Why do people think heat is an issue ...
This Airflex clearly has heat from cold .
https://www.youtube.com/watch?v=HgvS0xSeufQEven though hes using a technique to maintain it ( slow upstroke) , that isnt necessary if the water is preheated by either using an onboard immersion or feeding your tank or autofill from a warm source .
I've used an immersion coupled with an external steammate and turned the temp down a lot of the time .
The 6.6 machines are performing well no doubt , but its worth noting that two members here (Russ Chadd and Glynn ) have used a 6.6 machine and have stated that the Enforcer with its series electro motors is performing as well or better than the 6.6 machines .
The advantage with Enforcer setup is one cord for the vacs/ pump ... leaving the second cord free for an immersion or an inbuilt 3kw steammate or both on a two way switch .
I dont believe a two vac machine 6.6 or otherwise is powerfull enough to run through a large van tank ... iv tried it with a triple vac and it sucks the life out of the little vacuum you've got ... it might work well with a series /parallel quad vac .
the mytee Escape s the only proper ETM available and woodbridge seem to pricing it way too high now unless they have have come up with a sophisticated heating system thrown in .
I think a portable is best used as a portable ( unless u can pull up really close the room your cleaning for occasional van mount ) otherwise bring it to the door or window and use it from there . Even better if u have a smaller machine too (eg alltec express ) for occasional stair lifting .