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dhw

ken_6
ken_6 Member Posts: 33
in THE MAIN WALL
from a fuel dollars point

why a 90% tank type such as cyclone vs 90% boiler + indierct
or visa versa?

Comments

  • Steve Eayrs
    Steve Eayrs Member Posts: 424
    dhw questions

    The cost of the boiler and indirect is definitely higher, and you would most likely not go with a boiler if not wanting to heat the house too. If you already have a boiler, then go with the indirect. The 90% you mentioned does not include, residual heat loss, standby stack loss. Eff. is higher with the combined system. As far as your other question about gph rating terms etc., there are a lot of terms to describe how much water can be produced. some are to tell what you can produce in the first hour, some for what you produce in a constant flow, and a self contained unit already has the ghp @ a certain degree rise figured out, but with a boiler/indirect the gph of hot water is also directly related to the size of your boiler, and temp. settings on it.

  • heatboy
    heatboy Member Posts: 1,468
    How about life span.......

    A great boiler and indirect will last for more than 20 years while a Cyclone, Polaris or Voyager.............well, considerably less.

    hb

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  • ken_6
    ken_6 Member Posts: 33
    dwh

    the scenario is were called in to upgrade apts
    eff. so we are replacing heating boiler with high eff anyway

    the question is from a gas bill perspective only

    a leave existing tank type dhw
    b replace with cyclone type
    c indirect off of high eff boiler
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