core/homeassistant/components/water_heater/services.yaml

# Describes the format for available water_heater services

set_away_mode:
  description: Turn away mode on/off for water_heater device.
  fields:
    entity_id:
      description: Name(s) of entities to change.
      example: "water_heater.water_heater"
    away_mode:
      description: New value of away mode.
      example: true

set_temperature:
  description: Set target temperature of water_heater device.
  fields:
    entity_id:
      description: Name(s) of entities to change.
      example: "water_heater.water_heater"
    temperature:
      description: New target temperature for water heater.
      example: 25

set_operation_mode:
  description: Set operation mode for water_heater device.
  fields:
    entity_id:
      description: Name(s) of entities to change.
      example: "water_heater.water_heater"
    operation_mode:
      description: New value of operation mode.
      example: eco