Use of an old slow cooker

Try Kenwood direct, but most of the parts suppliers say it is obsolete. You might have to buy a used one off eBay.

https://www.google.com/search?q=kenwood+a135+replacement+pot

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you don't
all cooking is done in the ceramic pot that sits in the cooker

if this is a ceramic pot in an aluminium case , then no it does not
it works by induction and any water in there will cause problems

All the ingredients in a crock-pot meal go into the ceramic pot. You don't add any water to the cooker itself. The cooker is basically just a holder for the pot and provides the heat. Any liquid goes into the pot with the rest of the goodies. The pot on many models is removable for serving and cleaning, while the base should be kept away from water (like any other electrical appliance).

If you need a manual for your cooker, you can try here for Rival brand models, here for Hamilton-Beach products, and here for West Bend. Chances are you'll find your model or one similar enough that it should clear up any questions.

Now, what's on the menu?

Never!!! You should have an Owner's Manual for this product, be sure to read it carefully. At any rate, you should "never' add anything to the metal part of your slow cooker it is designed only for ingrediants to be put in the ceramic bowl.

Never put the crock into the oven or on the stovetop. It can be placed in the microwave.

do not put water in to the metal pot. place the ceramic pot inside the housing or metal part add your meal and set to high or low depending on how long you will be away and enjoy your food.

http://www.hamiltonbeach.com/contact-us/warranty-usa.php
Comments: i also found this number for parts

1-800-851-8900 (all products except microwaves and water dispensers)

Slow cookers do not need water in the base unit to cook the food in the ceramic insert. The ceramic insert gets hot from the base and cooks the food. Here is a good guide to cooking with a slow cooker. enjoy

http://busycooks.about.com/library/print02/ncrockpot101.htm