Anyone use them ?? Is there a knack to using them?? I bought a craftex one for my Prochem Steempro as I do letting agent work and most of the time the hot water is off, I've used it today for the first time and to be honest I'm not that impressed. My old machine had a submersed heater with gave constant heat at what ever temperature that you wanted but this thing seems a bit naff, perhaps I'm using it wrong or just expecting too much, I just don`t know!! Any suggestions would be appreciated, Geoff