You have an IM
Because we sell dry steam machines we will not openly advertise models on here so these are general comments.
For deep cleaning in a kitchen or cleaning catering equipment a machine with chemical injection makes the job much quicker and easier for tackling the "hidden" areas such as canopies etc, which get saturated with grease. The steam used in conjunction with a degreaser saves time.
You must never put any chemical in the steam boiler, machines with chemical injection have a separate tank and when required chemical is injected into the steam line. You don't always have to use the chemical facility of course and most day to day routines are fine without it.
About 80% of machines we sell into big kitchens have the chemical injection version though.