For those who like hiking and like to keep their electronic gadgets with them there are small wood fired cooking stoves that generate enough power to charge a phone and tablet. I'm wondering if there are similar devices that generate much more power. Say 1kW and up. It could be cheap way to generate electricity for people who have free wood for their wood stove.

Here's  a video about this...thermoelectric generators
https://www.youtube.com/watch?v=yxyFTIZ8jJE 
Not sure the current it would produce. 
I've got one of these, Joi light

You could burn wood in a steam engine/generator and use the waste heat. Or perhaps wood gasification and then a more conventional engine/generator.

Conceptually, it doesn't make sense to burn fuel and not generate electricity. But practical matters get in the way.

The amount of heat that it takes to get a kilowatt out at typical thermoelectric efficiencies would more than heat a leaky tent, let alone a house. You also need a large temperature difference to make it work, which requires a large heat-sink on the "cold" side too.

@stuie, that's one of the devices I saw a while ago.
Another one is the Powerpot. 5 watt output.
http://www.powerpractical.com/powerpot-v

@dana1 20% efficiency is the best I can find.
Not sure it's for sale and price if it is.
http://www.gizmag.com/most-efficient-thermoelectric-material/24210/

The newly discovered thermoelectric materials are substantially more efficient than those commercially available, but it still takes a very large temperature difference to get significant power out of them.