I can't say I have seen a WR outlet? Does it mean Weather Resistant? Not a Canadian Requirement. I would guess that Hospital grade may be more corrosion resistant but are not subjected to the same test procedure as WR in the product standard so maybe the HG are in fact better made but no one has paid to test them to prove it? The testing system is about proving your product meets the standard and not just promising it will like they do in Europe.
Maybe the guts of WR and HG are the same and only missing the green dot?
