# Smart Home Water Heater Guide

`action.devices.types.WATERHEATER` - Water heaters are devices used to heat water. They may turn on and off and adjust water temperature.

This type indicates that the device gets the Water Heater icon and some related
synonyms and aliases.

## Device capabilities

Refer to the corresponding trait documentation for
implementation details, such as attributes and states that your service should support, and how to
build EXECUTE and QUERY responses.

### Required traits

These traits and commands are required, if applicable to your
device. If your device does not support these traits, enter the error code of
`functionNotSupported` in a QUERY or EXECUTE response. See
[Errors and exceptions](https://developers.home.google.com/cloud-to-cloud/intents/errors-exceptions) for more info.

- [`action.devices.traits.OnOff`](https://developers.home.google.com/cloud-to-cloud/traits/onoff)

### Recommended traits

These traits are recommended, if applicable to your device.
However, you are free to mix and match from all available traits to best match your existing
product functionality.

- [`action.devices.traits.TemperatureControl`](https://developers.home.google.com/cloud-to-cloud/traits/temperaturecontrol)

> [!NOTE]
> **Note:** The [TemperatureSetting](https://developers.home.google.com/cloud-to-cloud/traits/temperaturesetting) trait should not be used for a water heater. It represents ambient (room/outdoor) temperature and should not be used for controlling the temperature of a specific device. In order to control the temperature of a specific device, you must use the [TemperatureControl](https://developers.home.google.com/cloud-to-cloud/traits/temperaturecontrol) trait.

## Example device: Simple water heater

This section contains example intent payloads representing a common "Water Heater"
based on the device type and traits above. If you add or remove traits in your implementation,
modify your responses accordingly to reflect those changes.

### Sample SYNC response

Request

```
{
  "requestId": "6894439706274654512",
  "inputs": [
    {
      "intent": "action.devices.SYNC"
    }
  ]
}
```
Response

```
{
  "requestId": "6894439706274654512",
  "payload": {
    "agentUserId": "user123",
    "devices": [
      {
        "id": "123",
        "type": "action.devices.types.WATERHEATER",
        "traits": [
          "action.devices.traits.TemperatureControl",
          "action.devices.traits.OnOff"
        ],
        "name": {
          "name": "Simple water heater"
        },
        "willReportState": true,
        "attributes": {
          "temperatureRange": {
            "minThresholdCelsius": 25,
            "maxThresholdCelsius": 100
          },
          "temperatureUnitForUX": "F"
        },
        "deviceInfo": {
          "manufacturer": "smart-home-inc",
          "model": "hs1234",
          "hwVersion": "3.2",
          "swVersion": "11.4"
        }
      }
    ]
  }
}
```

### Sample QUERY response

Request

```
{
  "requestId": "6894439706274654514",
  "inputs": [
    {
      "intent": "action.devices.QUERY",
      "payload": {
        "devices": [
          {
            "id": "123"
          }
        ]
      }
    }
  ]
}
```
Response

```
{
  "requestId": "6894439706274654514",
  "payload": {
    "devices": {
      "123": {
        "status": "SUCCESS",
        "online": true,
        "on": false,
        "temperatureSetpointCelsius": 30
      }
    }
  }
}
```

### Sample EXECUTE commands

#### SetTemperature

For additional details on the command parameters,
see the [`action.devices.traits.TemperatureControl`](https://developers.home.google.com/cloud-to-cloud/traits/temperaturecontrol#action.devices.commands.settemperature) reference.
Request

```
{
  "requestId": "6894439706274654516",
  "inputs": [
    {
      "intent": "action.devices.EXECUTE",
      "payload": {
        "commands": [
          {
            "devices": [
              {
                "id": "123"
              }
            ],
            "execution": [
              {
                "command": "action.devices.commands.SetTemperature",
                "params": {
                  "temperature": 45
                }
              }
            ]
          }
        ]
      }
    }
  ]
}
```
Response

```
{
  "requestId": "6894439706274654516",
  "payload": {
    "commands": [
      {
        "ids": [
          "123"
        ],
        "status": "SUCCESS",
        "states": {
          "online": true,
          "temperatureSetpointCelsius": 45
        }
      }
    ]
  }
}
```

#### OnOff

For additional details on the command parameters,
see the [`action.devices.traits.OnOff`](https://developers.home.google.com/cloud-to-cloud/traits/onoff#action.devices.commands.onoff) reference.
Request

```
{
  "requestId": "6894439706274654518",
  "inputs": [
    {
      "intent": "action.devices.EXECUTE",
      "payload": {
        "commands": [
          {
            "devices": [
              {
                "id": "123"
              }
            ],
            "execution": [
              {
                "command": "action.devices.commands.OnOff",
                "params": {
                  "on": true
                }
              }
            ]
          }
        ]
      }
    }
  ]
}
```
Response

```
{
  "requestId": "6894439706274654518",
  "payload": {
    "commands": [
      {
        "ids": [
          "123"
        ],
        "status": "SUCCESS",
        "states": {
          "online": true,
          "on": true
        }
      }
    ]
  }
}
```

## Device ERRORS

See the full list of [errors and exceptions](https://developers.home.google.com/cloud-to-cloud/intents/errors-exceptions).