Hot Pure water cuts through grime ect. faster than cold thus reducing the time spent on first cleans and Commercial cleans.
So in my eyes £2500 for a hot water system is a good investment in the long run.
I think they will come down to around £1500 in the years to come though, but I doubt it very much if they will fall below 1K.
on the comparison to a home boiler, hot water WFP systems are for commercial tradesmen not residential customers so the prices would be higher than that of a home boiler.
The thing with any asset is, will it make me money? if the answer is yes then buy one. if you haven't enough commercial or first cleans to warrant it then don't bother.
Matt