Washing machine - which is more economical and/or environmentally friendly?

[WilLiAmHerschel]

Asking mostly out of curiosity... (because my life is that interesting.)

A faster, hotter wash or a longer wash at a lower temperature?

I always thought a longer wash at a lower temperature was more economical. I read somewhere that's why modern machines take longer to do a wash.

A lot are cold feed only now, so I would guess that hot washes are more costly.

The manual will often say which cycles have been rated for efficiency.

I think a longer 40 degree is more economical and environmentally sound as it uses less water and less energy as it slowly heats up a smaller amount of water.

long and colder (usually) check the manual there should be a section on water and electricity use.

Thanks, that's useful to know.

My 'eco' setting washes cooler for longer. I think there is less shushing around of the clothes too?