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indirect water heater in summer

shersam Member Posts: 1
1886 house in upstate NY. Hot water radiators in big old house.

Weil McLain boiler installed in 2002. Last year the water heater tank went and when we went to replace it, plumbers couldn't since the chimney not lined and it would violate code. So we got an indirect water heater which works well, but in the summer months I notice that some of the radiators are warm, some more so than others. Isn't there a way to prevent the water from circulating thru the house? I just want to heat water, not the radiators.


  • Canucker
    Canucker Member Posts: 722
    You need some check valves, you're getting ghost flow from the hot water. It may or may not be easy to do, depends on the piping arrangement
    You can have it good, fast or cheap. Pick two
  • flat_twin
    flat_twin Member Posts: 353
    You should call the people that installed the indirect water heater. No, the radiators shouldn't get warm while domestic hot water is being produced. If it was my house I'd say the flow check was broken or missing from the space heating circulator but I don't know enough about your particular piping layout.
  • Ironman
    Ironman Member Posts: 7,400
    Or, it has flow check(s) and they're leaking by.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Steamhead
    Steamhead Member Posts: 17,012
    Take some pics of the piping and post them here- let's have a look.
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