When you import gbXML files from Revit 2013 into Ecotect Analysis, you may receive the following error message:

This error is being presented because the gbXML export file that Revit 2013 produces is not encoded in a format Ecotect recognizes (and for some reason triggers this somewhat misleading IFC error message).

Unlike earlier versions, Revit 2013 exports gbXML files in the UTF-16 format, whereas Ecotect expects UTF-8.

The simplest way to fix this problem is to open the gbXML file in Windows Notepad and Save As to create a new file, changing the format (in the Encoding pull-down menu) to UTF-8.

The gbXML should then import without problem.

Revit MEP makes it easy to model greywater systems as part of your strategy for improving sustainable design and LEED certification.  You can get started by following the steps outlined in this video tutorial posted by AutodeskMEPTechs.