Am I being unreasonable?

[Traveller]

Thanks everyone for your responses

to answer a few questions (and I apologise, these are not in order)

I can't replace with a top loader as the washing machine is fitted under the kitchen benchtop
There is almost 6 months left on the lease, but these are good tenants who renew the lease every year and have been in the house for 2.5 years.
The rent they pay me is barely a scratch in the mortgage so I can't reduce it any in compensation for the smaller machine.

I think I will just offer them the new machine and if they are unhappy they have the right to buy their own. However this close to Christmas I doubt they will have the money either.

ETA Scratch that, I have found a 7kg machine only 20 pounds more and it's a good brand so I will meet her halfway and get that instead