Hot Water Circulation Problem

Discussion in 'Home Repair' started by Platebanger, Feb 22, 2006.

  1. Platebanger

    Platebanger Guest

    Hi Folks, I run my hot water off off my oil fired boiler. I have plenty of
    heat but no hot water in the house. I suspect it's the circulation pump.

    What type of things can I check to determine or fix the problem ?

    Platebanger, Feb 22, 2006
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  2. Clarification please. Do you mean you have no domestic hot water but you
    have heat for the baseboard or radiators? If so, it is not the circulator
    as the house is not fed with a pump, just the heaters.

    If you mean the boiler is firing, but not circulating to the baseboard, then
    yes, it may be the pump. Do you hear a relay clicking as you turn the
    thermostat on and off?
    Edwin Pawlowski, Feb 22, 2006
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  3. Platebanger

    RBM Guest

    Assuming you have an indirect water maker, and not just a coil in the
    boiler: It will have an aquastat on it which is connected to a relay that
    turns on the circulator. Depending upon make and model, these things can be
    integral to the unit or placed on or near the boiler. Probably the easiest
    thing to do is turn the aquastat up, open the circulator wiring box and see
    if you have 120 volts on the circulator wires
    RBM, Feb 22, 2006
  4. Platebanger

    SQLit Guest

    Call someone who can see the installation.
    SQLit, Feb 22, 2006
  5. Platebanger

    Platebanger Guest

    Thanks, I have no domestic hot water but heat for the baseboard. The problem
    seemed to correct itself by turning the hot water temp to 130 but that was a
    couple of week ago and now I have the same problem.

    I tried draining the bottom of the water tank. I did notice some darker
    water but now it's running clear.

    Some info. It's a Super Stor Stainless Steel Indirect Fired Water Heater
    running from a Well McLain boiler.

    I ran some hot water in the sink for about 3 minutes and it was lukewarm but
    still not hot.

    Any suggestions ?

    Platebanger, Feb 22, 2006
  6. Platebanger

    RBM Guest

    If, when you turn the aquastat up and down, you Don't hear a relay clicking
    in and out: Unplug the black connector with the little wire attached to it
    on top of the unit, open it up and touch the two (low voltage) wires
    together. If that makes the relay click in, you have a bad aquastat in the
    RBM, Feb 22, 2006
  7. Platebanger

    Roy Starrin Guest

    As I read this, your boiler is heating one side of this
    heat-exchanger, and is either controlled by a zone valve or a circ
    pump. So this circ pump, if there is one, could be the problem if it
    has failed; similarly with the zone valve. The literature says it has
    a lifetime warranty; I would call them and talk to them. Certainly
    they can make some suggestions

    This page also has the installation manual, warranty info, etc.
    Again, there should be something there to help.
    In retrospect, if it needs to be replaced, and if the boiler has a
    tankless coil, consider simply using the output of that coil as the
    imput for a standard electric HWH, then connecting the output of the
    HWH as the input to the house HW.
    I did this years ago when the teen-age kids demand for HW exceeded the
    tankless coil's ability to produce it. In winter, boiler operations
    preheats the water. In summer, it simply flows through the boiler.
    Since I live in hurricane country, I had a cutt off installed to take
    the HWH back out of the loop if I want. My generator will supply 110
    to the boiler to produce HW for showers, while it will not produce
    sufficent 220 to use the HWH
    Roy Starrin, Feb 22, 2006
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