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Yes, the cheap adapter I tried was 40VA (volt amps), and very insufficient for the heater.
It burned out (or blew its fuse) within a couple of minutes.

My problem is that I don't know how to...

I bought a 24v electric heater that's capable of drawing up to 10a. It's wire in a flat silicone pad. I intend to make a heated mirror with it. I have the mirror, the heater and the adhesive, but...