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I ran into a new discussion on GScaleMad    http://www.gscalemad.co.uk/forum/index.php?showtopic=12418
where someone used two 3.3 ohm resistors in series as a warming device on the gas tank in the tender. A four cell AA battery pack (didn't say what type batteries) powers the electronic heater and can be switched on and off. It seems to me that four AAA Lithium cells should do the job.

Another contributor suggested  using heat conducting paste between the resistors and the tank (the stuff that's used when power transistors are bolted to heat sinks). I'm waiting for more details and some pictures to be posted.

Anyone have any experience in this area? Is this an idea to work on, or forget?
 
 

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Carl
A bit complex and if I recall in a prior discussion not practical.  Much easier just to pipe in steam off the boiler with a globe valve.
 

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Don't see the point. But if you want to experiment, then there is heating foil available. This is some kind of flexible film with resistive elements printed on. Used to keep electronics at a constant temp or to prevent condensation. It would spread the "heat" over a larger surface. Looks like this: http://www.carltontech.co.uk/foil-heating-elements.html

Or you could get some resistance wire and wind your own resistor around the tank. Put some polyimide tape around the tank first. This would also spread out the heat.

I would not mess with the conductive paste. It is a mess, will creep around and after some time it will be everywhere. You could use heat conductive glue however to mount the resistors to your tank.
 
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