I can only guess that if you have a Suburban 6 gallon hot water heater tank that the water pump will be right with it and accessible inside. That's what i had in my 2005 Great West Van Sprinter Legend. Design wise, the nut usually does not fall far from the tree.
2015 Advanced RV Ocean One Mercedes Benz Sprinter
Previous Class Bs:
2011 Great West Van Legend Sprinter
2005 Pleasure-way Plateau TS Sprinter