Oops i forgot to add my piece on water conservation and washers!
There was a time over here when manufacturers decided to start making machines save unnecessary wastage on machines, they for a few years stuck to the 65-70litre bracket, i don't know what that is in gallons for the US guys.
Now that seemed to be a good amount, the machines didn't over use water, they rinsed to a good standard too.
then in 2000, they dropped to stupid levels, and it is no coincidence that from the year 2000, skin problems in the uk rose with the decline in washing machine water usage! & that is why every machine just about on the market for years and years has had an extra rinse facility! Because it takes a certain amount of water to Rinse detergent out effectively!!!!!!!!!!
Though it appears the manufacturers know this, as machines are slowly creeping back up in water usuage.
Cold fill is great, heating in the machine the amount of water needed.
I've always gone on the line that doing full loads & using the right amount of detergent is the best way to be do things economically, as opposed to little and often!
Darren