Don't have much more to add that others have not already posted.

Over the years and through numerous power outages,I have found that either the Coleman propane 2 burner or Coleman gas stove that Byrd mentioned work great. For the propane stove, it is handy and a worthwhile investment to purchase an adapter that allows these stoves to connect directly to a 20lb propane tank or to a propane distribution tree. I also have the MSR Pocket Rocket stove and usually have 4-5 fuel cartridges on hand. This stove probably gets used the most due to it's easy setup / operation and is very fast at boiling water.

If it were a longer term (and unlikely) situation where running out of propane or other fuel might be an issue, we have this stove that is made out of a safely purged propane bottle. It holds a surprising amount of smaller wood inside and the chimney pipe has a spark arrestor in it. It is not the fastest at heating water (about 12 minutes for 1-1/2 L depending wood used) but works great for heating cans of soup, pasta, cooking eggs etc.

There is also some chimney pipe that I put together and this stove has been used to warm my friend's outfitter tent in the fall where temps were just below freezing.