So HOW does the unit thaw out hydrants and couplings, etc. Is the FDNY the only fire department to have these units?
I know Boston has/had them..... Popular in New England where you get the snow/cold. Never seen one in action.
We have a city truck with a steamer attached to it and unthaw with steam and pour alcohol (methyl hydrate) on the frozen parts
Location: wpg
Here's a Youtube video of one operating... http://www.youtube.com/watch?v=ItcacB6rS2A