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DHW- direct fired or indirect?

NYplumberNYplumber Member Posts: 503
edited January 2017 in THE MAIN WALL
Hi,

I have a job that requires roughly 2.6mmbh for the showers. The current setup of tankless is undersized and in need of extensive repair.
The options are direct fired heaters with storage, or indirect (ie turbomax which i have ised with great success).
There is room for sidewall venting, however there is a chimney stack that is sufficiently sized. The intake air must be taken from outside (sealed combustion) due to the mechanical room being in close proximity to the pool chemicals.

Looking for pros and cons of each setup as well as manufactures of direct fired.

Thanks,
M
:NYplumber:

Comments

  • ZmanZman Member Posts: 5,749
    Is the 2.6mmbtu your estimate for on demand?

    Generally when you add storage you can reduce the output of the plant. Most manufactures a simple chart or an online calculator that shows the relationship. By adding storage you create a buffer to help bridge over spikes in demand so less boiler firepower is needed.

    I see some real advantages to the turbo max setup especially when the DHW system is part of a heating plant. The fact that it does not store DHW is a bonus from an anti legionella point of view.

    I would start by getting a fixture count for the building rather than using an estimate based on previously installed systems. Most manufactures have software or charts to assist with sizing.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • hot_rodhot_rod Member Posts: 13,205
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    The magic is in hydronics, and hydronics is in me
  • NYplumberNYplumber Member Posts: 503
    > @Zman said:
    > Is the 2.6mmbtu your estimate for on demand?
    >
    > Generally when you add storage you can reduce the output of the plant. Most manufactures a simple chart or an online calculator that shows the relationship. By adding storage you create a buffer to help bridge over spikes in demand so less boiler firepower is needed.
    >
    > I see some real advantages to the turbo max setup especially when the DHW system is part of a heating plant. The fact that it does not store DHW is a bonus from an anti legionella point of view.
    >
    > I would start by getting a fixture count for the building rather than using an estimate based on previously installed systems. Most manufactures have software or charts to assist with sizing.

    Thanks for commenting Zman. The calculated numbers are actual based off the showers. The building needs roughly 5000 gph on an 80 degree rise.
    :NYplumber:
  • NYplumberNYplumber Member Posts: 503
    > @hot rod said:
    > here is a good resource
    > http://lochspec.lochinvar.com/default.aspx?&PID=60956

    Thanks HR. I will take a look.
    :NYplumber:
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