Look up "appliance repair parts" in your area. I'd say in the yellow pages, but no one seems to use an actual phone book any more. Instead of looking in the electronics market, they may just have it as a coffee maker part locally.
I can't say if they are the same or not, but possibly the warming tray has a different temp than say the boiler.
I can't say if they are the same or not, but possibly the warming tray has a different temp than say the boiler.