Firstly, its no narrower than a 14, which is the appliance type it is superceeding. The idea isnt for places with narrow streets, but areas which could do with a second appliance which is larger than a QRV but still significantly smaller than a 34 or 34p.
Size wise it is similar to the mitsi 14s not 100% sure but water is up around 1500-1600lts.
The "pumper" tag is irrevelant here, it will be designated a 14. Pumper comes from the tasfire designation, where any truck carrying BA is a pumper. Yes, it has stowage for BA.
The appliance, last i heard, will be based from birdwood while in the trial/prototype period, being taken to other brigades/groups/regions for weeks at a time for demonstrations and trials.
Yes its the same appliance from the last infralog.