Warehouse 13 is a US science fiction drama which is aired on the syfy channel in the US
It follows the exploits of two secret service agents Myka Bering and Peter Lattimer.
The show has been described as part X Files, Raiders of the lost Ark and Moonlighting all rolled into one

The main sites link to videos of Warehouse 13

Televisiononlineinfo.com
Sidereel.com
Yidio.com
Official website

I cant find any specific sites for the show that stream the episodes, what I have found are sites that are specifically setup for Warehouse 13, but they are only trying to sell you something.

You can also watch on Itunes the link for this is:

You can also watch on Amazon the link for this show is:
Warehouse 13 - Amazon