About 10 years back I bought a Seirus boot dryer. The lady at the ski shop told me as she rang up the sale that I would be back within a month. Seems that they had some serious warranty issues with them.She was right, I was back twice more that season to exchange the dryers. I decided at that time to exercise some of my fabrication skills and build myself an industrial duty boot dryer out of PVC tubing and a 120V muffin fan from W.W. Granger. You DO NOT need heat to dry your boots. A soft gentle movement of air with an exit is sufficient. The unit pictured below will dry a pair of boots in about 30 minutes but will hold up if it is forgotten and left on all night. The Seirus unit cost $49.95 and I have less than $40 in mine. With the PVC tubes and elbows you do not need to glue the joints and therefore you can break it down as necessary for travel or storage.
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Gotta love the bowl flange interface.
So if you ski like crap, you know where that comes from.