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Thinking of replacing existing pump for a Taco Bumble bee pump

Thinking of replacing existing pump for a Taco Bumble bee pump .

On my Vitodens 100 system .

Ideas ?


  • Harvey RamerHarvey Ramer Member Posts: 1,744

    Ramer Mechanical
    To learn more about this professional, click here to visit their ad in Find A Contractor.
  • delta Tdelta T Member Posts: 393
    Looks like a...

    WIlo you have installed. Very good pump, pretty much all I use. I second the question...Why? do you have any problems with system?
  • Total1Total1 Member Posts: 27
    Like the idea of the pump

    Like the idea of the pump adjusting to the boiler temperature and keeping the delta T the same .  No problems at all with the system , but the new pump would use 85 % less power and has a cool look factor .. 
  • TomTom Member Posts: 446
    and noisy

    The bumble bee is much louder than normal pumps. If thats a factor.
    Montpelier Vt
  • ChrisChris Member Posts: 3,040
    edited January 2014

    LWCO is in the wrong place though it doesn't matter because the boiler won't fire anyway if you don't make the flow switch..With the boiler needing a min flow rate of 1.7gpm across the HX and you are not piped pri/sec wouldn't recommend it unless your going to run it in a constant pressure mode.

    What's with that zone valve and the ball valve? Some sort of by-pass?
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
  • Total1Total1 Member Posts: 27

    Why is the LWCO in the wrong place ? It is the highest in the loop  , where would you put it ?  .  The zone valve / bypass is for the room / tunnel under the garage to get enough flow to start the boiler . 
  • ChrisChris Member Posts: 3,040

    That's why the boiler should have been properly piped primary secondary. Sure hope you never need more then 6.2gpm...LWCO is useless so it doesn't matter...
    "The bitter taste of a poor installation remains much longer than the sweet taste of the lowest price."
  • NYplumberNYplumber Member Posts: 472
    Dont mess

    Dont mess with a high head hx and dt. If you slow the flow too much you will loose more then you gain.
  • Total1Total1 Member Posts: 27

    With this on demand boiler , since it keeps no water warm when it shuts off , and the pump is controlled by the boiler also  , I have no need to circulate the water when it is off . The Gas inspector wanted a LWCO installed , I even quizzed him on why one is needed with the flow switch . This boiler is ONLY heating my garage , room / tunnel below the garage , and later project floor heat for the bathroom in the basement , all is good and thanks for your input . I will keep it how it is . To keep around 1100 sq ft of floor heated it averaged out to be 1 $ per day @ 60 F , even when it was -36 C .
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