woodsy I have no doubt that the hot water helps on the difficult jobs, I've seen this for myself, I;ve also seen how the hot water can actually make it harder on certain jobs where it can create more runs from the top seal. Like I've said they're not a ad systems at all, but to say they put you many steps ahead of "unprofessional" systems, what does that mean? I don't put my name on the systems I build, I don't have a marketing machine - what I do have is the complete flexibility to put machines together that suit the customer, and not make the customer suit the machine, I use better quality components (as most other mfrs do), oh did I mention the price....