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cast iron baseboard warm when heat not called for

burnerman_2 Member Posts: 297
if it was just installed b sure they put in a flow check i have seen a few the installers for gotb if its a coldstart it will b okay but not if the boiler maintains temp royboyf


  • Kyru
    Kyru Member Posts: 1

    I have installed recently a new oil fired boiler and indirect hot water storage - the system is 2 zones plus the indirect hot water storage - Baseboard in one zone (1 story house with 2 heating zones on the 1st floor)gets warm when the the natural room temperature is well above what the thermostat is set for. I have not had to use the heat yet this season yet the baseboard in the one zone is getting warm - the boiler does not go on except when needed for the domestic hot water (indirect hot water storage tank with coil on its own zone with circulator) - I recently changed both heating zone room thermostats but this made no difference - any thoughts on why this may be occurring
  • Timco
    Timco Member Posts: 3,040

    sounds like thermal migration. with pics of the near boiler piping, suggestions can be made for how to make changes in piping to fix this.

    Just a guy running some pipes.
  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
    Does this system

    use 2 zone valves and just one circulator (pump) for the baseboards, or 2 separate circulators?

    If the former, a ZV might not be closing properly.

    If the latter, a flow-check might not be closing tightly.

    If you're not sure, call a pro. Try the Find a Professional page of this site, under "Resources" above.

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
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