# Fan Coil Unit System (Water Heating)

A Fan Coil Unit System (Water Heating) is an HVAC configuration employing fan coils for air distribution. 

<figure><img src="/files/q56mModqxI0BviSDnsi6" alt=""><figcaption></figcaption></figure>

It utilises hot water from a central source for heating, providing energy-efficient climate control in buildings. It is comprised of:

* Condenser Water Loop
* (Optional) Air Handling Unit
* Hot Water Loop
* Chilled Water Loop
* Fan Coil Unit(s)

The 'Select HVAC Template' form provides options, to allow the user to configure the system with:

* Zone Reheat Type (Electric or Hot Water)
* Optional connection to a central Air Handling Unit (for outside air supply)
* A single AHU connected to multiple Fan Coil Units or multiple AHUs connected to multiple Fan Coil Units
* Choice of Spaces for Air Terminals

{% hint style="info" %}
Only available on Premium Plan.  Please reach out for further [support.](/support-and-training/contact-us.md)
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.betterbuilding.io/user-guide/2d-building/building/hvac/hvac-templates/fan-coil-unit-system-water-heating.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.