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[EnergyPlus_Support] Natural gas boiler efficiency curve

Hi all, 

I am trying to model multifamily building with natural gas fired boiler. Do You have some info on boiler efficiency coefficients? As trial case i am using constant efficiency with following class
===========  ALL OBJECTS IN CLASS: CURVE:QUADRATIC ===========

    Boiler Efficiency,       !- Name
    1,                       !- Coefficient1 Constant
    0,                       !- Coefficient2 x
    0,                       !- Coefficient3 x**2
    0,                       !- Minimum Value of x
    1,                       !- Maximum Value of x
    ,                        !- Minimum Curve Output
    ,                        !- Maximum Curve Output
    Dimensionless,           !- Input Unit Type for X
    Dimensionless;           !- Output Unit Type
Boiler is roughly 50kW.

Thanks in advance. 


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