Being honest, i still believe hot is better than cold ( been using lpg water heater for about 5 years. )
But i dont believe its 3k better.
It does help with new cleans, gutter/fascia cleans & conny roofs ( i dont use any chemicals on these types of cleans , just hot )
I also use hot everyday on mantainance cleans i just think it helps especially on bee/fly spots & baked on bird pooh, all for a small weekly lpg cost.