I first came across these pumps on the UK-based JBK forums a few years ago, when some of the UK-based home brewers started to use them for their home brew setups. At the time they were called 'solar pumps' likely due, in a large part to the fact that the shop selling them was SolarProject in the UK. Since that time similar, (or the same) pumps have become available relatively cheaply on Ebay and in Australian based shops, including Australian home brew shops, but I got two via Ebay more than a year ago.
Today it's more common to see them called a Little Brown Pump, because that is exactly what they are:
While they are not the most powerful pump, the Little Brown Pump recirculated from what is essentially the bottom of the brew-stand to the top, at a rate of 3L per min and did so without problem for an hour.
The main reason for including a return fitting and camlock at the very top of the HTL is to allow for the recirculation and easy CIP (Clean In Place) once everything is setup and running. A brew-stand is on the 'to do' list, but since it's not essential for making some beer, it's toward the end of the list. For the moment the old table-thing one of our neighbors was throwing out and a few milk-crates should do an adequate job. The milk crates are cable-tied together and to the stand so that they can't move or tip, adding an element of stability and safety.