Would you prohibit your tenants from using a portable dishwasher?

[Gladys Cepeda]

My tenant who already signed a lease just got their keys yesterday and informed me that they are looking at buying a portable dishwasher for the unit. I have never heard of this but now am concerned with flooding issues. This home has been recently renovated but it is an OLD multifamily 1920... Could i prohibit them from using? Should I? Is this a liability issue? Its not on the lease....

please offer your opinion. 

Thank you!!

[Nathan Gesner]

Quote from @Gladys Cepeda:

I try to avoid dictating how someone lives. However, I will strongly warn them that any damage caused will be their responsibility. You should consider requiring renter insurance to cover any damages they cause.