ERGOMAX® - GENERAL SIZING GUIDE

The normal selection of units in terms of performance is :

E23 ===> E44 ===> E65 ===> E109           (for E23 & E45, see Special units, below)

Nomenclature: The last digit of a model number is the number of coils.
Typical uses for the various units are indicated below:
    E23: Accommodates the majority of residential applications. The E23 can handle boilers up to approximately 200,000 btu output.
    E44: Large homes with spas, smaller apartment buildings. Boilers generally in the range of 200-350,000 btu output. A single unit can handle apartment buildings up to approximately 20 units.
    E65: Hotels/motels, apartment buildings, laundries, car washes, restaurants, dairies, very large homes, etc. Can handle boilers up to 450-500,000 btu output. A single unit can handle apartment buildings up to approximately 35-40 units,
    E109: Hotels/motels, apartment buildings, laundries, car washes, restaurants, dairies, very large homes, etc. Can handle boilers up to 900-950,000 btu output. A single unit can handle apartment buildings up to approximately 85-90 units,

 

Special units:
    E24: Has the same tank size as E23, but one (1) more coil. Can be used instead of E44 where demand for hot water is "continuous" and tank size does not matter. Can handle boilers in the range of 200-350,000 btu.
    E45: Has the same tank size as E44, but one (1) more coil. Can be used instead of E65 where demand for hot water is "continuous" and tank size does not matter. Can handle boilers up to 450-500,000 btu.

 

Notes:
    1. Multiple units can be installed in parallel to handle demands that exceed the capacity of a single unit. (Use reverse return piping to equalize flow/btu through the units.)  
    2. In commercial applications consider installing two smaller units rather than one larger one to provide backup capability. For example, a building has 80 apts. so a single E109 could handle the hot water demand, but 2 E65 would provide backup.  
    3. Do not oversize. The flow of water through the coils should be kept high to ensure a high level of turbulence within the coils (eg. high velocity). (This turbulence scrubs the inside of the coils keeping them free of scale.)  
    4. ERGOMAX should be compared to units produced by other manufacturers based on performance and not on tank size.  
    5. Using a mix valve with ERGOMAX will eliminated/minimize boiler short cycling (boiler will operate more efficiently) and also provide more hot water.

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For help with your specific application contact our manufacturer's representative in your area, your  wholesaler or Group Thermo.

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