Hi PandaMan and thank you for the comment. Regarding dimensions, on our website we give the give both the internal tank size and the stainless steel basket for every model. You are correct about how the manufacturers describe the tank sizes. However, it's the internal dimensions that are important, not the capacity (litre) of the tank. I could re-name the 3 Ltr model to "2.7 Ltr", but its still the dimensions of your particular item that need checking. Measure twice, purchase once.

Hi. Yes you can fill the cleaner with warm water from a tap or kettle (but warm, not over 80 degrees centigrade)