Ethanol Chaffing fuel and Sterno (same thing) are notoriously difficult and time consuming to get to water to a rolling boil and for cooking, but the fuel is relatively cheap to purchase and is reasonably safe to store and use for home use inside.

So time for boiling time test of 500 ml (2 cups) of cold water using the following stove and kettle.

Stove - Wild Woodgas stove.
http://wildstoves.co.uk/wood-cooking-stoves/wood-gas-camping-stoves/wild-wood-gas-stove/

Kettle - Vango PowerEx Kettle
http://www.outdoormegastore.co.uk/vango-powerex-kettle.html

Fuel - Genheat 200gm Ethanol Chafing Fuel

Time to boil = 13 minutes for a full rolling boil. Not too bad considering typical time using a typical sterno stove is 20+ minutes