The Wall
Forum / Domestic Hot Water / alliance running cold
  • Post a Reply to this Thread

    alliance running cold (5 Posts)

  • bluemoon bluemoon @ 5:06 PM
    Contact this user

    alliance running cold

    I have 2 Burnham Alliance 55  piped to Apline condensing boilers. Both run cold after running a shower for 10 minutes. I understand that it maybe that I'm drawing 5gpm that the system can't keep up (as advertised) but here is my question....the water from the tank has run cold even though the supply & return pipes are too hot to hold. Why is there no heat transfer? Shouldn't the water be at least lukewarm?Seems that the tank only heats when there is no demand?
  • Zman Zman @ 5:51 PM
    Contact this user

    Questions

    Both the alpine and the burnham have high head losses. Is the circulator sized correctly? Is it piped with DHW priority?
    What is the output of the boiler during a dhw call? What is the delta t?
    Could the coil be calcified?
    Carl
  • kcopp kcopp @ 6:11 PM
    Contact this user

    I have run....

    into a "limed" coils on the Top Performers before....(same as the alliance) This was on city water. It may have not been calcium but it sure did effect heat transfer. Nice thing is that the coil is removable and you can clean it up.
  • bluemoon bluemoon @ 7:42 PM
    Contact this user

    alliance

    Both brand new
    Tried all 3 speeds on grundfos
    Piped directly off header with priority
    Supply & return both red hot
  • jonny88 jonny88 @ 9:00 AM
    Contact this user

    alliance

    you need a minimum of 1" piping and if using grundfoss use the 26-99.
  •  
Post a Reply to this Thread