Hi
PSA (Peugeot and Citroen) were never very good at easy external identication on the vans of what the payload of each one is. In the early days the Irish imports usually had a 600kg or 800kg sticker on the back doors.
If you are ordering a new van then you obviously order the higher payload model. It will cost a little more than the lesser payload van will. I see Citroen is using the old shape facelift Berlingo, now named the Berlingo First as it's entry model Berlingo (like the C15 was for many years) in a 600kg payload only with a 75hp derated 1.6 hdi engine. The new model Berlingo is either in 625kg payload spec for the SWB and 850kg for the LWB with the lower powered engine fitted to some 625kg models (payload on LWB just 50kgs short of the Transit Connect LWB of 900kgs).
If you are looking at second hand then you must ask the owner to specify which model he is selling if he hasn't advertised that. If he doesn't know then he must look at his vehicles log book. When we were looking for a van for my son we had to ask most sellers what payload the van was. Unfortunately most second hand vans out there are the lower payload - all British Gas vans I have seen are 800kg payload vans though, but are in blue not the preferred white.
PSA weren't any good at making it easy to identify what Hdi engine was in a C5 or a Xsara either, ie 90 or 110hp. The only way you could tell if a Citroen Picasso was a petrol or diesel model from the outside was to look at the size if the rear exhaust pipe. Diesels are bigger than petrols.
VW was much better at this with their TDi engine identification. If the Tdi badge was plain then it was a 90hp. If the letter i of Tdi was in red then it was a 110hp unit. If both the d and the i were in red then it was 130hp and if all the letters were in red then it was 150hp.
Spruce