Gas furnace readings

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by pedietz, Nov 22, 2006.

  1. pedietz

    pedietz New Member

    Nov 14, 2006
    I have a Weil-McLain boiler supplying the hot water to my cast-iron radiator heating system. Any one have a thought on what the pressure and temperature gauges should be reading? The temp gauge goes to 130-140F after the boiler cycles off, and the pressure gauge appears to be fairly steady at +/-20 lbs. Should the pump that circulates the hot water be running when the furnace is no longer burning?
  2. Gencon

    Gencon Renovator

    Nov 16, 2006
    Etobicoke, Canada
    First off, you have a boiler, not a furnace. But, the readings appear to be just fine.The recirc pump will continue to run after the burner stops firing because it is either on a timer or a temperature control.This is a great feature for a hot water system because it will continue to provide heat to the house long after the burner has shut off.It increases the efficiency of the system by using all the heat thats available.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    The temperature could be proper, low, or high, depending on what media you use in the rooms for heating. The pressure is correct. Depending on how the system is wired, the pump could run until the thermostat is satisfied regardless of the boiler's temperature.
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