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Tankless is gone

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clammy
clammy Member Posts: 3,112
Even on most oil fired boilers i do with a indirect i usually always install a tiple aquastat and use a priority relay for the indirect when a boiler stays warm it usually stays clean and when it's clean it's stack temp stays low it does not take much soot to lower your eff and another plus is that triple aquasta gives you circ a low limit so your boiler doesn't get shocked with cold retrun water and start to condense ,i also usually depending upon the system layout add a system by pass to inject some supply water back into the retrurn it also helps the pump from cycling on low limit also and gives your domestic a little temp to start out on instead of starting off cold ,also don't forget the check valves on your suopply and return offthe indirect stop0s migration .This is just what i do and every one has to do what they feel comfortable with i recently wnet to a clean on a boiler i installed in 2001 it was it's first clean since and the satck was only about 50 to 75 degrees higher then when it was installed peace and good luckclammy
R.A. Calmbacher L.L.C. HVAC
NJ Master HVAC Lic.
Mahwah, NJ
Specializing in steam and hydronic heating

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  • Pringles
    Pringles Member Posts: 13
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    tankless

    I recently installed a water heater to take the place of an under performing tankless. My question is what would be the most efficient settings for the aquastat now that I no longer need it to maintain temperature? I know in the summer I can simply shut off the boiler but how about the rest of the year especially spring and fall when I only need the heat to kick on once or twice a day? I do not want to change the control I just want to make the best of what I've got.......thanks
  • clammy
    clammy Member Posts: 3,112
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    how old

    how old is the boiler who tankless coil was abonded?was the boilers aquastat a triple aqaustat with a hi/low setting and a differental with low circ limit i won,t remove it if the boiler is located in a damp basement it may be better for you to maintane a 120 to 140 low limit it will keep the boiler from condensing in the summer and also some times when a older boiler goes from a warm start to a cold start there some times is issues i my self perferr a low limit on oil fired equipment it keeps it from condensating in the summer give low limit circ protection and also pervenbts soot in the boiler from becoming wet and adhering to the cast . just about ever oil fired boiler that i have seen that's 50 or more years old and still in good shape had a maintaning aquastat with a circ low limit .JMHO peace and good luck clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating
  • John@Reliable_14
    John@Reliable_14 Member Posts: 171
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    Best thing is too .............

    like clammy said, set the low between 120 - 140 degrees, high limit is standard at 180 degrees, but please don't shut it off in summer. By maintaining heat in boiler you will keep it above the dew point. Your boiler will thank you with a longer service life, plus your service person will be happy too.
  • Tom S.
    Tom S. Member Posts: 94
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    Indirect???

    What about if you have an indirect HW tank? Is the firing of the boiler in summer to keep the indirect at temperature enough or would you advocate keeping the boiler at 120 low limit as well?

    I ask b/c I am poised to move from an internal coil to an indirect and want to know what people think about how the boiler should behave.

    Thanks,

    Tom
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