Yep, still driving it
The thing about 12v pumps is that they never really put out the gpm they’re rated for. The rating is based on ‘open flow’, i.e., with no back pressure or hose on the outlet. I would guesstimate that my current pump is putting out .3-.5gpm at the brush. I should really measure it.
25 gallons can get me through the exteriors of an $800 home (price for in & out). So a full day’s work of residential if you’re solo. If the job requires more water than that, I have a couple 6 gallon jerrycans I use to supplement the tank.
I think 35-40 gallons would be the ideal size for a solo operator. If I could find a reasonably priced tank that would fit on the floor behind the front seats, I’d definitely consider upgrading.