core/homeassistant/components/aosmith/icons.json

{
  "entity": {
    "select": {
      "hot_water_plus_level": {
        "default": "mdi:water-plus"
      }
    },
    "sensor": {
      "hot_water_availability": {
        "default": "mdi:water-thermometer"
      }
    }
  }
}