Umm. Do I have a submersible pump or not ?

Hi everyone. I bought a 2013 Eldiss 145 Autoquest motorhome a few weeks ago. We’ve had some good trips away. Like many owners out there I’m a bit of a tinkerer when it comes to looking after my vehicles but I’ve been unable to find an answer to an issue bugging me.

My van has an underslung exterior fresh water tank which I initially thought was powered by a whale submersible pump. However under the rear lounge seat I found a whale smart flo water pump fitted with a strainer and damper. There is no in line pressure switch which would normally indicate a submersible pump. I contacted Whale and was informed that if my water tank was made by Whale (who knows as I’ve been under to look  and it’s covered with insulation)  I might have both an external and submersible pump (why ?) and they couldn’t really help much. I’ve contacted Eldiss twice by email to ask if this model was fitted with a submersible pump but they haven’t replied. 
 
In the experience of more seasoned owners than me what is the likelihood of my van having both types of pump fitted. Does the absence of an inline pressure switch mean no submersible pump. I’m interested to know because there does not appear to be any means of accessing the water tank from within the van and if there is a submersible pump within the tank and it ever goes wrong it means dropping the tank I assume. The UV0814 smart flo pump although now obsolete appears quite simple to remove and work on and it would be great if this was the only pump I had to worry about  

i thanks fellow members in advance for any advice they can offer