Error trying to Autosize OS:WaterHeater:Mixed: Wrap WaterHeater:Sizing in OpenStudio

[DavidGoldwasser]

When I drop in a water heater it starts as 100 gallon tank volume, and a capacity of about 2,800,000 Btu/hr.

The capacity seems large, when I tried to run after changing it to autosize I get the following error. Am I doing something wrong, or is there no way to autosize this object?

** Warning ** Water heater named OS:WATERHEATER:MIXEDhas heater capacity set to AUTOSIZE but it is missing associated WaterHeater:Sizing object
** Fatal ** Errors found in water heater input. Preceding condition causes termination.

[kbenne]

No I don't think you are doing anything wrong. To be honest I didn't know there was a water heater sizing object.

[MatthewSteen]

I'm seeing this in 1.6.0 and 1.6.3.

[jmarrec]

+1 in 1.10.2

[DavidGoldwasser]

@kbenne any thoughts on this?

[kbenne]

My thought is we need to at WaterHeaterSizing, but I honestly don't have it in my queue yet.

[ckirney]

Could you remove the autosizing option from the water heater tank volume and tank capacity in the interface until you have time to fix the problem (which I think is telling EnergyPlus which of the six autosizing options to use)?