I have always found that water pumps on portables only last about 3 to 6 months ( depends on how busy you are
)
I have had them from ashbys, altec, extracta, you name it, all the same.
BUT,,,,,,,,,,,,,,,,,,,,,,
I did have one last me for 2 years once !!!
It was the normal flojet 135psi sort, but it was in a machine ( ninja) with no internal tank heater fitted ?
I was using an inline heater with it.
So from this i suspect that the biggest cause of pump failure is running red hot water through them?
Also, when you strip down a damaged pump, you will see how much powder residue its got ? prochem crystal green is terrible for it.
regards
Chris
ps Did you know that the the 400psi ninja only heats the water ( in tank) to 50 deg ?
ashbys say that any hotter will knacker the pump.