We are looking to have a boat built in the next 2 years and hope to be able to have a Heritage diesel fired range cooker, twin oven/hob, fitted. Not a cheap option circa £6000, there are cheaper single oven/hob models available . Vintage also make diesel ranges. The change to Bio diesel in 2011 will affect everyone that uses diesel for whatever purpose, I don't know to what extent just yet. I am sure it will bring a fair amount of publicity in its own right. The Boatman solid fuel range is another cheaper option. I purchased a Cobb bbq this year, what a gem, oven/bbq/fryer all in one. I will be bringing it on the boat for use on the towpath/under ventilated cratch. To boil a kettle if on the move a 1 kw shouldn't be a problem depending on inverter , a suitcase generator is an option when moored to save on batteries. Solid fuel stove would boil kettle as well. Hot summers are the problem for any stove/range use. There is no one answer, it depends on your pocket and individual preference. Hope this is of some use, it is my first post so may have gone over old ground.