# Firebox

File: `data/hbm/hbm/machine_config/firebox.json`. Settings load when the world opens. See [Datapack Settings](https://movblock.mov/ntm-next/26.3/wiki/settings.md) for replacement behavior.

## Fields

| Field | Meaning and default | Range |
| - | - | - |
| `base_heat` | Heat supplied by the heater while burning fuel; default `100`. | `[0, i32::MAX]` |
| `burn_time_multiplier` | Multiplier applied to fuel burn duration; default `1`. | `[0, f64::MAX]` |
| `heat_capacity` | Maximum stored heat; default `100000`. | `[0, i32::MAX]` |

## Example

```json
{
  "base_heat": 100,
  "burn_time_multiplier": 1,
  "heat_capacity": 100000
}
```