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Mark929
Mark929 Member Posts: 72
in Plumbing
Have an indirect water tank tied to Burnham boiler. Noticed the water in shower VERY hot...boiler has been working more (in Boston) today than normal. Had new Burnham block installed (replaced a cracked one) a month ago- wondering if boys may have tweaked a valve or something that may be feeding at a hotter rate.
Advice?

Comments

  • Jellis
    Jellis Member Posts: 228
    Hey Mark,
    We don't have enough information here to make a very accurate guess.
    Few things to check,
    what temp is the aqua stat set to? (The gray box under the Danger sticker on your indirect)

    do you have a 3-way mixing valve on top of the indirect tank?
    Intplm.STEVEusaPA
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
    Yes mixing valve, but even they have their limitiations. Hopefully your indirect isn't getting too hot. I wouldn't let it go above 150-160 if it's keeping up with demand.

    There was an error rendering this rich post.

  • jumper
    jumper Member Posts: 2,384
    anti scald safeties require redundancy. Especially when children or old folk are around. If you want to get rich package a feed forward feedback combo and get it into codes.
  • Mark929
    Mark929 Member Posts: 72
    Jellis said:

    Hey Mark,
    We don't have enough information here to make a very accurate guess.
    Few things to check,
    what temp is the aqua stat set to? (The gray box under the Danger sticker on your indirect)

    do you have a 3-way mixing valve on top of the indirect tank?

    120
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,210
    Maybe there's no check valve on that circulator and you're getting gravity flow even though the pump is off.
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    mattmia2
  • mattmia2
    mattmia2 Member Posts: 10,754
    edited December 2020
    Not putting a flow check back would line up with what changed when the boiler was replaced.

    Is there a flow check with a manual open lever/knob that was left open?
    Matt_67

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