The ZVC425SP supports a Wet cleaning type which is better than most vacuum cleaners that have been available for a similar time to it. Most low maximum input power vacuums that are a similar age to it support a Dry cleaning type.
A Wet cleaning type is in fact the best supported cleaning type amongst all vacuum cleaners of a comparable type and age to the ZVC425SP.
Amongst comparable types of vacuum the worst supported cleaning type is Dry&Wet.
Other Wet vacuums currently available that you might want to consider include because of it's better review score, the VAX Powermax VRS18W[plb_2928150_price], or the Hoover SE71SZ04001[plb_3179031_price].