> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/2d-building/building/hvac/space-hvac/fan-coil-unit/heating-coil.md). # Heating Coil ## Heating Coil (Electric Heating)
### Sizing Method Specify the Sizing Method by choosing between Autosize or Manual. If Manual is chosen, the user must provide all sizing parameters. ### Coil Efficiency Specify the Coil Efficiency as a user-inputted efficiency in decimal units (not percent), accounting for any loss. For electric coils, this is typically 100%. ### Capacity Specify the Capacity to set the maximum capacity of the coil in watts (W). This controlled coil will only utilize the necessary capacity to meet the control criteria, whether it's temperature or capacity controlled. ## Heating Coil (Water Heating) ### Sizing Method Specify the Sizing Method by choosing between Autosize or Manual. If Manual is selected, the user must provide all sizing parameters. ### Max. Water Flow Rate Specify the Max. Water Flow Rate to set the maximum water flow rate (m3/sec) through the coil. This field is utilized when Coil Performance Input Method is set to U Factor Times Area And Design Water Flow Rate. This field is autosizable. ### Capacity Specify the Capacity to set the maximum capacity of the coil in watts (W). This controlled coil will only utilize the needed capacity to meet the control criteria, whether it's temperature or capacity controlled. This field is autosizable. ### Inlet Air Temp Specify the Inlet Air Temp as the inlet air temperature (in degrees Celsius) corresponding to the rated heating capacity. The default is 16.6. ### Inlet Water Temp Specify the Inlet Water Temp as the inlet water temperature (in degrees Celsius) corresponding to the rated heating capacity. The default is 82.2. ### Output Air Temp. Specify the Output Air Temp as the outlet air temperature (in degrees Celsius) corresponding to the nominal heating capacity. The default is 32.2. ### Output Water Temp. Specify the Output Water Temp as the outlet water temperature (in degrees Celsius) corresponding to the rated heating capacity. The default is 71.1. ### Ratio for Air and Water Convection Specify the Ratio for Air and Water Convection as the ratio of convective heat transfers between the air side and water side of the heating coil at rated operating conditions. The default is 0.5. {% hint style="info" %} Change Only on Premium Plans. Please reach for further [support](https://app.gitbook.com/o/WS5BGzA70OvplUrfmCf1/s/fKJnzF2TwHA3APPbiCpF/~/changes/232/support-and-training/contact-us). {% endhint %} --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## 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, and the optional `goal` query parameter: ``` GET https://docs.betterbuilding.io/user-guide/2d-building/building/hvac/space-hvac/fan-coil-unit/heating-coil.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. 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.