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Thread: Aquastat settings

  1. #1
    DIY Junior Member tedlaw's Avatar
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    Default Aquastat settings

    I have a series 2 B, Burnham Boiler. My water pressure gauge shows 15 psa. My water temp. will not go above
    140F. The dial on the Honeywell aquastat attached to the boiler is at 230 @ the 12 oclock indicator.
    Should I move that higher to attain an uper limit of 175 or so?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    The boiler may only go higher if there is a call for heat...the thermostat may not be asking for heat, or the controller is not recognizing it. 230-degrees is likely way too high - to operate there, the system pressure would likely need to be higher to be on the safe side...if there were ever a leak, 230-degree water flashing to steam will ruin your day if you're still around and alive to see it.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Member Soapm's Avatar
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    Not to thread jack but I'm curious, what makes their boiler stay below 140 unless there is demand? That seems like a smart, energy saving idea. Is it possible to make our boiler do this?

    We have a natural gas Hydrotherm R250C with a Honeywell L8148E controller.

  4. #4
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by Soapm View Post
    Not to thread jack but I'm curious, what makes their boiler stay below 140 unless there is demand? That seems like a smart, energy saving idea. Is it possible to make our boiler do this?

    We have a natural gas Hydrotherm R250C with a Honeywell L8148E controller.

    I am no pro on the subject.

    I do know that it is not good too go tweaking on the controller, unless you have the proper instruments and know how.


    Once you jack around with the control, It can be hard getting it back to factory recommended settings.


    Have Fun.
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  5. #5
    In the Trades Tom Sawyer's Avatar
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    The L8148 is a single high limit aquastat that shuts the boiler off at a set high temperature, usually 180 to 200 degrees. It has a built in 15 degree differential so the burner will come back on on a 15 degree drop. There are no other adjustments to that control. It also serves as the burner and circulator start relay. The L8124 has both a high limit and a low limit. The low keeps the boiler at a set temperature if you have a domestic hot water coil in the boiler. It has an adjustable differential also that should be set at 10 degrees normally. Normally an L8124 would be set at 160 for the low and 180 for the high.

    Sometimes older boilers, especially cast iron ones, need to maintain temperature or they leak between the sections at the push nipples. However, if that is the case, the boiler should be replaced as soon as possible because keeping a boiler hot 365 days a year is a huge waste of money.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  6. #6
    In the trades Dana's Avatar
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    IIRC Burnham 2s have two aquastats, one of which is the operational control, the other is a safety high-limit. The operational control on that boiler only kicks in when there is a call for heat, and the boiler temp will drop well below the low the low-limit temp. Tweaking the safety high-limit aquastat won't affect the temp, the other will. IIRC they are both located inside the slip-on panel at the front of the boiler, and if you are tweaking an external aquastat it may be an installer-applied control providing another function.

    Have you consulted the manual for your exact model & series? (Burnham 2s have been around forever, with multiple variations on the theme.)

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