I've got a hotbox on order for when i come back off holiday, cracking bit of kit. They gave me a demo, I don't need it but I am buying it to see if there is an edge to heat before I invest further.
I also have a twin operator chewing gum machine and a single operator unit. I used the single operator unit last Sunday & Monday on a store front at Dartford - Kent.
I cleaned about 120 metres by 4 metres, just less than 500 m2 in a 8 hour day of heavily soiled slab. By heavily soiled I mean an average of about 25 pieces per metre. I was absolutely belting it out, completely knackered by the end.
The chewing gum removal machines I have have a lance, trigger for chemical & a brass brush to agitate the pats.
Chewing gum is hard work to remove and I am not confident that you can just remove gum by heat alone. I will let you know when I get my hotbox but I would not have wanted to tackle the job I had to do without steam @ 180 Celsius, chemical & brush to agitate.
Rob