With all this talk of water heaters I thought I may as well post what I use...I place one of these on a cinder block and then the galvanized heater on top of that. It works great!
http://www.amazon.com/gp/product/B000I8XDBM/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1
Great price ! I just wonder if it is food safe ? As it is supposed to go in a engine ?
Oh I see you put under the dish ...no problem
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