Whole house humidifier, without ductwork?

I'm looking for a whole house humidifier to buy for an elderly man who will not be able to refill the jugs for the portable units.

I'm thinking like of a system similar to freezer ice makers...a water line in and the machine shuts off the water when it's done.

I am wondering if there is a whole house humidifier that is self fed for a house without central heating/cooling. It's a very old house and would cause a lot of trouble/money to be modified for the duct work.

Anyone know of one?