CHU361AWK: Is there any physical differences in this and the UL listed HU361AWK?
Yes, there are differences. The CHU361AWK is built to CSA standards and will carry the CSA mark. The HU361AWK is built to UL standards and will carry the UL mark. The CHU361AWK has a viewing window as standard. The HU361AWK does not have a view window, but is offered as a special. You must add a ``VW`` suffix (HU361AWKVW) to get it and it is UL listed, not CSA certified.