owner had repairs done. I have added insulation to
    reduce heat loss and protect pipes.
  • Gordy
    Gordy Member Posts: 9,546
    Is this ceiling radiant? Yes it will there should be flow control valves on the supply piping. The tubes are small diameter 3/8" so gravity will not be real aggressive, but it will flow.
  • kenhanu
    kenhanu Member Posts: 3
    comment. We lost power last winter in a 2 story home with a multi zone hot water baseboard system.
    I used a battery with an inverter and connected to operate everything but the pump and I had hot water.