E+ : Accumulation Buffer Water Tank With No Fuel Heater Type

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Hello EnergyPlus Community,

I am interested to simulate a very simple water tank. The task of the tank is just to store the water, with no heater_fuel_type at all. It should be just a simple piece of metals to accumulate the water and serves the SHW or space heating when is needed. Let's say a buffer water tank.

I understood that there are some objects in EnergyPlus like WaterHeater:Mixed with the characteristics as below:

WaterHeater:Mixed,
  Big Water Heater,        !- Name
  0.151,                   !- Tank Volume {m3}
  Hot Water Setpoint Temperature Schedule,  !- Setpoint Temperature Schedule Name
  5.0,                     !- Deadband Temperature Difference {deltaC}
  82.2222,                 !- Maximum Temperature Limit {C}
  CYCLE,                   !- Heater Control Type
  20000,                   !- Heater Maximum Capacity {W}
  ,                        !- Heater Minimum Capacity {W}
  ,                        !- Heater Ignition Minimum Flow Rate {m3/s}
  ,                        !- Heater Ignition Delay {s}
  ,                        !- Heater Fuel Type
  ,                        !- Heater Thermal Efficiency
  ,                        !- Part Load Factor Curve Name
  ,                        !- Off Cycle Parasitic Fuel Consumption Rate {W}
  ,                        !- Off Cycle Parasitic Fuel Type
  ,                        !- Off Cycle Parasitic Heat Fraction to Tank
  ,                        !- On Cycle Parasitic Fuel Consumption Rate {W}
  ,                        !- On Cycle Parasitic Fuel Type
  ,                        !- On Cycle Parasitic Heat Fraction to Tank
  SCHEDULE,                !- Ambient Temperature Indicator
  Hot Water Ambient Temperature Schedule,  !- Ambient Temperature Schedule Name
  ,                        !- Ambient Temperature Zone Name
  ,                        !- Ambient Temperature Outdoor Air Node Name
  5.0,                     !- Off Cycle Loss Coefficient to Ambient Temperature {W/K}
  ,                        !- Off Cycle Loss Fraction to Zone
  5.0,                     !- On Cycle Loss Coefficient to Ambient Temperature {W/K}
  ,                        !- On Cycle Loss Fraction to Zone
  ,                        !- Peak Use Flow Rate {m3/s}
  ,                        !- Use Flow Rate Fraction Schedule Name
  ,                        !- Cold Water Supply Temperature Schedule Name
  Big Water Heater Use Side Inlet Node,  !- Use Side Inlet Node Name
  Big Water Heater Use Side Outlet Node,  !- Use Side Outlet Node Name
  1.0,                     !- Use Side Effectiveness
  Big Water Heater Source Side Inlet Node,  !- Source Side Inlet Node Name
  Big Water Heater Source Side Outlet Node,  !- Source Side Outlet Node Name
  1.0,                     !- Source Side Effectiveness
  0.005,                   !- Use Side Design Flow Rate {m3/s}
  0.006;                   !- Source Side Design Flow Rate {m3/s}

I make the field for the Heater Fuel Type and Heater Thermal Efficiency empty, however, it complains and will not run. The error results are as below:

Program Version,EnergyPlus, Version 23.2.0-7636e6b3e9, YMD=2024.10.15 10:14,
  ** Severe  ** <root>[WaterHeater:Mixed][Big Water Heater] - Missing required property 'heater_fuel_type'.
  ** Severe  ** <root>[WaterHeater:Mixed][Big Water Heater] - Missing required property 'heater_thermal_efficiency'.
  ** Warning ** Version: in IDF="24.1" not the same as expected="23.2"
  **  Fatal  ** Errors occurred on processing input file. Preceding condition(s) cause termination.
  ...Summary of Errors that led to program termination:
  ..... Reference severe error count=2
  ..... Last severe error=<root>[WaterHeater:Mixed][Big Water Heater] - Missing required property 'heater_thermal_efficiency'.
  ************* Warning:  Node connection errors not checked - most system input has not been read (see previous warning).
  ************* Fatal error -- final processing.  Program exited before simulations began.  See previous error messages.
  ************* EnergyPlus Warmup Error Summary. During Warmup: 0 Warning; 0 Severe Errors.
  ************* EnergyPlus Sizing Error Summary. During Sizing: 0 Warning; 0 Severe Errors.
  ************* EnergyPlus Terminated--Fatal Error Detected ...