ask daz
I think hot is a little faster on nearly every job, but it really comes into its own on filthy conny roofs or first cleans - at worst it more than covers the running costs, but if your business does a lot of cladding cleaning & conny cleaning it could make a huge difference.
which is about £100 on your prices
Its all about better working, easier cleaning etc. Not really much quicker, just more pleasant to work using it. Warm hands = happy cleaner.
Nathaniel , do you have a pic of your set up?