All domestic dishwasers, even imports, recommend a cold water connection. They ALL heat their own water, at a more cost effective rate than taking it from the hot water supply. Plus the added benifit of a cold water rinse first.
All advice is given with-out seeing the job, and hence all advice MUST be taken as advice with limited knowledge on the exact situation. NO responsibility can or will be taken. And yes, I am a licensed Plumber and Drainer with my own business in Brisbane Australia