In reply to paul29uk: Had a whisperlite for 20years, only changed to get one with the shakerjet as this really was a great development to clear the jet.
Never had any issues with it, it just gets on with it! Difficult to simmer but not impossible, performs the same, summer or winter, unlike gas.
Should go into a one litre pot but best to take the pot to a shop to see how well.
Just my thoughts!