Door hardware
The hinges which I got from the same place are quite beefy things, to support the weight of the triple glazing and the usually wide diameter of the door.
These have some variety of smooth ball bearings (probably thrust bearings), which should be most pleasingly effective and reliable. They are rated to 150kg per pair. I am thinking of having three per door ;)
Being wider than most hinges (102mm instead of he usual 75mm -see the comparison photo) they will screw into the door in the centre, rather than the edge, which would put twisting stress on the door. Apart from that, like the five point locking system the hinges are also nice and shiny stainless steel, which should not rust, or require painting, like the horrible hinges in the top of the comparison pic.