The following spare parts are available for the model number BS4D (175):
Burners
| Part name | Also known as |
| 29-99-580 - Bs4D 2 Stage Low Nox Gas Burner Assembly | |
| 3008500 - Bs4D Burner Gasket |
Controls
| Part name | Also known as |
| 3002967 - Control Box for BS1D, BS2D, BS3D and BS4D Burners | controller for BS1D, BS2D, BS3D and BS4D Burners, ignition controller for BS1D, BS2D, BS3D and BS4D Burners, electronic controller for BS1D, BS2D, BS3D and BS4D Burners, auto ignition controller for BS1D, BS2D, BS3D and BS4D Burners, main burner relay for BS1D, BS2D, BS3D and BS4D Burners |
Conversion Kits
| Part name | Also known as |
| 3001011 - BS4D LPG Conversion Kit |
Other Heater Components
| Part name | Also known as |
| 3007988 - Flame Sensor to suit BS2D, BS3D and BS4D Burners | |
| 3008932 - Spark Electrode to suit BS4D Burner | |
| 3970534 - Gas Train MBZRDLE410 for BS3D and BS4D Burners |