You need to heat water on demand or by the time it gets heated by an element and through a hose and up a pole it will be cold,you have to have a constant flow of hot water to see the difference in cleaning.Hot water comes into it`s own this time of year,i have been 1 of the only polers working regularly these last few weeks so it`s paid for itself 10 fold in my book.If you had cold to work with for a week and had a hot system for week 2 you would only ever choose cold on price not results and the pleasure it is to work with.