You seem happy to have your new hot water system and thats great, as for marketing it to domestic customers, imo i would not spead to much time or money, because at the end of the day it is water, they want their windows cleaned. Put it on your website for sure. comments made that how water cleans better has to be true, the only thing I find flimsy in the comments is the drying time, yes it may take a little less time to dry (reason I say this because as soon as it hits glass it is cooling, it is not a wonder product it is just warm water that goes cold very quickly.
I feel giving to much info to a domestic customers would be information overload, yes will help you in selling your service, as this is another selling point to new customers, but old customers do they really need or want to know about the system or is it you that wants to show off your new system to your customers? (please do not take that as a swipe at you it is not) I too was the same when I got my new system, and there is nothing wrong with being enthusiastic about it, and everyone would be the same.
Going off topic quickly: I myself would like to see test results on hot water against the cold system that gives a fair judgement on both just to see if it is a marketing spin by the big companies selling the systems. Results I saw did not fill me full of confidence (I think it is down to the operator)