On Sat, 28 Jan 2012 10:48:52 +0000, NoSpam
wrote:

The winner though is a Boots baby bottle warmer - £5 from eBay. The max
temperature was initially 50-55degC

I have a couple of those (fiver from ebay, as you said) to heat fuel
filters when running on veg oil. For bang/buck, they're excellent.